Sub-contact portion and DC relay including the same

Abstract

A sub-contact unit and a DC relay including the same are disclosed. The sub-contact unit according to one aspect of the present invention includes a body having mutually separated spaces formed therein; and a plurality of sub-connectors housed in the spaces of the body and electrically connected to an external control power source and a core unit, and the body includes the mutually separated spaces formed therein, a plurality of legs extending in one direction, and bridges extending between the plurality of legs and connecting to each of the plurality of legs.

Description

Technical Field

[0001] The present invention relates to a sub-contact portion and a DC relay including the same, and more particularly, to a sub-contact portion having a structure capable of effectively extinguishing an arc while ensuring a sufficient insulation distance, and a DC relay including the same.

Background Art

[0002] A direct current relay is a device that uses the principle of an electromagnet to transmit mechanical drive or current signals. A DC relay is also called a magnetic switch and is generally classified as an electrical circuit opening / closing device.

[0003] A DC relay includes a fixed contact and a movable contact. The fixed contact is electrically connected to an external power source and a load. The fixed contact and the movable contact may be in contact with each other or separated from each other.

[0004] The energization through the DC relay is allowed or interrupted by the contact and separation of the fixed contact and the movable contact. The movement is achieved by a drive unit that applies a driving force to the movable contact.

[0005] When the fixed contact and the movable contact are separated, an arc is generated between the fixed contact and the movable contact. An arc is a flow of current with high voltage and high temperature. Therefore, the generated arc must be quickly discharged from the DC relay through a predetermined path.

[0006] The arc discharge path is formed by a magnet provided in the DC relay. The magnet forms a magnetic field inside the space where the fixed contact and the movable contact come into contact. The arc discharge path can be formed by the electromagnetic force generated by the formed magnetic field and the flow of current.

[0007] The fixed contact and the movable contact are provided in a semi-closed space called an arc chamber. Therefore, the arc generated when the fixed contact and the movable contact come into contact and separate is also formed inside the arc chamber. The generated arc extends in the space inside the arc chamber and is extinguished.

[0008] In addition, the DC relay includes a coil that forms a magnetic force for moving the movable contact. The coil can be energized and magnetized by an external control power source through an auxiliary contact. By the way, such an auxiliary contact is also accommodated in the internal space of the arc chamber. That is, the fixed contact, the movable contact, and the auxiliary contact are arranged in the same space.

[0009] Therefore, there is a possibility of electrical interference between the current flowing through the fixed contact and the movable contact and the control current flowing through the auxiliary contact.

[0010] Korean Registered Utility Model Publication No. 20-0168172 discloses a non-contact relay that does not require an auxiliary power source. Specifically, the prior document discloses a non-contact relay in which a power source for switching without a separate auxiliary power source can serve as an auxiliary power source.

[0011] By the way, the non-contact relay disclosed in the prior document assumes that the supplied power source is an AC power source. That is, the prior document does not present a solution for a relay using a DC power source to operate without an auxiliary power source.

[0012] Korean Registered Patent Publication No. 10-2207339 discloses a latching relay including an auxiliary contact device. Specifically, it discloses a latching relay including an actuator driven by a change in the polarity of a yoke and an auxiliary contact actuated by the operation of the actuator. The actuator is configured to operate the auxiliary contact using a separate lever.

[0013] By the way, the prior art only discloses a solution for actuating the auxiliary contact, and does not present a solution for preventing a situation where the fixed contact, the movable contact, and the auxiliary contact electrically interfere with each other.

[0014] Korean Registered Patent Publication No. 10-2099944 discloses a relay device for interrupting a DC power supply for a vehicle. Specifically, it discloses an on-off control relay device for a vehicle that operates with a mechanical contact relay and can operate in a functionally contactless form.

[0015] By the way, the prior art realizes a contactless form through a switching process, and when an auxiliary contact is actually provided, it does not present a solution for eliminating electrical interference with other contacts.

[0016] Furthermore, the prior art does not provide consideration for a solution for accommodating and stably maintaining an auxiliary contact inside an arc chamber.

Prior Art Documents

Patent Documents

[0017]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0018] The present invention is for solving the above-described problems, and an object of the present invention is to provide a sub-contact portion having a structure in which components through which a control current flows can be stably accommodated inside an arc chamber, and a DC relay including the same.

[0019] Another object of the present invention is to provide a sub-contact portion and a DC relay having a structure capable of eliminating electrical interference between a control current that energizes the component to be applied and a current that energizes a fixed contact and a movable contact.

[0020] Still another object of the present invention is to provide a sub-contact portion having a structure capable of stably maintaining a coupling state between components through which a control current flows, and a DC relay including the same.

[0021] Still another object of the present invention is to provide a sub-contact portion having a structure that is not damaged by an arc generated by a component through which a control current flows, and a DC relay including the same.

[0022] The problems of the present invention are not limited to the problems mentioned above, and still other problems not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention pertains from the following description.

Means for Solving the Problems

[0023] According to one aspect of the present invention, there is provided a body portion having spaces formed therein that are separated from each other; and a plurality of sub-connectors accommodated in the spaces of the body portion and electrically connected to an external control power source and a core portion, wherein the body portion has the spaces formed therein that are separated from each other, and a plurality of legs extending in one direction; and a bridge extending between the plurality of legs and coupled to each of the plurality of legs, and a sub-contact portion is provided.

[0024] At this time, the plurality of legs can provide a sub-contact portion, the upper ends of which are continuous with the bridge and the lower ends of which are supported by an external insulating plate.

[0025] Further, the space in the body portion is recessed in the one direction, with one side open, and includes a switch receiving portion in which a sub-switch is receivably accommodated; and a terminal receiving portion that is recessed in the one direction, with one side open, and in which the sub-connector is receivably accommodated, thereby providing a sub-contact portion.

[0026] At this time, a terminal partitioning member is included that is located in the terminal receiving portion and partitions the terminal receiving portion into a plurality of spaces, and the plurality of sub-connectors are respectively accommodated in the plurality of spaces partitioned by the terminal receiving portion, thereby providing a sub-contact portion.

[0027] Further, one side of the switch receiving portion and one side of the terminal receiving portion communicate with each other, thereby providing a sub-contact portion in which a space for receivably accommodating a sub-PCB is formed.

[0028] At this time, a sub-PCB that is combined with the sub-connector to conduct electricity; and a sub-switch that is combined with the sub-PCB to conduct electricity are included, thereby providing a sub-contact portion.

[0029] Also, a plurality of legs having a space formed therein and extending in the vertical direction; a bridge extending between the plurality of legs; a switch receiving portion defined as a part of a space recessed downward from the upper end portions of the plurality of legs and accommodating a sub-switch that conducts electricity with an external control power source and a core portion; and a terminal receiving portion defined as another part of a space recessed downward from the upper end portions of the plurality of legs, partially separated from the switch receiving portion, and accommodating a sub-connector that conducts electricity with the sub-switch are included. Above the switch receiving portion and the terminal receiving portion, they communicate with each other, thereby providing a sub-contact portion in which a space for accommodating a sub-PCB that is respectively combined with the sub-switch and the sub-connector to conduct electricity is formed.

[0030] According to another aspect of the present invention, a fixed contact for energizing an external power source or load; a movable contact provided to be movable up and down and contacting or separating from the fixed contact; an arc chamber in which a chamber space for accommodating the fixed contact and the movable contact is formed; and a core portion accommodated in the chamber space and coupled to the movable contact and a sub-contact portion for energizing an external control power source, wherein a plurality of the fixed contacts are provided and arranged to be separated from each other along one direction in the chamber space, the sub-contact portion extends along another direction forming a predetermined angle with the one direction, and one end portion and the other end portion along the another direction are formed to face each other with the fixed contact therebetween, and a plurality of sub-connectors for energizing the core portion and the external control power source are respectively accommodated at the one end portion and the other end portion of the sub-contact portion, and a DC relay is provided.

[0031] At this time, the arc chamber horizontally partially surrounds the chamber space and includes a pair of walls arranged to face each other with the chamber space therebetween; and another pair of walls horizontally partially surrounding the chamber space and arranged to face each other with the chamber space therebetween and being continuous with the pair of walls respectively, one end portion of the sub-contact portion is located adjacent to a corner where the pair of walls and the another pair of walls are continuous with each other, and the other end portion of the sub-contact portion is located adjacent to another corner where the pair of walls and the another pair of walls are continuous with each other, and a DC relay can be provided.

[0032] Also, a part of the outer surface of the one end portion contacts the corner, and a part of the outer surface of the other end portion contacts the another corner, and a DC relay can be provided.

[0033] At this time, the sub-contact portion includes a first leg forming the one end portion and extending by a predetermined height; a second leg forming the other end portion and extending by the predetermined height; and a bridge extending along the another direction between the first leg and the second leg, and a DC relay can be provided.

[0034] In addition, inside the first leg and the second leg, there are a plurality of switch receiving portions that are open on one side and recessed on the upper surfaces of the first leg and the second leg respectively to accommodate a plurality of sub-switches; a plurality of terminal receiving portions that are open on one side and recessed on the upper surfaces of the first leg and the second leg respectively to accommodate a plurality of the sub-connectors; and a plurality of spaces are respectively formed by the communication of the one sides of the plurality of switch receiving portions and the one sides of the plurality of terminal receiving portions, and the spaces accommodate a plurality of sub-PCBs that are respectively connected to the sub-switches and the sub-connectors to conduct electricity, thereby providing a DC relay.

[0035] At this time, a DC relay can be provided, which includes an insulating plate located outside the arc chamber and supporting the sub-contact portion.

[0036] In addition, the insulating plate extends in a direction toward the arc chamber and includes a holder support portion that supports one ends of the first leg and the second leg in the radial direction. The holder support portion includes at least one bent portion and is configured to support the one ends of the first leg and the second leg in a plurality of directions, thereby providing a DC relay.

[0037] At this time, a DC relay can be provided, which includes an upper frame that houses the arc chamber, the insulating plate, and the sub-contact portion; and a lower frame that is coupled to the upper frame and houses the core portion in a vertically movable manner.

[0038] In addition, the chamber space can be formed to have a cross-section in a shape of a quadrilateral with the one direction and the other direction being diagonal directions respectively, thereby providing a DC relay.

[0039] At this time, the chamber space can provide a DC relay, which is formed in a rhombus shape in cross section, and the extended length of one diagonal line along the one direction is less than or equal to the extended length of the other diagonal line along the other direction.

[0040] In addition, one end portion and the other end portion of the sub-contact portion are formed to have a predetermined height, and the arc chamber can provide a DC relay, which is formed such that one side is closed along the height direction of one end portion and the other end portion of the sub-contact portion and covers the one end portion and the other end portion of the sub-contact portion.

Advantages of the Invention

[0041] With the above configuration, the sub-contact portion according to the embodiment of the present invention and the DC relay including the same can stably accommodate the components through which the control current flows inside the arc chamber.

[0042] First, the sub-contact portion forms a body portion that forms its body. The body portion includes a first leg extending in the vertical direction, a second leg, and a bridge extending between the first leg and the second leg. The lower end portions of the first leg and the second leg extend below the arc chamber, that is, to the open space.

[0043] An insulating plate is provided below the arc chamber. The lower end portions of the first leg and the second leg are supported by the insulating plate. The insulating plate has a holder support portion extending at least partially surrounding the lower end portions of the first leg and the second leg.

[0044] In one embodiment, the holder support portion includes at least one bent portion and can support the lower end portions of the first leg and the second leg in two or more directions.

[0045] Furthermore, in one embodiment, the outer surfaces of the first leg and the second leg may be arranged to contact respectively at the corners surrounding the chamber space of the arc chamber. In the said embodiment, the first leg and the second leg are supported at a plurality of points by the holder support part and the respective corners of the arc chamber.

[0046] Thereby, each component of the sub-contact part through which the control current is energized can be stably maintained in the internal space of the arc chamber.

[0047] Also, with the said configuration, the sub-contact part according to the embodiment of the present invention and the DC relay including the same can eliminate the electrical interference between the control current energized to the sub-contact part and the current energized to the main contact part.

[0048] First, the sub-PCB, the sub-connector, and the sub-switch that are energized with an external control power source are housed in the spaces formed inside the first leg and the second leg. The first leg and the second leg are arranged adjacent to the opposing corners of the arc chamber. Thereby, the first leg and the second leg are arranged at the maximum distance from the fixed contact and the movable contact.

[0049] A plurality of fixed contacts may be provided and arranged at intervals along one direction. At this time, the said one direction may be the same as the extending direction of the movable contact. Also, the first leg and the second leg may be arranged at intervals along another direction different from the said one direction. In one embodiment, the said one direction and the said another direction may be orthogonal.

[0050] Thereby, the components of the sub-contact part housed in the first leg and the second leg respectively and the components of the main contact part are separated at the maximum distance, and a sufficient insulation distance can be ensured. As a result, the electrical interference between the main contact part and the sub-contact part can be eliminated.

[0051] Moreover, with the above configuration, the sub-contact portion according to the embodiment of the present invention and the DC relay including the same are not damaged by the arcs generated by the respective components of the sub-contact portion.

[0052] First, the sub-PCB, sub-connector, and sub-switch that are energized with an external control power source are housed in the space formed inside the first leg and the second leg. The connector receiving portion and the switch receiving portion in which the sub-connector and the sub-switch are housed are physically separated, and the upper portions thereof communicate partially.

[0053] The sub-PCB that is coupled to and energized with the sub-connector and the sub-switch is housed in the upper portion where the connector receiving portion and the switch receiving portion communicate.

[0054] In one embodiment, the first leg and the second leg can extend until their upper end portions contact the upper surface of the arc chamber. That is, the sub-PCB, sub-connector, and sub-switch housed inside the first leg and the second leg are covered by the upper surface of the arc chamber and are not arbitrarily exposed to the chamber space.

[0055] Therefore, even if an arc is generated in the chamber space, the amount of arc reaching the sub-PCB, sub-connector, and sub-switch can be minimized. As a result, each component of the sub-contact portion that is energized with an external control power source is not damaged by the arc.

[0056] The effects of the present invention are not limited to the above-described effects, and it should be understood that the effects include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

Brief Description of the Drawings

[0057]

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Embodiments for Carrying Out the Invention

[0058] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement them. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention, parts not related to the description in the drawings are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0059] The words and terms used in this specification and claims should not be construed in a limited sense according to their ordinary or dictionary meanings, but should be construed in a meaning and concept that conforms to the technical idea of the present invention according to the principle that the inventor can define the terms and concepts in order to best explain his invention.

[0060] Therefore, the embodiments described in this specification and the configurations shown in the drawings correspond to a preferred embodiment of the present invention and do not represent all of the technical ideas of the present invention. Therefore, there may be various equivalents and modifications that replace this at the time of filing of the present invention.

[0061] In the following description, in order to clarify the features of the present invention, the description of some components may be omitted.

[0062] The term "energization" used in the following description means that two or more members are connected so as to be able to transmit an electrical signal or current. In one embodiment, the energization may be formed in a wired form by a wire member or the like, or in a wireless form by RFID, Bluetooth, Wi-Fi, or the like.

[0063] The term "communication" used in the following description means that two or more members are connected so as to be fluidly connectable to each other. In one embodiment, the communication may be formed by a space formed inside the two or more members. Optionally, the communication may be formed by a member such as a pipe, pipeline, hose, or the like.

[0064] The terms "above", "below", "front side", "rear side", "left side" and "right side" used in the following description are understood with reference to the coordinate system shown in the accompanying drawings.

[0065] Referring to FIGS. 1 to 20, a DC relay 10 according to an embodiment of the present invention is shown.

[0066] The DC relay 10 according to an embodiment of the present invention can secure sufficient space to extinguish the arc generated when the DC power supply is energized or cut off through the shape of the arc chamber 500.

[0067] In addition, the sub-contact portion 400 and the main contact portion 300 to which the power supply for the operation of the DC relay 10 is applied are sufficiently separated to secure a distance for insulation.

[0068] Furthermore, the arrangement structure of the magnet and the direction of the magnetic field formed thereby are diversified, and the movement path of the arc generated when the DC power supply is energized or cut off can be diversified.

[0069] In the illustrated embodiment, the DC relay 10 includes a frame 100, a core portion 200, a main contact portion 300, a sub-contact portion 400, an arc chamber 500, a terminal portion 600, and an arc guiding portion 700.

[0070] The frame 100 forms the outer shape of the DC relay 10. A space is formed inside the frame 100, and various components of the DC relay 10 can be mounted. In the illustrated embodiment, the core portion 200, the main contact portion 300, the sub-contact portion 400, the arc chamber 500, the terminal portion 600, and the arc guiding portion 700 are accommodated in the internal space of the frame 100.

[0071] Some of the components may be arranged to be exposed outside the frame 100. Specifically, the fixed contact 310 of the main contact portion 300, the main terminal 610 of the terminal portion 600, etc. are exposed outside the frame 100.

[0072] The internal space of the frame 100 is energized to the outside. The main terminal 610 and the main contact portion 300 energized thereto can be respectively energized to an external power supply and a load by a separate conductor member (not shown) or the like. In addition, the sub-contact portion 400 that applies current to the coil 250 and moves the movable core 220 is energized to an external power supply by the conductor member W.

[0073] The internal space of the frame 100 communicates with the outside. When the fixed contact 310 and the movable contact 320 come into contact or separate, the arc generated can be extinguished and discharged to the outside.

[0074] The frame 100 may be formed of an insulating material. This is to prevent the current applied during the operation of the DC relay 10 from leaking to the outside arbitrarily. Also, the frame 100 may be formed of a material with high rigidity. This is to prevent damage caused by the external environment where the DC relay 10 is installed and the arc generated inside. In one embodiment, the frame 100 may be formed of a synthetic resin material such as reinforced plastic.

[0075] The frame 100 forms the outer shape of the DC relay 10 and may be formed in any form capable of mounting various components inside. In the illustrated embodiment, the upper part of the frame 100 has a circular cross-section and is in a cylindrical shape extending in the vertical direction. Also, the lower part of the frame 100 is formed such that it has a circular cross-section at the upper part and a square cross-section at the lower part along its height direction.

[0076] In the embodiment shown in FIG. 7, the frame 100 includes an upper frame 110, a lower frame 120, a PCB frame 130, a support plate 140, and a first insulating plate 150.

[0077] The upper frame 110 forms a part of the frame 100 in the height direction and forms the upper part in the illustrated embodiment. The upper frame 110 is coupled to the lower frame 120. In one embodiment, the upper frame 110 can be detachably coupled to the lower frame 120. In the above embodiment, the space formed inside the upper frame 110 and the lower frame 120 can be easily opened, facilitating maintenance.

[0078] The upper frame 110 is formed to have a predetermined shape. In the illustrated embodiment, the upper frame 110 has a circular cross-section and is in a cylindrical shape with a vertical height.

[0079] In the DC relay 10 according to an embodiment of the present invention, while maintaining the shape of the upper frame 110 as a cylindrical shape, the shape of the arc chamber 500 can be deformed to achieve various effects. A detailed description thereof will be given later.

[0080] In the illustrated embodiment, the upper frame 110 includes an upper space 111, a coupling protrusion 112, a support protrusion 113, an upper opening 114, and an upper separation wall 115.

[0081] The upper space 111 is a space formed inside the upper frame 110. A part of the components of the DC relay 10 may be accommodated in the upper space 111. In the illustrated embodiment, the main contact part 300, the sub-contact part 400, the arc chamber 500, the terminal part 600, and the arc induction part 700 are accommodated in the upper space 111.

[0082] The upper space 111 communicates with the outside. The arc generated inside the arc chamber 500 can be extinguished and discharged to the outside.

[0083] The upper space 111 is energized with the outside. The fixed contact 310 of the main contact part 300 can be energized with the outside by the main terminal 610 that is energized with this. Also, as described above, the sub-contact part 400 can be energized with the outside by the wire member W.

[0084] The upper space 111 communicates partially with the lower space 121. Specifically, the upper space 111 is physically partitioned by the support plate 140 and the first insulating plate 150. At this time, the shaft 360 is accommodated in the hollow formed inside the support plate 140 and the first insulating plate 150 so as to be able to move up and down, and it can be said that the upper space 111 communicates partially with the lower space 121.

[0085] The upper space 111 may be formed in a shape corresponding to the shape of the upper frame 110. In the illustrated embodiment, the upper frame 110 has a cylindrical shape, and the upper space 111 formed therein may also be a cylindrical space having a circular cross section and a height in the vertical direction.

[0086] On the outer peripheral surface of the upper frame 110 surrounding the upper space 111 from the radially outer side, a coupling protrusion 112 and a support protrusion 113 are provided.

[0087] The coupling protrusion 112 and the support protrusion 113 are portions where the upper frame 110 is detachably coupled to the lower frame 120. The coupling protrusion 112 and the support protrusion 113 are located on the outer peripheral surface of the upper frame 110. The coupling protrusion 112 and the support protrusion 113 are provided at the corners extending downward in the direction toward the lower frame 120, in the illustrated embodiment.

[0088] The coupling protrusion 112 is detachably coupled to a coupling groove 122 provided in the lower frame 120. As can be understood from the name, the coupling protrusion 112 is formed to protrude and can be fitted or snap-coupled to the coupling groove 122. In the illustrated embodiment, the coupling protrusion 112 protrudes in the radially outer direction and extends along the outer peripheral direction of the upper frame 110 for a predetermined length.

[0089] A plurality of coupling protrusions 112 may be provided. The plurality of coupling protrusions 112 may be arranged at intervals along the outer peripheral direction of the upper frame 110. In the embodiment shown in FIG. 7, two coupling protrusions 112 are provided and arranged at intervals along the outer peripheral direction of the upper frame 110.

[0090] A plurality of pairs of coupling protrusions 112 may be provided. The plurality of pairs of coupling protrusions 112 may be arranged at intervals along the outer peripheral direction of the upper frame 110. In the embodiment shown in FIG. 7, two pairs of coupling protrusions 112 are provided and arranged at intervals along the outer peripheral direction of the upper frame 110.

[0091] In one embodiment, each pair of coupling protrusions 112 may be arranged to form a predetermined angle with respect to the center of the upper frame 110. In the illustrated embodiment, the predetermined angle is 180°.

[0092] Support protrusions 113 are located between each pair of coupling protrusions 112 along the outer peripheral direction of the upper frame 110.

[0093] The support protrusion 113 is a portion where the upper frame 110 is coupled to the support plate 140. The support protrusion 113 is removably coupled to a support groove 141 formed in the support plate 140. As can be understood from the name, the support protrusion 113 is formed to have a predetermined shape and can be snap-coupled to the support groove 141.

[0094] That is, in the illustrated embodiment, the support protrusion 113 is formed such that the cross-sectional area in the direction toward the lower frame 120 is smaller than the cross-sectional area in the direction opposite to the lower frame 120. The outer peripheral surface of the support protrusion 113 may extend so as to be inclined radially outward along the direction opposite to the lower frame 120.

[0095] A plurality of support protrusions 113 may be provided. The plurality of support protrusions 113 may be arranged to be spaced apart from each other along the outer peripheral direction of the upper frame 110. In the embodiment shown in FIG. 7, two support protrusions 113 are provided and are arranged to be spaced apart from each other along the outer peripheral direction of the upper frame 110. At this time, the support protrusions 113 may be arranged to face each other with the upper space 111 therebetween.

[0096] In the above embodiment, the plurality of support protrusions 113 may be arranged to form a predetermined angle with respect to the center of the upper frame 110. In the illustrated embodiment, the predetermined angle is 180°.

[0097] That is, in the illustrated embodiment, the coupling protrusions 112 and the support protrusions 113 are alternately arranged along the outer periphery of the upper frame 110.

[0098] The upper opening 114 is the portion where the upper space 111 communicates with the outside. The upper opening 114 is formed through one surface of the upper frame 110 that surrounds the upper space 111. In the illustrated embodiment, the upper opening 114 is formed through the upper surface of the upper frame 110.

[0099] A plurality of upper openings 114 may be formed. A plurality of fixed contacts 310 can penetrate and be coupled to the plurality of upper openings 114 respectively. In the illustrated embodiment, two upper openings 114 are provided, and the first fixed contact 311 and the second fixed contact 312 penetrate and are coupled thereto respectively.

[0100] The upper opening 114 can be of any shape that allows the upper space 111 to communicate with the outside and enables the fixed contact 310 to penetrate and be coupled. In the illustrated embodiment, the upper opening 114 is a disc-shaped space having a circular cross-section and a thickness in the vertical direction.

[0101] An upper separation wall 115 is provided between the plurality of upper openings 114.

[0102] The upper separation wall 115 physically partitions the plurality of upper openings 114 and blocks the energization between the fixed contacts 310 accommodated in each upper opening 114 and the main terminals 610 that are energized to the fixed contacts 310 respectively.

[0103] The upper separation wall 115 may extend in one direction. In the illustrated embodiment, the upper separation wall 115 extends in the front-rear direction and is located between the plurality of upper openings 114 that are spaced apart in the left-right direction.

[0104] The upper separation wall 115 may be formed to have a predetermined height, that is, a length in the vertical direction in the illustrated embodiment. The height of the upper separation wall 115 can be any height that can electrically isolate the first main terminal 611 and the second main terminal 612.

[0105] The lower frame 120 forms the remaining part of the frame 100 in the height direction and forms the lower part in the illustrated embodiment. The lower frame 120 is coupled to the upper frame 110. In one embodiment, the lower frame 120 can be detachably coupled to the upper frame 110.

[0106] The lower frame 120 is formed to have a predetermined shape. In the illustrated embodiment, the lower frame 120 has a circular cross-section and a cylindrical shape with a height in the vertical direction such that one side facing the upper frame 110, i.e., the upper side, corresponds to the shape of the cross-section of the upper frame 110.

[0107] Also, in the illustrated embodiment, the other side of the lower frame 120 opposite to the upper frame 110, i.e., the lower side, has a square cross-section and a shape of a square prism with a height in the vertical direction. In the above embodiment, the length of one side of the lower cross-section of the lower frame 120 may be the same as the diameter of the upper cross-section of the lower frame 120.

[0108] Therefore, the lower part of the lower frame 120 is formed to have a larger cross-sectional area than the upper part, and can stably support the DC relay 10.

[0109] In the illustrated embodiment, the lower frame 120 includes a lower space 121, a coupling groove 122, and a PCB receiving part 123.

[0110] The lower space 121 is a space formed inside the lower frame 120. A remaining part of the components of the DC relay 10 may be accommodated in the lower space 121. In the illustrated embodiment, a part of the core part 200 and the main contact part 300 are accommodated in the lower space 121.

[0111] The lower space 121 is energized with the outside. The coil 250 of the core part 200 can transmit a current for forming a magnetic field from the sub-contact part 400.

[0112] The lower space 121 communicates with the upper space 111 partially. The shaft 360 of the main contact portion 300 may be partially accommodated in the lower space 121 and the upper space 111 respectively and may be provided so as to be movable up and down.

[0113] The lower space 121 may be formed in a shape corresponding to the shape of the lower frame 120. In the illustrated embodiment, the upper portion of the lower frame 120 is cylindrical, and the lower space 121 formed therein may also be a cylindrical space having a circular cross section and a height in the vertical direction.

[0114] A coupling groove 122 is formed on the outer peripheral surface of the lower frame 120 surrounding the lower space 121 from the radially outer side.

[0115] The coupling groove 122 is a portion where the lower frame 120 is detachably coupled to the upper frame 110. The coupling groove 122 is formed on the outer peripheral surface of the lower frame 120. In the illustrated embodiment, the coupling groove 122 is located offset to the upper side of the lower frame 120, that is, one side facing the upper frame 110.

[0116] As can be understood from the name, the coupling groove 122 may be recessed or formed through, and the coupling protrusion 112 may be detachably accommodated therein. As described above, the coupling protrusion 112 can be fitted and coupled or snap-coupled to the coupling groove 122.

[0117] The coupling groove 122 may be formed to correspond to the shape of the coupling protrusion 112. In the illustrated embodiment, when the coupling protrusion 112 extends along the outer peripheral direction of the upper frame 110, the coupling groove 122 may also extend along the outer peripheral direction of the lower frame 120.

[0118] The coupling groove 122 may be formed to correspond to the number of the coupling protrusions 112. In the illustrated embodiment, two coupling protrusions 112 are provided and arranged spaced apart along the outer peripheral direction of the upper frame 110, and two coupling grooves 122 may also be formed and arranged spaced apart along the outer peripheral direction of the lower frame 120.

[0119] The coupling grooves 122 may be provided in a plurality of pairs. The plurality of pairs of coupling grooves 122 may be arranged according to the arrangement method of the plurality of pairs of coupling protrusions 112. In the embodiment shown in FIG. 7, two pairs of coupling grooves 122 are provided and are arranged at intervals along the outer peripheral direction of the lower frame 120.

[0120] At this time, each pair of coupling grooves 122 may be arranged to form a predetermined angle with respect to the center of the lower frame 120. In the illustrated embodiment, the predetermined angle is 180°.

[0121] On one side of the lower frame 120 opposite to the upper frame 110, a PCB receiving portion 123 is formed below in the illustrated embodiment.

[0122] The PCB receiving portion 123 is a space for accommodating a PCB 131 provided for controlling the DC relay 10. The PCB receiving portion 123 is connected to be energizable with the outside, and a current and an electrical control signal for controlling the PCB 131 may be input.

[0123] Also, the PCB receiving portion 123 is physically separated from the lower space 121. That is, in the illustrated embodiment, the PCB receiving portion 123 is physically separated from the lower space 121 by a surface surrounding the lower space 121 from below.

[0124] The PCB receiving portion 123 can have any shape capable of accommodating the PCB frame 130. In the illustrated embodiment, the PCB receiving portion 123 is formed to have a rectangular cross-section in which the length of a pair of sides extending in one direction is longer than the length of a pair of sides extending in the other direction.

[0125] The PCB receiving portion 123 may be closed by the PCB frame 130.

[0126] The PCB frame 130 is coupled to the lower frame 120 and stably supports the PCB 131. The PCB frame 130 is received in the PCB receiving portion 123 of the lower frame 120. In one embodiment, the PCB frame 130 can be detachably coupled to the PCB receiving portion 123.

[0127] The PCB frame 130 can be of any shape that can be coupled to the PCB receiving portion 123 and support the PCB 131. In the illustrated embodiment, the PCB frame 130 is formed to have a rectangular cross-section in which the extended lengths of a pair of opposing surfaces are longer than the lengths of the other pair of surfaces. The shape of the PCB frame 130 can be changed according to the shapes of the PCB receiving portion 123 and the PCB 131.

[0128] A plurality of through-holes may be formed inside the PCB frame 130. Ribs extend between the plurality of through-holes, and the PCB 131 can be stably supported.

[0129] The PCB 131 is received inside the PCB frame 130. One surface of the PCB 131 facing the upper frame 110, the upper surface in the illustrated embodiment, is surrounded by the surface that surrounds the PCB receiving portion 123 from above. The other surface of the PCB 131 on the side opposite to the upper frame 110, the lower surface in the illustrated embodiment, is surrounded by the PCB frame 130.

[0130] The PCB 131 is energized with other components. In one embodiment, the PCB 131 can be energized with the main contact portion 300.

[0131] The process of controlling other components of the DC relay 10 by the PCB 131 is a well-known technique, so detailed description is omitted.

[0132] The support plate 140 is coupled to the upper frame 110 and the lower frame 120 respectively, and physically separates the upper space 111 and the lower space 121. At this time, a support through hole 142 is formed through the inside of the support plate 140, which functions as a passage for raising and lowering the shaft 360.

[0133] The support plate 140 can be coupled to the upper frame 110 and the lower frame 120 respectively, and can have any shape that can form the DC relay 10. In the illustrated embodiment, the support plate 140 includes a pair of linear corners facing each other and another pair of corners that extend to be rounded from each end of the pair of corners.

[0134] As can be seen from the name, the support plate 140 is provided in a plate shape with a predetermined thickness. As a result, the size of the space occupied by the support plate 140 inside the DC relay 10 can be reduced.

[0135] In the embodiment shown in FIGS. 2 and 3, the support plate 140 is accommodated in the lower space 121. Above the support plate 140, a first insulating plate 150, a main contact portion 300, a sub-contact portion 400, an arc chamber 500, a terminal portion 600, and an arc induction portion 700 are located. Below the support plate 140, a core portion 200 is located.

[0136] In the illustrated embodiment, the support plate 140 includes a support groove 141 and a support through hole 142.

[0137] The support groove 141 is a space in which the support protrusion 113 of the upper frame 110 is accommodated. The support protrusion 113 can be detachably coupled to the support groove 141. In one embodiment, as described above, the support protrusion 113 can be snap-coupled to the support groove 141.

[0138] The support groove 141 may be formed in a shape corresponding to the shape of the support protrusion 113. In the illustrated embodiment, the support groove 141 extends in the front-rear direction and is formed to penetrate in the up-down direction.

[0139] A plurality of support grooves 141 may be formed. The plurality of support grooves 141 may be arranged at different positions of the support plate 140. In the illustrated embodiment, the plurality of support grooves 141 are arranged adjacent to the other pair of corners. The arrangement method of the support grooves 141 can be changed according to the arrangement method of the support protrusions 113.

[0140] The support through hole 142 is a hollow formed inside the support plate 140. The support through hole 142 is formed to penetrate in the thickness direction of the support plate 140, in the up and down direction in the illustrated embodiment. The shaft 360 of the main contact portion 300 penetrates and is coupled to the support through hole 142 in a vertically movable manner.

[0141] The support through hole 142 can be of any shape that allows the shaft 360 to be coupled in a vertically movable manner. In the illustrated embodiment, the shaft 360 has a circular cross-section and is in the shape of a cylinder extending in the up and down direction, and the support through hole 142 is also formed to have a circular cross-section. In the above embodiment, the center of the support through hole 142 may be formed to have the same central axis as the centers of the holder through hole 152, the core portion 200, the shaft 360, etc.

[0142] A first insulating plate 150 is laminated above the support plate 140.

[0143] The first insulating plate 150 physically and electrically separates the upper space 111 and the lower space 121. The components accommodated in the upper space 111 and the components accommodated in the lower space 121 do not electrically affect each other due to the first insulating plate 150.

[0144] The first insulating plate 150 is laminated on the support plate 140. In the embodiments shown in FIGS. 2 and 3, the first insulating plate 150 is accommodated in the lower space 121. Above the first insulating plate 150, the main contact portion 300, the sub-contact portion 400, the arc chamber 500, the terminal portion 600, and the arc induction portion 700 are located. Below the first insulating plate 150, the support plate 140 and the core portion 200 are located.

[0145] The first insulating plate 150 may be formed of any material that can physically separate the upper space 111 and the lower space 121. In one embodiment, the first insulating plate 150 may be formed of a rubber or ceramic material.

[0146] In the illustrated embodiment, the first insulating plate 150 includes a holder support portion 151 and a holder through hole 152.

[0147] The holder support portion 151 supports the contact holder 401 of the sub-contact portion 400. As will be described later, the contact holder 401 is accommodated inside the arc chamber 500 and extends toward the lower frame 120. The holder support portion 151 supports the body portion 410 of the contact holder 401, specifically, the first leg 411 and the second leg 412, and prevents any swinging of the contact holder 401.

[0148] The holder support portion 151 may include a space for accommodating the first leg 411 and the second leg 412 and a partition wall surrounding the space. In the illustrated embodiment, the holder support portion 151 includes a space with one side open toward the radially outer side and a partition wall surrounding the space from a plurality of other sides toward the radially inner side. The partition wall can extend by a height sufficient to stably support the first leg 411 and the second leg 412.

[0149] Therefore, when an impact occurs together with an arc, the first leg 411 and the second leg 412 can move a predetermined distance radially outward to buffer the impact. Further, when no arc occurs, the first leg 411 and the second leg 412 can be stably supported by the partition wall.

[0150] A plurality of holder support portions 151 may be provided. The plurality of holder support portions 151 are arranged at different positions and can accommodate and support the first leg 411 and the second leg 412, respectively. In the illustrated embodiment, two holder support portions 151 are provided and are located on the front side and the rear side, respectively. In the above embodiment, the two holder support portions 151 may be arranged to face each other with the holder through hole 152 therebetween.

[0151] The holder through hole 152 is a hollow formed inside the first insulating plate 150. The holder through hole 152 is formed to penetrate in the thickness direction of the first insulating plate 150, in the vertical direction in the illustrated embodiment. The shaft 360 of the main contact portion 300 is vertically movably penetrated and coupled to the holder through hole 152.

[0152] The holder through hole 152 can be of any shape that allows the shaft 360 to be vertically movably coupled. In the illustrated embodiment, the holder through hole 152 is formed to have a circular cross section similar to that of the shaft 360. As described above, in the above embodiment, the center of the holder through hole 152 may be formed to have a central axis such as the support through hole 142, the core portion 200, and the shaft 360.

[0153] The core portion 200 is energized with the sub-contact portion 400 and moves up and down inside the DC relay 10. Due to the up and down movement of the core portion 200, the movable contact 320 of the main contact portion 300 also moves up and down together, and the main contact portion 300 can be energized with an external power source and load.

[0154] The core part 200 is housed in the internal space of the frame 100. Specifically, the core part 200 is housed in the lower space 121 in a vertically movable manner.

[0155] The core part 200 is energized with the outside. Specifically, the core part 200 is energized with an external control power source (not shown) via the sub-contact part 400 and the wire member W. The core part 200 can operate by the control signal and current applied from the external control power source (not shown).

[0156] The core part 200 is connected to the main contact part 300. As the core part 200 moves up and down, the shaft 360 of the main contact part 300 and the movable contact 320 coupled thereto both move up and down, and the movable contact 320 and the fixed contact 310 can be energized. Thereby, the DC relay 10 can be energized with an external power source and load.

[0157] In the embodiment shown in FIG. 8, the core part 200 includes a fixed core 210, a movable core 220, a yoke 230, a bobbin 240, a coil 250, a core spring 260, a yoke ring 270, and a cylinder 280.

[0158] The fixed core 210 is magnetized by the magnetic field generated by the coil 250 and generates an electromagnetic attraction force. By the electromagnetic attraction force, the movable core 220 moves toward the fixed core 210 (in the upward direction in FIGS. 2 and 3).

[0159] The fixed core 210 does not move. That is, the fixed core 210 is fixedly coupled to the support plate 140 and the cylinder 280.

[0160] The fixed core 210 may be provided in any form that can be magnetized by a magnetic field and generate an electromagnetic force. In one embodiment, the fixed core 210 may be provided with a permanent magnet or an electromagnet or the like.

[0161] The fixed core 210 is partially accommodated in the upper space inside the cylinder 280. Also, the outer periphery of the fixed core 210 contacts the inner periphery of the cylinder 280.

[0162] The fixed core 210 is located between the support plate 140 and the movable core 220.

[0163] A through hole (not shown) is formed in the central portion of the fixed core 210. A shaft 360 is penetratingly coupled to the through hole (not shown) so as to be vertically movable.

[0164] The fixed core 210 is positioned so as to be separated from the movable core 220 by a predetermined distance. Therefore, the distance that the movable core 220 can move toward the fixed core 210 can be limited to the predetermined distance. From this, the predetermined distance can be defined as the "moving distance of the movable core 220".

[0165] One end of the core spring 260, the upper end in the illustrated embodiment, contacts below the fixed core 210. When the fixed core 210 is magnetized and the movable core 220 moves upward, the core spring 260 is compressed and the restoring force is stored.

[0166] Thereby, when the application of the control power supply is released and the magnetization of the fixed core 210 is completed, the movable core 220 can return further downward by the restoring force.

[0167] When the control power supply is applied, the movable core 220 moves toward the fixed core 210 by the electromagnetic attraction generated by the fixed core 210.

[0168] Due to the movement of the movable core 220, the shaft 360 coupled to the movable core 220 moves upward in the direction toward the fixed core 210, upward in the illustrated embodiment. Also, as the shaft 360 moves, the movable contact 320 coupled to the shaft 360 moves upward.

[0169] As a result, the fixed contact 310 and the movable contact 320 come into contact, and the DC relay 10 can be energized with an external power source or load.

[0170] The movable core 220 may be provided in any form that can receive the attracting force due to electromagnetic force. In one embodiment, the movable core 220 may be formed of a magnetic material, or provided with a permanent magnet or an electromagnet, etc.

[0171] The movable core 220 is accommodated inside the cylinder 280. Also, the movable core 220 can move in the length direction of the cylinder 280 inside the cylinder 280, in the vertical direction in the illustrated embodiment.

[0172] Specifically, the movable core 220 can move in the direction toward the fixed core 210 and in the direction away from the fixed core 210.

[0173] The movable core 220 is coupled to the shaft 360. The movable core 220 can move integrally with the shaft 360. When the movable core 220 moves upward or downward, the shaft 360 also moves upward or downward. As a result, the movable contact 320 also moves upward or downward.

[0174] The movable core 220 is located below the fixed core 210. The movable core 220 is separated from the fixed core 210 by a predetermined distance. As described above, the predetermined distance is the distance by which the movable core 220 can move in the vertical direction.

[0175] The movable core 220 extends in the length direction. Inside the movable core 220, a hollow portion extending in the length direction is recessed by a predetermined distance. The core spring 260 and the lower part of the shaft 360 penetratingly coupled to the core spring 260 are partially accommodated in the hollow portion.

[0176] Below the hollow portion, a through hole is formed to penetrate in the longitudinal direction. The hollow portion and the through hole communicate with each other. The lower end portion of the shaft 360 inserted into the hollow portion can extend to the through hole.

[0177] At the lower end portion of the movable core 220, a space portion is recessed by a predetermined distance. The space portion communicates with the through hole. The lower head portion of the shaft 360 is located in the space portion.

[0178] As the control power is applied, the yoke 230 forms a magnetic circuit. The magnetic circuit formed by the yoke 230 may be configured to adjust the direction of the magnetic field formed by the coil 250.

[0179] Thus, when the control power is applied through the sub-contact portion 400, the coil 250 can generate a magnetic field in a direction in which the movable core 220 moves toward the fixed core 210. The yoke 230 may be formed of an electrically conductive material that can be energized.

[0180] The yoke 230 is accommodated in the lower space 121. The yoke 230 surrounds the coil 250. The coil 250 may be accommodated inside the yoke 230 so as to be separated from the inner peripheral surface of the yoke 230 by a predetermined distance.

[0181] Inside the yoke 230, a bobbin 240 is accommodated. That is, the yoke 230, the coil 250, and the bobbin 240 around which the coil 250 is wound are arranged in order in a direction from the outer periphery of the lower frame 120 toward the radially inner side.

[0182] The upper part of the yoke 230 contacts the support plate 140. Also, the outer periphery of the yoke 230 can contact the inner periphery of the lower frame 120 or be positioned so as to be separated from the inner periphery of the lower frame 120 by a predetermined distance.

[0183] The coil 250 is wound around the bobbin 240. The bobbin 240 is accommodated inside the yoke 230.

[0184] The bobbin 240 may include flat upper and lower portions and a cylindrical column portion that extends in the longitudinal direction and connects the upper and lower portions. That is, the bobbin 240 has a bobbin shape.

[0185] The upper portion of the bobbin 240 contacts below the support plate 140. A coil 250 is wound around the column portion of the bobbin 240. The thickness around which the coil 250 is wound may be configured to be the same as or smaller than the diameters of the upper and lower portions of the bobbin 240.

[0186] A hollow portion extending in the longitudinal direction is formed through the column portion of the bobbin 240. A cylinder 280 may be accommodated in the hollow portion. The column portion of the bobbin 240 may be arranged to have the same central axis as the fixed core 210, the movable core 220, and the shaft 360.

[0187] The coil 250 generates a magnetic field by the applied control power supply. The fixed core 210 is magnetized by the magnetic field generated by the coil 250, and an electromagnetic attraction force may be applied to the movable core 220.

[0188] The coil 250 is wound around the bobbin 240. Specifically, the coil 250 is wound around the column portion of the bobbin 240 and laminated on the radially outer side of the column portion. The coil 250 is accommodated inside the yoke 230.

[0189] When the control power supply is applied, the coil 250 generates a magnetic field. At this time, the strength or direction of the magnetic field generated by the coil 250 can be controlled by the yoke 230. The fixed core 210 is magnetized by the magnetic field generated by the coil 250.

[0190] When the fixed core 210 is magnetized, the movable core 220 receives an electromagnetic force, that is, an attractive force, in the direction toward the fixed core 210. As a result, the movable core 220 moves upward in the direction toward the fixed core 210 in the illustrated embodiment.

[0191] A plurality of coils 250 may be provided. The plurality of coils 250 may be configured to form magnetic fields by different control signals applied from the sub-contact portion 400. In the illustrated embodiment, two coils 250 are provided, including a trip coil 251 and a holding coil 252.

[0192] The trip coil 251 and the holding coil 252 may be arranged to be laminated in the radial direction. In the illustrated embodiment, the trip coil 251 is formed to surround the holding coil 252 from the radially outer side of the holding coil 252. For this purpose, a hollow for accommodating the holding coil 252 is formed to penetrate inside the trip coil 251.

[0193] The holding coil 252 is located on the radially inner side of the trip coil 251. The holding coil 252 is formed to surround the cylinder 280, the movable core 220 accommodated therein, the core spring 260, the yoke ring 270, etc. from the radially outer side. For this purpose, a hollow is also formed to penetrate inside the holding coil 252.

[0194] The core spring 260 provides a restoring force for the movable core 220 to return to its original position when the application of the control power supply is released after the movable core 220 moves toward the fixed core 210.

[0195] The core spring 260 is compressed as the movable core 220 moves toward the fixed core 210 and stores the restoring force. At this time, it is preferable that the stored restoring force is smaller than the electromagnetic attraction exerted on the movable core 220 when the fixed core 210 is magnetized. This is to prevent the movable core 220 from arbitrarily returning to its original position by the core spring 260 while the control power supply is applied.

[0196] When the application of the control power supply is released, the movable core 220 receives a restoring force from the core spring 260. Of course, the gravity due to the empty weight of the movable core 220 can also act on the movable core 220. As a result, the movable core 220 can move in a direction away from the fixed core 210 and return to its original position.

[0197] The core spring 260 may be provided in any form that can deform its shape to store the restoring force, return to its original shape, and transmit the restoring force to the outside. In one embodiment, the core spring 260 may be provided as a coil spring.

[0198] A shaft 360 penetrates and is coupled to the core spring 260. The shaft 360 can move in the vertical direction regardless of the shape deformation of the core spring 260 in a state where the core spring 260 is coupled.

[0199] The core spring 260 is accommodated in a hollow portion recessed above the movable core 220. Also, one end of the core spring 260 facing the fixed core 210, the upper end in the illustrated embodiment, is accommodated in a hollow portion recessed below the fixed core 210.

[0200] The yoke ring 270 is coupled to the bobbin 240 and the cylinder 280 respectively to maintain the position of the cylinder 280.

[0201] The yoke ring 270 is accommodated in a hollow formed inside the bobbin 240. A hollow is formed inside the yoke ring 270, and the cylinder 280 and other components accommodated in the cylinder 280 can penetrate through it.

[0202] That is, in the illustrated embodiment, the yoke ring 270 is located between the bobbin 240 and the cylinder 280 in the radial direction.

[0203] The cylinder 280 houses the fixed core 210, the movable core 220, the core spring 260, and the shaft 360. The movable core 220 and the shaft 360 can move in the upward and downward directions inside the cylinder 280.

[0204] The cylinder 280 is located in the hollow portion formed in the column portion of the bobbin 240. The upper end portion of the cylinder 280 contacts the lower surface of the support plate 140.

[0205] The side surface of the cylinder 280 contacts the inner peripheral surface of the column portion of the bobbin 240. The upper opening of the cylinder 280 can be sealed by the fixed core 210. The lower surface of the cylinder 280 can contact the inner surface of the lower frame 120.

[0206] The main contact portion 300 allows or cuts off the energization of the current by the operation of the core portion 200. Specifically, the movable contact 320 of the main contact portion 300 moves and contacts or separates from the fixed contact 310, thereby allowing or cutting off the energization of the current.

[0207] The main contact portion 300 is housed in the upper space 111. The main contact portion 300 can be electrically and physically separated from the core portion 200 by the first insulating plate 150 and the support plate 140.

[0208] The main contact portion 300 is housed inside the arc chamber 500. The arc generated during the operation of the main contact portion 300 can be extinguished by the arc chamber 500 and discharged to the outside.

[0209] In the embodiment shown in FIG. 9, the main contact portion 300 includes a fixed contact 310, a movable contact 320, a housing 330, a cover 340, a contact spring 350, and a shaft 360.

[0210] The fixed contact 310 applies or cuts off the energization between the inside and the outside of the DC relay 10 by contacting or separating from the movable contact 320.

[0211] Specifically, when the fixed contact 310 contacts the movable contact 320, the inside and outside of the DC relay 10 can be energized. On the contrary, when the fixed contact 310 is separated from the movable contact 320, the energization between the inside and outside of the DC relay 10 is cut off.

[0212] As can be seen from the name, the fixed contact 310 does not move. That is, the fixed contact 310 is fixedly coupled to the upper frame 110 and the arc chamber 500. Therefore, the contact and separation between the fixed contact 310 and the movable contact 320 are achieved by the movement of the movable contact 320.

[0213] One end of the fixed contact 310, the upper end in the illustrated embodiment, is exposed outside the upper frame 110. The main terminal 610 of the terminal portion 600 is energizably connected to the one end.

[0214] A plurality of fixed contacts 310 may be provided. In the illustrated embodiment, the fixed contacts 310 include a first fixed contact 311 on the left side and a second fixed contact 312 on the right side, and two are provided.

[0215] The first fixed contact 311 is positioned to be offset to one side, the left side in the illustrated embodiment, from the center in the length direction of the movable contact 320. Also, the second fixed contact 312 is positioned to be offset to the other side, the right side in the illustrated embodiment, from the center in the length direction of the movable contact 320.

[0216] A power source may be energizably connected to either one of the first fixed contact 311 and the second fixed contact 312. Also, a load may be energizably connected to the other one of the first fixed contact 311 and the second fixed contact 312.

[0217] The other end of the fixed contact 310, the lower end in the illustrated embodiment, extends toward the movable contact 320.

[0218] The movable contact 320 contacts the fixed contact 310 when the control power is applied, enabling the DC relay 10 to be energized with an external power source and load. Also, when the application of the control power is released, the movable contact 320 separates from the fixed contact 310, preventing the DC relay 10 from being energized with the external power source and load.

[0219] The movable contact 320 is positioned adjacent to the fixed contact 310.

[0220] Above the movable contact 320 is partially covered by a cover 340. In one embodiment, a part of the upper surface of the movable contact 320 can contact the lower surface of the cover 340.

[0221] Below the movable contact 320 is elastically supported by a contact spring 350. The contact spring 350 can elastically support the movable contact 320 in a compressed state by a predetermined distance so that the movable contact 320 does not move downward arbitrarily.

[0222] The movable contact 320 extends in the longitudinal direction, in the left - right direction in the illustrated embodiment. That is, the length of the movable contact 320 is formed longer than the width. Therefore, both ends of the movable contact 320 in the longitudinal direction housed in the housing 330 are exposed outside the housing 330. The fixed contact 310 contacts both ends.

[0223] The width of the movable contact 320 may be the same as the distance at which the side surfaces of the housing 330 are separated from each other. That is, when the movable contact 320 is housed in the housing 330, both side surfaces of the movable contact 320 in the width direction can contact the inner surfaces of the side surfaces of the housing 330.

[0224] Thereby, the state in which the movable contact 320 is housed in the housing 330 can be stably maintained.

[0225] The housing 330 houses the movable contact 320 and the contact spring 350 that elastically supports the movable contact 320.

[0226] In the illustrated embodiment, the housing 330 is open on one side and the opposite side. A movable contact 320 may be inserted therethrough into the open portion.

[0227] The non-open side surfaces of the housing 330 may be configured to surround the received movable contact 320.

[0228] A cover 340 is provided above the housing 330. The cover 340 covers the upper surface of the movable contact 320 received in the housing 330.

[0229] The housing 330 and the cover 340 are preferably formed of an insulating material so as to prevent unintentional energization. In one embodiment, the housing 330 and the cover 340 may be formed of a synthetic resin or the like.

[0230] The lower part of the housing 330 is connected to a shaft 360. When the movable core 220 connected to the shaft 360 moves upward or downward, the housing 330 and the movable contact 320 received therein can also move upward or downward.

[0231] The housing 330 and the cover 340 can be joined by any member. In one embodiment, the housing 330 and the cover 340 can be joined by fastening members (not shown) such as bolts and nuts.

[0232] The contact spring 350 elastically supports the movable contact 320. When the movable contact 320 contacts the fixed contact 310, the movable contact 320 tends to separate from the fixed contact 310 due to the electromagnetic repulsive force.

[0233] At this time, the contact spring 350 elastically supports the movable contact 320 and prevents the movable contact 320 from arbitrarily separating from the fixed contact 310.

[0234] The contact spring 350 may be provided in any form that can store a restoring force due to a deformation of its shape and provide the stored restoring force to other members. In one embodiment, the contact spring 350 may be provided as a coil spring.

[0235] One end of the contact spring 350 facing the movable contact 320 contacts below the movable contact 320. Also, the other end of the contact spring 350 opposite to the one end contacts above the housing 330.

[0236] The contact spring 350 can be compressed by a predetermined distance and elastically support the movable contact 320 while storing the restoring force. Thereby, even if an electromagnetic repulsive force is generated between the movable contact 320 and the fixed contact 310, the movable contact 320 does not move arbitrarily.

[0237] For stable connection of the contact spring 350, a protrusion (not shown) inserted into the hollow of the contact spring 350 may protrude below the movable contact 320. Similarly, a protrusion (not shown) inserted into the hollow of the contact spring 350 may protrude above the housing 330.

[0238] The shaft 360 transmits the driving force generated as the core portion 200 operates to the main contact portion 300. Specifically, the shaft 360 is connected to the movable core 220 and the movable contact 320. When the movable core 220 moves upward or downward, the movable contact 320 can also move upward or downward by the shaft 360.

[0239] The shaft 360 extends in the length direction, in the vertical direction in the illustrated embodiment. The lower end of the shaft 360 is inserted and coupled to the movable core 220. When the movable core 220 moves in the vertical direction, the shaft 360 can move in the vertical direction together with the movable core 220.

[0240] The body portion of the shaft 360 is penetrated and coupled to the fixed core 210 so as to be vertically movable. A core spring 260 is penetrated and coupled to the body portion of the shaft 360.

[0241] The upper end portion of the shaft 360 is coupled to the housing 330. When the movable core 220 moves, the shaft 360 and the housing 330 can move together.

[0242] The upper end portion and the lower end portion of the shaft 360 may be formed to have a larger diameter than the body portion of the shaft. Thereby, the shaft 360 can stably maintain the coupled state with the housing 330 and the movable core 220.

[0243] The sub-contact portion 400 is energized with an external control power source (not shown), and a control signal and a current applied to the core portion 200 are applied. The sub-contact portion 400 is energized with the core portion 200, and the applied control signal and current can be transmitted to the core portion 200. Thereby, the core portion 200 can form a magnetic field, and the main contact portion 300 can operate.

[0244] The sub-contact portion 400 is accommodated in the upper space 111. In particular, the sub-contact portion 400 according to the embodiment of the present invention may be accommodated inside the arc chamber 500. Thereby, the upper space 111 may be formed in a size capable of accommodating the arc chamber 500, and the overall size of the upper frame 110 and the DC relay 10 can be reduced.

[0245] In the above embodiment, the sub-contact portion 400 is formed so that the components included therein are not damaged by the arc generated inside the arc chamber 500. A detailed description thereof will be described later.

[0246] The sub-contact portion 400 is coupled to the first insulating plate 150. Specifically, each end portion of the sub-contact portion 400 toward the first insulating plate 150, the lower end portion in the illustrated embodiment is inserted into and supported by the holder support portion 151.

[0247] In the illustrated embodiment, the sub-contact portion 400 includes a contact holder 401. The contact holder 401 can mount various components that make up the sub-contact portion 400. The various components of the sub-contact portion 400 can be physically separated from the space inside the arc chamber 500 by the contact holder 401. Therefore, it can be said that the contact holder 401 functions as a kind of housing.

[0248] In the embodiments shown in FIGS. 10 to 13, the sub-contact portion 400 includes a body portion 410, a switch receiving portion 420, a terminal receiving portion 430, a terminal partitioning member 440, a sub-PCB 450, a sub-connector 460, and a sub-switch 470.

[0249] The body portion 410 forms the outer shape of the sub-contact portion 400. The body portion 410 is the portion where the sub-contact portion 400 is exposed inside the arc chamber 500. From this, it will be understood that the body portion 410 can be named the contact holder 401.

[0250] The body portion 410 may be formed of a material with high heat resistance and high pressure resistance. This is to prevent damage caused by heat or pressure generated together with the arc inside the arc chamber 500.

[0251] Also, the body portion 410 may be formed of an insulating material. This is to prevent any energization between the components of the sub-contact portion 400 or between the sub-contact portion 400 and other components. In one embodiment, the body portion 410 may be formed of a material such as ceramic or synthetic resin.

[0252] A space is formed inside the body portion 410. Various components of the sub-contact portion 400 may be accommodated in the space. In the illustrated embodiment, the sub-PCB 450, the sub-connector 460, and the sub-switch 470 are accommodated in the space formed inside the body portion 410.

[0253] The body portion 410 can be of any shape that is supported by the first insulating plate 150 and can be located inside the arc chamber 500. In the illustrated embodiment, the body portion 410 includes a first leg 411, a second leg 412, and a bridge 413.

[0254] The first leg 411 and the second leg 412 extend in the height direction of the DC relay 10, in the vertical direction in the illustrated embodiment. The first leg 411 and the second leg 412 are configured to support the DC relay 10 in the vertical direction.

[0255] In the illustrated embodiment, the body portion 410 is configured to include the first leg 411 and the second leg 412, but the number of legs can be changed. The lower ends of the first leg 411 and the second leg 412 are respectively coupled to a plurality of holder support portions 151 (see FIG. 13).

[0256] Referring to FIG. 10, on the radially outer sides of the first leg 411 and the second leg 412, that is, the front side of the first leg 411 and the rear side of the second leg 412, a plurality of planes are formed continuously with each other. The remaining portions of the first leg 411 and the second leg 412 are composed of a single plane.

[0257] That is, in the illustrated embodiment, the cross-sections of the first leg 411 and the second leg 412 are formed to have at least five surfaces. The shapes of the first leg 411 and the second leg 412 can be changed according to the shape of the holder support portion 151.

[0258] The upper ends of the first leg 411 and the second leg 412 are continuous with the bridge 413.

[0259] The bridge 413 extends between the first leg 411 and the second leg 412 and reinforces the rigidity of the first leg 411 and the second leg 412. In the illustrated embodiment, the bridge 413 extends in the front-rear direction, and each end is coupled to the first leg 411 and the second leg 412.

[0260] On one side of the bridge 413, in the illustrated embodiment, on the upper surface, an indicator for an operator to recognize the state of the sub-contact portion 400 may be formed. In the illustrated embodiment, "NC", that is, Normal Close, is displayed on the front side of the bridge 413, and "NO", that is, Normal Open, is displayed on the rear side of the bridge 413.

[0261] Inside the first leg 411 and the second leg 412, a switch receiving portion 420, a terminal receiving portion 430, and a terminal partitioning member 440 are arranged.

[0262] The switch receiving portion 420 houses the sub-switch 470. The switch receiving portion 420 is defined as a part of the space formed inside the first leg 411 and the second leg 412. One end of the switch receiving portion 420, in the illustrated embodiment, the upper side, is formed open, and the sub-switch 470 can be inserted and pulled out.

[0263] The switch receiving portion 420 may be formed to have a predetermined cross-sectional area and depth. As shown in FIG. 12, it is preferable that the cross-sectional area and depth of the switch receiving portion 420 are determined by the shape of the sub-switch 470.

[0264] A plurality of switch receiving portions 420 may be formed. The plurality of switch receiving portions 420 may be respectively formed inside the first leg 411 and the second leg 412. In the embodiment shown in FIG. 12, two switch receiving portions 420 are formed including a first switch receiving portion 421 and a second switch receiving portion 422.

[0265] The first switch receiving portion 421 is located on the rear side of the first leg 411, and the second switch receiving portion 422 is located on the front side of the second leg 412. In other words, the switch receiving portion 420 can be expressed as the space formed radially inward in the internal spaces of the first leg 411 and the second leg 412.

[0266] The terminal receiving portion 430 is positioned adjacent to the switch receiving portion 420. The switch receiving portion 420 is partitioned from the terminal receiving portion 430 by a partition wall (not shown).

[0267] The terminal receiving portion 430 houses the sub-connector 460. The terminal receiving portion 430 is defined by another part of the space formed inside the first leg 411 and the second leg 412. One end of the terminal receiving portion 430, the upper part in the illustrated embodiment, is open-formed, and the sub-connector 460 can be inserted and pulled out.

[0268] The terminal receiving portion 430 may be formed to have a predetermined cross-sectional area and depth. As shown in FIG. 12, it is preferable that the cross-sectional area and depth of the terminal receiving portion 430 are determined by the shape of the sub-connector 460.

[0269] The terminal receiving portion 430 may be partitioned into a plurality of spaces. The sub-connector 460 may be respectively housed in the plurality of partitioned spaces. In the illustrated embodiment, the terminal receiving portion 430 is partitioned into two spaces by the terminal partitioning member 440.

[0270] A plurality of terminal receiving portions 430 may be formed. The plurality of terminal receiving portions 430 may be respectively formed inside the first leg 411 and the second leg 412. In the embodiment shown in FIG. 12, two terminal receiving portions 430 are formed, including the first terminal receiving portion 431 and the second terminal receiving portion 432.

[0271] The first terminal receiving portion 431 is located on the front side of the first leg 411, and the second terminal receiving portion 432 is located on the rear side of the second leg 412. In other words, the terminal receiving portion 430 can be expressed as the space formed radially outside in the internal spaces of the first leg 411 and the second leg 412.

[0272] The terminal partitioning member 440 is located in the terminal receiving portion 430 and partitions the terminal receiving portion 430 into a plurality of spaces. A plurality of sub-connectors 460 are respectively accommodated in the partitioned plurality of spaces and can be physically and electrically separated.

[0273] The terminal partitioning member 440 may be provided in any form that can physically and electrically separate the terminal receiving portion 430. In the illustrated embodiment, the terminal partitioning member 440 is provided by a partition wall extending in the direction in which the bridge 413 extends, that is, in the front-rear direction.

[0274] A plurality of terminal partitioning members 440 may be provided. The plurality of terminal partitioning members 440 can partition the plurality of terminal receiving portions 430 into a plurality. In the illustrated embodiment, two terminal partitioning members 440 are provided, including a first terminal partitioning member 441 located in the first terminal receiving portion 431 and a second terminal partitioning member 442 located in the second terminal receiving portion 432.

[0275] One end portion of the switch receiving portion 420 and the terminal receiving portion 430, the upper end portion in the illustrated embodiment, communicates. A sub-PCB 450 may be accommodated in the space formed by the communication.

[0276] The sub-PCB 450 operates by a control signal and current applied via the conductive member W. The sub-PCB 450 controls the operation of the core portion 200 by applying or releasing current to the coil 250 of the core portion 200. Thereby, the main contact portion 300 also operates, and the DC relay 10 can be energized or disconnected from an external power source and load.

[0277] The sub-PCB 450 is respectively energized with the sub-connector 460 and the sub-switch 470. The sub-PCB 450 can process the current, control signal transmitted via the sub-connector 460 and the control signal applied via the sub-switch 470 and transmit them to other components.

[0278] The sub-PCB 450 is housed in the contact holder 401. Specifically, the sub-PCB 450 is housed in a space formed upward in the embodiment shown, on the side where the switch receiving portion 420 and the terminal receiving portion 430 communicate with each other.

[0279] For this purpose, the upper ends of the partition member that partitions the switch receiving portion 420 and the terminal receiving portion 430 and the terminal partitioning member 440 can be positioned lower than the upper ends of the first leg 411 and the second leg 412.

[0280] In one embodiment, a part of the sub-PCB 450 may be housed in the switch receiving portion 420, and the other part may be housed in the terminal receiving portion 430. In the above embodiment, the sub-PCB 450 can be supported by a partition wall (not shown) that partitions the switch receiving portion 420 and the terminal receiving portion 430 and the terminal partitioning member 440.

[0281] A plurality of sub-PCBs 450 may be provided. The plurality of sub-PCBs 450 may be respectively housed in the first leg 411 and the second leg 412. In the embodiment shown, two sub-PCBs 450 are provided, including a first sub-PCB 451 housed inside the first leg 411 and a second sub-PCB 452 housed inside the second leg 412.

[0282] The first sub-PCB 451 is housed in a first switch receiving portion 421 and a first terminal receiving portion 431 formed inside the first leg 411. The second sub-PCB 452 is housed in a second switch receiving portion 422 and a second terminal receiving portion 432 formed inside the second leg 412.

[0283] The sub-connector 460 energizes the conductive member W and the sub-PCB 450. The sub-connector 460 can be coupled to the sub-PCB 450 and removably coupled to the conductive member W.

[0284] The sub - connector 460 is coupled to the sub - PCB 450. In the illustrated embodiment, the sub - connector 460 is coupled to the outer corner of the sub - PCB 450. The sub - connector 460 is energized with the sub - PCB 450.

[0285] The sub - connector 460 is received in the terminal receiving portion 430. At this time, a plurality of sub - connectors 460 may be coupled to a single sub - PCB 450 and respectively received in the terminal receiving portion 430. In the illustrated embodiment, two sub - connectors 460, that is, a pair of sub - connectors 460, are coupled to a single sub - PCB 450.

[0286] A pair of sub - connectors 460 can be physically and electrically separated from each other. A pair of sub - connectors 460 may be respectively received in a plurality of spaces in which the terminal receiving portion 430 is partitioned by the terminal partitioning member 440.

[0287] The sub - connectors 460 may be provided in a plurality of pairs. A plurality of pairs of sub - connectors 460 can be coupled to and energized with different sub - PCBs 450. In the illustrated embodiment, the sub - connectors 460 include a pair of first sub - connectors 461 that are coupled to and energized with the first sub - PCB 451 and a pair of second sub - connectors 462 that are coupled to and energized with the second sub - PCB 452, and are provided in two pairs.

[0288] The sub - connector 460 is energized with the conductive member W. As shown in FIG. 17, the conductive member W is energized with the sub - terminal 620 of the terminal portion 600, the sub - terminal 620 is energized with the sub - connector 460, and the sub - connector 460 can be energized with an external control power source.

[0289] The sub - connector 460 is energized with the sub - switch 470 via the sub - PCB 450.

[0290] The sub-switch 470 is energized with the sub-PCB 450 and applies a control signal for operating the sub-PCB 450. The sub-switch 470 may be configured to operate the state of the sub-contact portion 400 as "NO" or "NC".

[0291] The sub-switch 470 may be configured to operate even with a minute pressure. In one embodiment, when an elastic member such as a spring is included and an external pressure disappears, it may be configured to return to its original position.

[0292] The sub-switch 470 is located adjacent to the sub-PCB 450. The sub-switch 470 is housed in a switch receiving portion 420 formed inside the body portion 410. As described above, the switch receiving portion 420 is partitioned by a terminal receiving portion 430 and a partition wall, and the sub-switch 470 and the sub-connector 460 are physically separated.

[0293] A plurality of sub-switches 470 may be provided. The plurality of sub-switches 470 are respectively coupled to the plurality of sub-PCBs 450 and are energizable. In the illustrated embodiment, the sub-switch 470 includes a first sub-switch 471 coupled to a first sub-PCB 451 located on the front side and a second sub-switch 472 coupled to a second sub-PCB 452 located on the rear side.

[0294] The first sub-switch 471 is housed in a first switch receiving portion 421 formed in the first leg 411. The second sub-switch 472 is housed in a second switch receiving portion 422 formed in the second leg 412.

[0295] The arc chamber 500 extinguishes an arc arc generated when the fixed contact 310 and the movable contact 320 are separated in an internal space (hereinafter, chamber space 501). Thus, the arc chamber 500 may also be referred to as an "arc extinguishing portion".

[0296] In the chamber space 501 of the arc chamber 500, the main contact portion 300 and the sub-contact portion 400 are accommodated. Further, an arc induction portion 700 is coupled to the outside of the arc chamber 500. Thereby, an arc formed by the fixed contact 310 and the movable contact 320 of the main contact portion 300 coming into contact or separating can be induced and extinguished by the arc induction portion 700.

[0297] In the chamber space 501 of the arc chamber 500, the movable contact 320 is accommodated so as to be able to move up and down. The movable contact 320 may move up and down in the direction toward the fixed contact 310 and in the opposite direction while being accommodated in the chamber space 501.

[0298] The chamber space 501 may be filled with arc extinguishing gas. The arc extinguishing gas allows the generated arc to be extinguished and discharged to the outside of the DC relay 1 through a predetermined path. For this purpose, a communication hole (not shown) may be formed to penetrate the wall body surrounding the chamber space 501.

[0299] The arc chamber 500 may be formed of an insulating material. Further, the arc chamber 500 may be formed of a material having high voltage resistance and high heat resistance. This is due to the fact that the generated arc is a flow of high-temperature and high-pressure electrons. In one embodiment, the arc chamber 500 may be formed of a ceramic material.

[0300] The arc chamber 500 is accommodated inside the frame 100. Specifically, the arc chamber 500 is accommodated in the upper space 111, and its outside is surrounded by the upper frame 110. An arc induction portion 700 is disposed between the arc chamber 500 and the upper frame 110, and can induce the generated arc.

[0301] The arc chamber 500 can have any shape that houses the main contact portion 300 and the sub-contact portion 400 in the chamber space 501 and can extinguish the generated arc. In the illustrated embodiment, the arc chamber 500 has a square cross-section and is in the shape of a square prism extending in the vertical direction.

[0302] In particular, the arc chamber 500 according to the embodiment of the present invention can ensure a sufficient insulation distance between the main contact portion 300 and the sub-contact portion 400 by its own structure without deforming the shape of the frame 100. Also, a space of sufficient size for the generated arc to be extinguished can be secured inside the arc chamber 500.

[0303] Furthermore, the arc guiding portion 700 provided outside the arc chamber 500 due to the structure of the arc chamber 500 can also be arranged in various forms and can effectively guide the generated arc. A detailed description thereof will be given later.

[0304] In the embodiments shown in FIGS. 14 to 18, the arc chamber 500 includes a wall portion 510, an opening portion 520, and a sealing member 530.

[0305] The wall portion 510 forms the outer surface of the arc chamber 500. The wall portion 510 is arranged to surround the chamber space 501 from various directions. The wall portion 510 may be formed of a material with high heat resistance and high insulation. In one embodiment, the wall portion 510 may be formed of a ceramic material.

[0306] A plurality of wall portions 510 may be provided. The plurality of wall portions 510 may be arranged to surround the chamber space 501 at different positions. The wall portions 510 arranged adjacent to each other can be continuous at a predetermined angle.

[0307] In the illustrated embodiment, the wall portion 510 includes a first wall 511, a second wall 512, a third wall 513, a fourth wall 514, and a fifth wall 515.

[0308] The first wall 511 forms one side of the arc chamber 500, specifically the front left side in the illustrated embodiment. The second wall 512 forms the other side of the arc chamber 500, specifically the front right side in the illustrated embodiment. The third wall 513 forms yet another side of the arc chamber 500, specifically the rear left side in the illustrated embodiment. Also, the fourth wall 514 forms still another side of the arc chamber 500, specifically the rear right side in the illustrated embodiment.

[0309] Furthermore, the fifth wall 515 forms yet another side of the arc chamber 500, specifically the upper surface in the illustrated embodiment.

[0310] At this time, the first wall 511 and the fourth wall 514 are arranged to face each other with the chamber space 501 therebetween. Also, the second wall 512 and the third wall 513 are arranged to face each other with the chamber space 501 therebetween.

[0311] The first wall 511 to the fifth wall 515 can be continuous with adjacent walls at a predetermined angle. In the illustrated embodiment, the first wall 511 is continuous with the second wall 512, the third wall 513, and the fifth wall 515. Also, the second wall 512 is continuous with the first wall 511, the fourth wall 514, and the fifth wall 515. In one embodiment, the predetermined angle can be a right angle.

[0312] In one embodiment, the first wall 511 and the fourth wall 514 facing each other can extend parallel to each other. Also, the second wall 512 and the third wall 513 facing each other can extend parallel to each other. At this time, the first wall 511 and the fourth wall 514 can extend the same length as each other. Also, the second wall 512 and the third wall 513 can also extend the same length as each other.

[0313] In the above-described embodiment, the shape of the horizontal cross-section of the arc chamber 500 can be a quadrilateral, particularly a rhombus shape. In the illustrated embodiment, the arc chamber 500 is formed such that the first wall 511, the second wall 512, the third wall 513, and the fourth wall 514 extend by the same length from each other. Accordingly, in the above-described embodiment, the arc chamber 500 is formed to have a square cross-section in its horizontal direction.

[0314] As a result, the distance between at least one pair of vertices among the pairs of vertices arranged to face each other across the chamber space 501 among the vertices of the cross-section of the arc chamber 500 may be formed longer than the distance between the walls facing each other.

[0315] Therefore, when the first fixed contact 311 and the second fixed contact 312 are arranged adjacent to a pair of vertices facing each other, and the first leg 411 and the second leg 412 of the sub-contact portion 400 are arranged adjacent to the other pair of vertices facing each other, a sufficient insulation distance between the main contact portion 300 and the sub-contact portion 400 can be ensured.

[0316] The first wall 511, the second wall 512, the third wall 513, and the fourth wall 514 are surrounded by the magnet portion 740 provided in the arc guiding portion 700. As a result, the first wall 511, the second wall 512, the third wall 513, and the fourth wall 514 can cause the magnetic field that guides the arc to diverge or converge by the magnet portion 740 on the outside thereof.

[0317] The first wall 511, the second wall 512, the third wall 513, and the fourth wall 514 are each continuous with the fifth wall 515.

[0318] The fifth wall 515 is configured to further cover the chamber space 501 from the other side, which is above in the illustrated embodiment. The fifth wall 515 forms the upper surface of the wall body portion 510.

[0319] An opening 520 is formed in the fifth wall 515. The fixed contact 310 and the terminal portion 600 that are partially accommodated in the chamber space 501 can enter the chamber space 501 through the opening 520.

[0320] In the illustrated embodiment, the wall body portion 510 is formed to surround the chamber space 501 from five directions. From this, it will be understood that the lower part of the chamber space 501, that is, the direction toward the lower frame 120, is formed open and is sealed by the support plate 140 and the first insulating plate 150.

[0321] The opening 520 functions as a passage through which the components partially accommodated in the chamber space 501 pass. The opening 520 is formed through one wall of the wall body portion 510, and in the illustrated embodiment, it is formed through the fifth wall 515 located above.

[0322] A plurality of openings 520 may be formed. The plurality of openings 520 are arranged spaced apart from each other, and different components can penetrate and be coupled to each other. In the illustrated embodiment, the opening 520 includes a main opening 521, a sub - opening 522, and a pipe opening 523.

[0323] The fixed contact 310 penetrates and is coupled to the main opening 521. A part of the extension direction of the fixed contact 310, in the illustrated embodiment, the lower part, penetrates the main opening 521 and can be located above the chamber space 501. The remaining part of the extension direction of the fixed contact 310, in the illustrated embodiment, the upper part, is exposed outside the chamber space 501 and can be coupled to the main terminal 610 for energization.

[0324] A plurality of main openings 521 may be provided. A plurality of fixed contacts 310 can penetrate the plurality of main openings 521 respectively. In the illustrated embodiment, the main opening 521 includes a first main opening 521a located on the left side through which the first fixed contact 311 penetrates and a second main opening 521b located on the right side through which the second fixed contact 312 penetrates.

[0325] A sub-opening 522 is formed at a distance from the main opening 521.

[0326] The sub-terminal 620 of the terminal portion 600 penetrates and is coupled to the sub-opening 522. A part of the sub-terminal 620 in the extending direction, the lower part in the illustrated embodiment, can penetrate the sub-opening 522 and be located above the chamber space 501. The remaining part of the sub-terminal 620 in the extending direction, the upper part in the illustrated embodiment, is exposed outside the chamber space 501 and can be coupled to and energized with the conductor member W.

[0327] The sub-openings 522 may be formed in a plurality of groups or pairs. A plurality of sub-terminals 620 can penetrate the plurality of groups of sub-openings 522 respectively. In the illustrated embodiment, the sub-openings 522 are positioned so as to be biased toward the front side, and include a first sub-opening 522a through which the first sub-terminal 621 penetrates and a second sub-opening 522b positioned so as to be biased toward the rear side and through which the second sub-terminal 622 penetrates.

[0328] A plurality of the first sub-openings 522a and the second sub-openings 522b may be formed respectively. A plurality of the first sub-terminals 621 and the second sub-terminals 622 can penetrate the plurality of first sub-openings 522a and the second sub-openings 522b respectively. In the illustrated embodiment, two of the first sub-openings 522a and the second sub-openings 522b are provided respectively, and two of the first sub-terminals 621 and the second sub-terminals 622 penetrate respectively.

[0329] The number and arrangement of the first sub-openings 522a and the second sub-openings 522b can be changed according to the number and arrangement of the sub-connector 460 and the sub-terminals 620.

[0330] The pipe member 630 of the terminal portion 600 penetrates and is coupled to the pipe opening 523. A part of the pipe member 630 in the extending direction, the lower part in the illustrated embodiment, can penetrate the pipe opening 523 and be located above the chamber space 501. The remaining part of the pipe member 630 in the extending direction, the upper part in the illustrated embodiment, is exposed outside the chamber space 501 and can function as a path through which the extinguished arc is discharged.

[0331] The pipe opening 523 is located adjacent to the sub-opening 522. In the illustrated embodiment, the pipe opening 523 is located adjacent to the first sub-opening 522a located on the front side. The position of the pipe opening 523 can be changed to any position where the chamber space 501 communicates with the outside in order for the arc to be extinguished and discharged.

[0332] The seal member 530 forms one side of the arc chamber 500 facing the lower frame 120, the lower end in the illustrated embodiment. The seal member 530 can extend along the corner of the one end of the arc chamber 500, that is, the lower end.

[0333] The seal member 530 ensures the airtightness between the arc chamber 500 and the support plate 140. Therefore, the arc chamber 500 and the support plate 140 are hermetically coupled, and arcs and the like do not flow out arbitrarily through them.

[0334] A hollow is formed inside the seal member 530. Therefore, the lifting and lowering of the shaft 360 and the movable contact 320 coupled thereto are not reduced by the hermetic coupling of the arc chamber 500 and the support plate 140.

[0335] The terminal portion 600 communicates the main contact portion 300 and the sub-contact portion 400 with an external power source or load. The terminal portion 600 penetrates and is coupled to the arc chamber 500, and a part of it is located inside the arc chamber 500 (that is, the chamber space 501), and the other part is located outside the arc chamber 500.

[0336] The terminal portion 600 is penetrated and coupled to the opening 520 of the arc chamber 500. The terminal portion 600 can be supported by the fifth wall 515.

[0337] The terminal portion 600 may be formed of any material that can be energized with other coupled members. In one embodiment, the terminal portion 600 may be formed of a copper (Cu) material.

[0338] In the illustrated embodiment, each component of the terminal portion 600 has a circular cross-section and is in a cylindrical shape extending in the vertical direction, but the shape can be changed according to the shapes of the fixed contact 310 and the opening 520 of the arc chamber 500.

[0339] In the embodiments shown in FIGS. 14 to 18, the terminal portion 600 includes a main terminal 610, a sub-terminal 620, and a pipe member 630.

[0340] The main terminal 610 energizes the fixed contact 310 with an external power source and load. The main terminal 610 is coupled and energized with the fixed contact 310, an external power source, and a load, respectively.

[0341] A plurality of main terminals 610 may be provided. The plurality of main terminals 610 can be respectively coupled and energized with the plurality of fixed contacts 310. In the illustrated embodiment, the main terminal 610 is located on the left side and includes a first main terminal 611 that is coupled and energized with the first fixed contact 311, and a second main terminal 612 that is located on the right side and is coupled and energized with the second fixed contact 312.

[0342] The sub-terminal 620 energizes the sub-connector 460 of the sub-contact portion 400 with an external control power source (not shown). The sub-terminal 620 is coupled and energized with the sub-connector 460 and the wire member W, respectively. It will be understood that the wire member W is coupled and energized with an external control power source (not shown).

[0343] A plurality of sub - terminals 620 may be provided. The plurality of sub - terminals 620 can be respectively connected and energized with a plurality of sub - connectors 460. In the illustrated embodiment, the sub - terminals 620 are located on the front side and include a pair of first sub - terminals 621 that are respectively connected and energized with a pair of first sub - connectors 461, and are located on the rear side and include a pair of second sub - terminals 622 that are respectively connected and energized with a pair of second sub - connectors 462.

[0344] The first sub - terminal 621 is penetrated and connected to the first sub - opening 522a, and the second sub - terminal 622 is penetrated and connected to the second sub - opening 522b.

[0345] The pipe member 630 forms a path through which the arc generated in the chamber space 501 is extinguished and discharged to the outside. The pipe member 630 extends in the direction in which the main terminal 610 or the sub - terminal 620 extends, and in the illustrated embodiment, extends in the vertical direction. Inside the pipe member 630, a hollow portion may be formed penetrating along its extending direction, and a path through which the arc is discharged may be formed.

[0346] The pipe member 630 is penetrated and connected to the pipe opening 523. One end of the pipe member 630 can be located above the chamber space 501, and the other end can be located outside the chamber space 501.

[0347] The arc induction part 700 forms a magnetic field for inducing the arc generated inside the arc chamber 500, that is, in the chamber space 501. As is known, the formed magnetic field forms a magnetic force together with the current energized to the fixed contact 310 and the movable contact 320. The generated arc can extend along the direction of the formed magnetic force and be extinguished and discharged.

[0348] The arc induction part 700 is located outside the arc chamber 500. The arc induction part 700 surrounds the arc chamber 500 and is coupled to the arc chamber 500. In the embodiment shown in FIG. 17, the arc induction part 700 surrounds and is coupled to the upper and outer peripheral surfaces of the arc chamber 500.

[0349] The arc induction unit 700 can be detachably coupled to the arc chamber 500. In the above-described embodiment, only the component that requires maintenance or replacement among the arc chamber 500 or the arc induction unit 700 can be separated.

[0350] The arc induction unit 700 is accommodated inside the frame 100. Specifically, the arc induction unit 700 is accommodated in the upper space 111 of the upper frame 110. At this time, the arc induction unit 700 is located between the arc chamber 500 and the upper frame 110. That is, along the radially inner direction, the outer peripheral surface of the upper frame 110, the arc induction unit 700, and the arc chamber 500 are arranged in this order.

[0351] The arc induction unit 700 can be coupled to the conductor member W. The conductor member W extends along the arc induction unit 700, and in a state where a part thereof is coupled to the arc induction unit 700, its end portions are respectively coupled to the sub-terminals 620 and can be energized.

[0352] Each component of the arc induction unit 700 described below can be detachably coupled to each other. Therefore, when maintenance of a specific component of the arc induction unit 700 is required, only the component can be replaced and used, and economy and productivity can be improved.

[0353] In the embodiments shown in FIGS. 17 to 20, the arc induction unit 700 includes a magnet housing 710, an arc opening 720, a second insulating plate 730, a magnet part 740, and a magnet cover member 750.

[0354] The magnet housing 710 forms the outer shape of the arc induction unit 700. The magnet housing 710 can be coupled to other components of the arc induction unit 700.

[0355] The magnet housing 710 is formed to surround the arc chamber 500. The magnet housing 710 is formed to surround one or more of the walls of the arc chamber 500 that surround the chamber space 501. In the illustrated embodiment, the magnet housing 710 is formed to surround the first to fourth walls 511, 512, 513, 514 that are radially outside the chamber space 501 in the horizontal direction and the fifth wall 515 that is positioned to cover the chamber space 501 from above.

[0356] The magnet housing 710 houses the magnet portion 740. The magnet portion 740 can form a magnetic field in the chamber space 501 when housed in the magnet housing 710.

[0357] The magnet housing 710 may be formed of an insulating material. This is to prevent the magnet portions 740 housed in the magnet housing 710 from being arbitrarily energized with each other, and to prevent the magnetic field formed by any one of the magnet portions 740 from affecting other magnets. In one embodiment, the magnet housing 710 may be formed of the same ceramic material as the arc chamber 500.

[0358] In the illustrated embodiment, the magnet housing 710 includes a first support wall 711, a second support wall 712, a third support wall 713, a fourth support wall 714, and a cover member 715.

[0359] The first support wall 711 forms one surface of the magnet housing 710, the front left surface in the illustrated embodiment. The first support wall 711 is formed to surround the first wall 511 of the arc chamber 500 from the outside.

[0360] Inside the first support wall 711, a space penetrating in the thickness direction, the front left and rear right directions in the illustrated embodiment, is formed. The space can be defined as the first magnet space portion 711a. The first magnet 741 can be removably coupled to the first magnet space portion 711a. The first magnet space portion 711a may be formed to correspond to the shape of the first magnet 741.

[0361] The second support wall 712 forms the other surface of the magnet housing 710, which is the front right surface in the illustrated embodiment. The second support wall 712 is formed to surround the second wall 512 of the arc chamber 500 from the outside.

[0362] Inside the second support wall 712, a space is formed that penetrates in the thickness direction, which is the direction from the front right to the rear left in the illustrated embodiment. The said space can be defined as the second magnet space portion 712a. The second magnet 742 can be detachably coupled to the second magnet space portion 712a. The second magnet space portion 712a may be formed to correspond to the shape of the second magnet 742.

[0363] The third support wall 713 forms the other other surface of the magnet housing 710, which is the rear left surface in the illustrated embodiment. The third support wall 713 is formed to surround the third wall 513 of the arc chamber 500 from the outside.

[0364] Inside the third support wall 713, a space is formed that penetrates in the thickness direction, which is the direction from the front right to the rear left in the illustrated embodiment. The said space can be defined as the third magnet space portion 713a. The third magnet 743 can be detachably coupled to the third magnet space portion 713a. The third magnet space portion 713a may be formed to correspond to the shape of the third magnet 743.

[0365] The fourth support wall 714 forms yet another other surface of the magnet housing 710, which is the rear right surface in the illustrated embodiment. The fourth support wall 714 is formed to surround the fourth wall 514 of the arc chamber 500 from the outside.

[0366] Inside the fourth support wall 714, a space penetrating in the thickness direction, in the front left and rear right directions in the illustrated embodiment, is formed. The said space can be defined as the fourth magnet space portion 714a. The fourth magnet 744 can be detachably coupled to the fourth magnet space portion 714a. The fourth magnet space portion 714a may be formed to correspond to the shape of the fourth magnet 744.

[0367] At this time, the first support wall 711 and the third support wall 713 facing each other can extend in parallel with the same length. Also, the second support wall 712 and the fourth support wall 714 facing each other can also extend in parallel with the same length.

[0368] In the illustrated embodiment, the joint portions of the walls 511, 512, 513, 514 that are adjacent to each other among the first to fourth walls 511, 512, 513, 514 are formed to be rounded so as to be convex outward. On the other hand, the first to fourth support walls 711, 712, 713, 714 are formed flat, and it is not easy to surround the said joint portion.

[0369] From this, the first to fourth support walls 711, 712, 713, 714 can extend in the horizontal direction by a predetermined length. At this time, the horizontal extension length of the first to fourth support walls 711, 712, 713, 714 may be formed shorter than the horizontal extension length of the first to fourth walls 511, 512, 513, 514.

[0370] Therefore, a predetermined space is formed between each of the first to fourth support walls 711, 712, 713, 714 that are adjacent to each other. Through the said predetermined space, the joint portions of the walls 511, 512, 513, 514 that are adjacent to each other among the first to fourth walls 511, 512, 513, 514 can be exposed. The said portion may be surrounded by a magnet cover member 750 described later. The first to fourth support walls 711, 712, 713, 174 are coupled to the cover member 715. The first to fourth support walls 711, 712, 713, 714 form a predetermined angle with the cover member 715 and extend downward in the illustrated embodiment in a direction toward the lower frame 120.

[0371] In one embodiment, the predetermined angle may be the same as the angle between the first to fourth walls 511, 512, 513, 514 and the fifth wall 515 of the arc chamber 500. In one embodiment, the predetermined angle may be a right angle.

[0372] The cover member 715 forms still another other surface of the magnet housing 710, the upper surface in the illustrated embodiment. The cover member 715 is formed to surround the fifth wall 515 of the arc chamber 500 from the outside.

[0373] A second insulating plate 730 is provided between the cover member 715 and the fifth wall 515, and any energization between the cover member 715 and the fifth wall 515 or the arc chamber 500 can be blocked.

[0374] Inside the cover member 715, a plurality of openings penetrating in the thickness direction, in the vertical direction in the illustrated embodiment, are formed. A plurality of fixed contacts 310 can penetrate and be coupled to the openings.

[0375] The cover member 715 may be formed in a shape corresponding to the shape of the fifth wall 515. Accordingly, the cover member 715 may be formed to completely cover the fifth wall 515 from above. Therefore, the lower portion of the magnet housing 710 is formed to be open.

[0376] In the illustrated embodiment, the cover member 715 includes four corners, extends such that each pair of opposite corners is parallel, and is chamfered so that the portions where adjacent corners are continuous are rounded. In one embodiment, the cross-section of the cover member 715 can be in the shape of a rhombus or a square. It will be understood that the shape is similar to the shape of the horizontal cross-section of the arc chamber 500.

[0377] The space formed and surrounded by the first to fourth support walls 711, 712, 713, 714 and the cover member 715 can be defined as the accommodation space S. The arc chamber 500 is removably accommodated in the accommodation space S. The lower part of the accommodation space S is open, and the arc chamber 500 can be inserted into and removed from the accommodation space S through the lower part.

[0378] An opening communicating with the outside may be formed in a radially outer part of the accommodation space S. It will be understood that the opening is a space formed by separating the walls adjacent to each other among the first to fourth support walls 711, 712, 713, 714.

[0379] In the illustrated embodiment, the cover member 715 includes a plurality of corners continuous with the first to fourth support walls 711, 712, 713, 714, and the portions where the plurality of adjacent corners are continuous are chamfered (tapered) to be rounded. The above-mentioned portions may be covered by a magnet cover member 750 described later.

[0380] The fixed contact 310 penetrates and is coupled to the arc opening 720. The fixed contact 310 can penetrate through the arc opening 720, a plurality of openings formed through the second insulating plate 730, and the main opening 521 in sequence, and extend between the chamber space 501 and the outside of the upper frame 110.

[0381] The arc opening 720 is formed to penetrate inside the cover member 715. The arc opening 720 is formed to penetrate in the thickness direction of the cover member 715, in the vertical direction in the illustrated embodiment, and communicate the lower and upper parts of the cover member 715.

[0382] The arc opening 720 communicates with a plurality of openings formed through the second insulating plate 730. Also, the arc opening 720 communicates with the main opening 521 formed in the arc chamber 500. Thereby, the arc opening 720 can communicate with the chamber space 501.

[0383] A plurality of arc openings 720 may be formed. A plurality of fixed contacts 310 can penetrate and be coupled to some of the plurality of arc openings 720 respectively. Also, a lead member W may penetrate or be accommodated in some of the plurality of arc openings 720.

[0384] In the illustrated embodiment, the arc opening 720 is formed on the left side and includes a first arc opening 721 through which the first fixed contact 311 penetrates and a second arc opening 722 formed on the right side through which the second fixed contact 312 penetrates. The shapes of the first arc opening 721 and the second arc opening 722 can be changed according to the shape of the fixed contact 310.

[0385] Also, in the illustrated embodiment, the arc opening 720 includes a lead receiving portion 723 that accommodates the end portion of the lead member W and a lead groove 724 that accommodates a part of the remaining portion of the lead member W.

[0386] The lead receiving portion 723 is a portion where the end portion of the lead member W is coupled to the sub-terminal 620. The lead receiving portion 723 includes a part recessed by a predetermined depth from one surface, in the illustrated embodiment, the upper surface of the cover member 715 and another part located inside the said part and penetratingly formed in the thickness direction of the cover member 715.

[0387] The sub-terminal 620 can penetrate the cover member 715 through the said another part. The end portion of the lead member W is accommodated in the said part and can be coupled to and energized with the end portion of the sub-terminal 620.

[0388] At this time, the extended portion of the wire member W, that is, other portions that are not end portions, are inserted and coupled to wire grooves recessed in any one or more of the first to fourth support walls 711, 712, 713, 714.

[0389] A plurality of wire receiving portions 723 and wire grooves 724 may be formed. As described above, in the illustrated embodiment, the sub-terminal 620 includes a pair of first sub-terminals 621 and a pair of second sub-terminals 622. The wire receiving portions 723 are all formed on the front side and the rear side and can accommodate the first sub-terminals 621 and the second sub-terminals 622 respectively.

[0390] The wire grooves 724 may also be recessed in any one or more of the first to fourth support walls 711, 712, 713, 714. In the illustrated embodiment, the wire grooves 724 are respectively formed on the front side, below, and on the rear side and below of the first and second support walls 711, 712 and the third and fourth support walls 713, 714.

[0391] The second insulating plate 730 prevents any energization between the cover member 715 and the arc chamber 500. The second insulating plate 730 is located between the cover member 715 and the fifth wall 515.

[0392] The second insulating plate 730 may be formed of an insulating material. In one embodiment, the second insulating plate 730 may be formed of a rubber or ceramic material.

[0393] The second insulating plate 730 may be formed to correspond to the shapes of the fifth wall 515 and the cover member 715. In the illustrated embodiment, the second insulating plate 730 has a rhombus or square shape that extends such that the corners of each pair facing each other are parallel, similar to the fifth wall 515 or the cover member 715.

[0394] A plurality of through holes are formed inside the second insulating plate 730.

[0395] Among a plurality of through-holes, a pair of through-holes that are spaced apart in the left-right direction and have a relatively large cross-section in the illustrated embodiment communicate with the arc opening 720 and the main opening 521. Fixed contacts 310 are respectively penetrated and coupled to the pair of through-holes.

[0396] Among the other part of the plurality of through-holes, two pairs of through-holes that are spaced apart in the left-right direction and have a relatively small cross-section in the illustrated embodiment communicate with the arc opening 720 and the sub-opening 522. Sub-terminals 620 are respectively penetrated and coupled to the two pairs of through-holes.

[0397] Among the remaining part of the plurality of through-holes, a single through-hole located on the front side in the illustrated embodiment communicates with the wire receiving portion 723 located on the front side and the pipe opening 523. A pipe member 630 is penetrated and coupled to the single through-hole.

[0398] The magnet part 740 forms a magnetic field that generates a magnetic force for guiding the arc generated from the chamber space 501. The arc path A.P can be formed in the chamber space 501 by the magnetic field formed by the magnet part 740.

[0399] The magnet part 740 may be provided in any form that can be magnetized and form a magnetic field. In one embodiment, the magnet part 740 may be provided by a permanent magnet or an electromagnet, etc.

[0400] The magnet part 740 is coupled to the magnet housing 710. Specifically, the magnet part 740 is retractably accommodated in the magnet space parts 711a, 712a, 713a, 714a of the magnet housing 710. Therefore, when maintenance or replacement of the magnet part 740 is required, the operator can separate and replace only the magnet part 740.

[0401] As described above, the magnet space portions 711a, 712a, 713a, and 714a are formed to penetrate in the thickness direction of the support walls 711, 712, 713, and 714. Accordingly, the magnet portion 740 may be disposed adjacent to the first to fourth walls 511, 512, 513, and 514 of the arc chamber 500.

[0402] A plurality of magnet portions 740 may be provided. The plurality of magnet portions 740 may be respectively accommodated in different magnet space portions 711a, 712a, 713a, and 714a to form a magnetic field. In the embodiment shown in FIG. 5, five magnet portions 740 are provided, including a first magnet 741, a second magnet 742, a third magnet 743, a fourth magnet 744, and a fifth magnet 745.

[0403] In the illustrated embodiment, the first to fifth magnets 741, 742, 743, 744, and 745 have a rectangular cross-section with a length in one direction longer than that in the other direction, and are provided in a rectangular plate shape extending in the vertical direction. The shapes of the first to fifth magnets 741, 742, 743, 744, and 745 may be any shape capable of forming a magnetic field in the chamber space 501.

[0404] The first magnet 741 is accommodated in the first magnet space portion 711a to form a magnetic field in the chamber space 501. The first magnet 741 includes a first magnet outer surface 741a which is one surface on the side opposite to the chamber space 501 and a first magnet inner surface 741b which is the other surface facing the chamber space 501. The first magnet outer surface 741a and the first magnet inner surface 741b can be magnetized with different polarities.

[0405] The second magnet 742 is accommodated in the second magnet space portion 712a to form a magnetic field in the chamber space 501. The second magnet 742 includes a second magnet outer surface 742a which is one surface on the side opposite to the chamber space 501 and a second magnet inner surface 742b which is the other surface facing the chamber space 501. The second magnet outer surface 742a and the second magnet inner surface 742b can be magnetized with different polarities.

[0406] The third magnet 743 is accommodated in the third magnet space portion 713a and forms a magnetic field in the chamber space 501. The third magnet 743 includes a third magnet outer surface 743a which is one surface on the side opposite to the chamber space 501 and a third magnet inner surface 743b which is the other surface facing the chamber space 501. The third magnet outer surface 743a and the third magnet inner surface 743b can be magnetized with different polarities from each other.

[0407] The fourth magnet 744 is accommodated in the fourth magnet space portion 714a and forms a magnetic field in the chamber space 501. The fourth magnet 744 includes a fourth magnet outer surface 744a which is one surface on the side opposite to the chamber space 501 and a fourth magnet inner surface 744b which is the other surface facing the chamber space 501. The fourth magnet outer surface 744a and the fourth magnet inner surface 744b can be magnetized with different polarities from each other.

[0408] The fifth magnet 745 is located between the fifth wall 515 and the cover member 715 and forms a magnetic field in the chamber space 501. The fifth magnet 745 is located between the first fixed contact 311 and the second fixed contact 312. The fifth magnet 745 includes a fifth magnet outer surface 745a which is one surface facing the first fixed contact 311 and a fifth magnet inner surface 745b which is the other surface facing the second fixed contact 312. The fifth magnet outer surface 745a and the fifth magnet inner surface 745b can be magnetized with different polarities from each other.

[0409] The first to fifth magnets 741, 742, 743, 744, 745 can form magnetic fields independently or together. A detailed description of the magnetic field formed by the magnet portion 740 and the direction of the magnetic force thereby will be described later.

[0410] The magnet cover member 750 couples the first to fourth support walls 711, 712, 713, 714 of the magnet housing 710 to the first to fourth walls 511, 512, 513, 514 of the arc chamber 500. The magnet cover member 750 stably maintains the coupling state between the magnet housing 710 and the magnet portion 740 coupled thereto and the arc chamber 500.

[0411] The magnet cover member 750 forms a radially outer portion of the arc induction portion 700. The magnet cover member 750 can cover other components of the arc induction portion 700 from the outside and be coupled to the magnet housing 710.

[0412] In the illustrated embodiment, the magnet cover member 750 covers two magnets 741, 742, 743, 744 arranged adjacent to each other and two support walls 711, 712, 713, 714 arranged adjacent to each other to which they are coupled, and is coupled to the magnet housing 710.

[0413] At the same time, the magnet cover member 750 covers a space formed between the two support walls 711, 712, 713, 714 (that is, a space formed with the two support walls 711, 712, 713, 714 spaced apart from each other), and is coupled to the magnet housing 710.

[0414] A plurality of magnet cover members 750 may be provided. The plurality of magnet cover members 750 include a first magnet cover member 750a located on the left side and a second magnet cover member 750b located on the right side.

[0415] The first magnet cover member 750a covers a part of the outside of the magnet housing 710 from one side of the magnet housing 710, on the left side in the illustrated embodiment. As described above, where the first magnet 741 and the third magnet 743 are relatively located on the left side, it can be said that the first magnet cover member 750a covers the first magnet 741 and the third magnet 743 located on the left side and is coupled to the magnet housing 710.

[0416] The second magnet member 750b covers another part of the outside of the magnet housing 710 from the other side of the magnet housing 710, on the right side in the illustrated embodiment. As described above, where the second magnet 742 and the fourth magnet 744 are relatively located on the right side, it can be said that the second magnet cover member 750b covers the second magnet 742 and the fourth magnet 744 located on the right side and is coupled to the magnet housing 710.

[0417] The magnet cover member 750 may be formed of an insulating material. In the above embodiment, the magnet portion 740 surrounded by the magnet cover member 750 is not affected by an external magnetic body or current, etc., and can form a magnetic field in the chamber space 501.

[0418] In the illustrated embodiment, the magnet cover member 750 includes a first extension portion 751, a second extension portion 752, and a third extension portion 753.

[0419] The first extension portion 751 forms a part of the magnet cover member 750. The first extension portion 751 may have a predetermined thickness and may be provided in a plate shape extending in one direction. In the embodiment shown in FIGS. 17 to 20, the first extension portion 751 is formed in a square plate shape.

[0420] The first extension portion 751 can cover one or more of the magnets in the magnet portion 740 and be coupled to the magnet housing 710. In the illustrated embodiment, the first extension portion 751 of the first magnet cover member 750a covers the first magnet 741 and is coupled to the magnet housing 710. Also, the first extension portion 751 of the second magnet cover member 750b covers the second magnet 742 and is coupled to the magnet housing 710.

[0421] The first extension portion 751 is continuous with the second extension portion 752 via the third extension portion 753.

[0422] The second extension portion 752 forms another part of the magnet cover member 750. The second extension portion 752 may have a predetermined thickness and may be provided in a plate shape extending in one direction. In the embodiment shown in FIGS. 17 to 20, the second extension portion 752 is formed in a square plate shape.

[0423] In one embodiment, the first extension portion 751 and the second extension portion 752 may be formed to have the same shape.

[0424] The second extension part 752 can cover one or more of the magnets in the magnet part 740 and be coupled to the magnet housing 710. In the illustrated embodiment, the second extension part 752 of the first magnet cover member 750a covers the third magnet 743 and is coupled to the magnet housing 710. Also, the second extension part 752 of the second magnet cover member 750b covers the fourth magnet 744 and is coupled to the magnet housing 710.

[0425] A third extension part 753 is provided between the first extension part 751 and the second extension part 752.

[0426] The third extension part 753 is coupled to the first extension part 751 and the second extension part 752 respectively. The first extension part 751 and the second extension part 752 can be continuous via the third extension part 753.

[0427] The third extension part 753 can be coupled to each end of the first extension part 751 and the second extension part 752. In the illustrated embodiment, the front end of the third extension part 753 is continuous with the rear end of the first extension part 751, and the rear end of the third extension part 753 is continuous with the front end of the second extension part 752.

[0428] The third extension part 753 may include at least one curved part. In the illustrated embodiment, the third extension part 753 includes one curved part formed to be round so as to be convex radially outward. The center of the curved part can be located inside the magnet housing 710. Also, the curvature of the curved part may be the same as the curvature of the corner where the mutually adjacent walls 511, 512, 513, 514 are continuous.

[0429] Therefore, when the magnet cover member 750 is coupled to the magnet housing 710, the first extension part 751 and the second extension part 752 respectively surround different magnets 741, 742, 743, 744 from each other, and the third extension part 753 surrounds the space formed therebetween.

[0430] Thereby, the coupling state of each component of the arc induction part 700 can be stably maintained.

[0431] As described above, the DC relay 10 according to the embodiment of the present invention can sufficiently secure the insulation distance between the main contact portion 300 and the sub-contact portion 400 due to the structural features of the arc chamber 500 and the arc induction portion 700. Thereby, even when the operation of the DC relay 10 proceeds, the electrical interference between the main contact portion 300 and the sub-contact portion 400 can be reduced. Further, damage to the sub-contact portion 400 caused by the arc generated from the main contact portion 300 can be minimized.

[0432] Also, the DC relay 10 according to the embodiment of the present invention is housed inside the arc chamber 500 while various components of the sub-contact portion 400 are housed in a separate contact holder 401. The portion where various components of the sub-contact portion 400 are exposed to the chamber space 501 can be minimized.

[0433] Therefore, damage to the components of the sub-contact portion 400 caused by the generated arc can be minimized. Thereby, the service life of the DC relay 10 can be increased.

[0434] Furthermore, the arc induction portion 700 for forming a magnetic field in the chamber space 501 is disposed outside the arc chamber 500. Therefore, it is possible to further secure the space occupied by the member for forming a magnetic field in the chamber space 501. As a result, the space in which the arc generated in the chamber space 501 can be extinguished and extended increases, and the arc extinguishing performance can be improved.

[0435] Hereinafter, with reference to FIGS. 21 to 25, the effects of the DC relay 10 according to the embodiment of the present invention will be described in detail.

[0436] Referring to FIG. 21, the insulation distance between the main contact portion 300 and the sub-contact portion 400 provided in the DC relay 10 according to the embodiment of the present invention is illustrated.

[0437] The main contact portion 300 is disposed offset from each other at a pair of vertices of the arc chamber 500 formed with a square cross section. At this time, the pair of vertices are arranged to face each other with the chamber space 501 therebetween. That is, the main contact portion 300 is disposed between a pair of vertices that are most distant from each other among the vertices of the arc chamber 500.

[0438] In the illustrated embodiment, the first fixed contact 311 is disposed offset from the vertex where the first wall 511 and the third wall 513 are continuous, which is located on the left side. Also, the second fixed contact 312 is disposed offset from the vertex where the second wall 512 and the fourth wall 514 are continuous, which is located on the right side. In other words, the first fixed contact 311 and the second fixed contact 312 are arranged spaced apart from each other in the left-right direction.

[0439] In the above embodiment, the first fixed contact 311 and the second fixed contact 312 may be disposed on the central axis A1 extending in the left-right direction of the chamber space 501.

[0440] The sub-contact portion 400 is disposed so as to extend between the other pair of vertices of the arc chamber 500 formed with a square cross section. At this time, the other pair of vertices are also arranged to face each other with the chamber space 501 therebetween. That is, the sub-contact portion 400 is disposed adjacent to the other pair of vertices that are most distant from each other among the vertices of the arc chamber 500.

[0441] In the illustrated embodiment, either one of the first leg 411 and the second leg 412 is disposed adjacent to the vertex where the first wall 511 and the second wall 512 are continuous, which is located on the front side. Also, the other one of the first leg 411 and the second leg 412 is disposed adjacent to the vertex where the third wall 513 and the fourth wall 514 are continuous, which is located on the rear side.

[0442] In the above embodiment, the first leg 411 and the second leg 412 may be disposed on the central axis A2 extending in the front-rear direction of the chamber space 501.

[0443] In one embodiment, the first leg 411 and the second leg 412 may be arranged to contact adjacent walls that surround a pair of opposite corners among the corners where the first to fourth walls 511, 512, 513, 514 are continuous with each other.

[0444] At this time, the distance between the first fixed contact 311 and any one of the first leg 411 and the second leg 412 can be defined as the first distance d1. Also, the distance between the second fixed contact 312 and the other one of the first leg 411 and the second leg 412 can be defined as the second distance d2.

[0445] In the illustrated embodiment, the first distance d1 and the second distance d2 may be formed longer than when the first fixed contact 311 and the second fixed contact 312 are arranged at other positions inside the chamber space 501. That is, as the first leg 411 and the second leg 412 in which a plurality of sub-PCBs 450, sub-connectors 460, and sub-switches 470 are respectively accommodated are maximally separated, the first distance d1 and the second distance d2 can also be maximized.

[0446] Thereby, a sufficient insulation distance can be ensured between the main contact portion 300 and the sub-contact portion 400.

[0447] Referring to FIGS. 22 and 23, an arc extinction region E.A formed inside the arc chamber 500 of the DC relay 10 according to an embodiment of the present invention is shown. The arc extinction region E.A can be defined as a space in the chamber space 501 where an arc can be extinguished and extended.

[0448] With the configuration as described above, the insulation distance between the main contact portion 300 and the sub-contact portion 400 is maximized, and at the same time, the arc extinction region E.A can be expanded compared to the conventional case.

[0449] Further, the magnet portion 740 for forming a magnetic field in the chamber space 501 is provided in the arc induction portion 700 disposed outside the arc chamber 500. The magnet portion 740 is configured to form a magnetic field in the chamber space 501 outside the arc chamber 500. Therefore, the arc extinguishing region E.A can be extended only by the space occupied by the magnet portion 740 in the chamber space 501.

[0450] As a result, the arc extinguishing region E.A is extended, the arc can be sufficiently extinguished and extended, and can be discharged outside the chamber space 501.

[0451] The above effect can be achieved without deforming the shape of the upper frame 110. That is, as the arc chamber 500 is formed to have a square cross section, a predetermined space is formed between the upper frame 110 and the arc chamber 500. The arc induction portion 700 is disposed in the space, that is, the space surrounded by the upper frame 110 and the arc chamber 500.

[0452] Therefore, a sufficient insulation distance is ensured between the main contact portion 300 and the sub-contact portion 400, and while the arc extinguishing region E.A of the arc increases, design changes to other components of the DC relay 10 can be minimized.

[0453] Referring to FIGS. 24 and 25, the magnetic field formed in the chamber space 501 of the DC relay 10 according to an embodiment of the present invention and the path A.P of the arc formed by the magnetic force thus formed are shown.

[0454] In the illustrated embodiment, the reference numeral JPEG0007709609000001.jpg8134 shown on the fixed contact 310 means that current is passed through the fixed contact 310 to the movable contact 320. That is, current is passed through the fixed contact 310 shown by JPEG0007709609000002.jpg7118 in a direction passing through the ground.

[0455] In the illustrated embodiment, the reference numeral JPEG0007709609000003.jpg7127 shown on the fixed contact 310 means that current is passed through the fixed contact 310 via the movable contact 320. That is, current is passed through the fixed contact 310 shown as JPEG0007709609000004.jpg7143 in a direction passing through the ground.

[0456] Also, in the illustrated embodiment, the solid arrows diverging from or converging to each of the magnets 741, 742, 743, 744, 745 mean the direction of the magnetic field formed by each of the magnets 741, 742, 743, 744, 745.

[0457] Referring to FIG. 24(a), the magnetic field formed inside the arc chamber 500 by the arc induction unit 700 and the path A.P of the arc thereby are shown. In the illustrated embodiment, current passes through the second fixed contact 312 and the movable contact 320 located on the right side in sequence and is passed outside via the first fixed contact 311 located on the left side.

[0458] In the above state, the outer surfaces 741a, 742a, 743a, 744a of the first to fourth magnets are magnetized with S poles. Also, the inner surfaces 741b, 742b, 743b, 744b of the first to fourth magnets are magnetized with N poles. Therefore, the direction of the magnetic field formed by the first to fourth magnets 741, 742, 743, 744 is a direction that diverges from the inner surfaces 741b, 742b, 743b, 744b of the first to fourth magnets and converges to the outer surfaces 741a, 742a, 743a, 744a of the first to fourth magnets.

[0459] Thereby, in the vicinity of the first fixed contact 311, a magnetic field in a direction toward the left side is formed, and in the vicinity of the second fixed contact 312, a magnetic field in a direction toward the right side is formed.

[0460] When applying Fleming's left hand's rule to the first fixed contact 311, the direction of the magnetic force formed by the current and the magnetic field is formed towards the left side in the front. As a result, the arc path A.P is also formed towards the left side in the front and can proceed in a direction away from the fixed contact 310 and the sub-contact portion 400.

[0461] When applying Fleming's left hand's rule to the second fixed contact 312, the direction of the magnetic force formed by the current and the magnetic field is formed towards the right side in the front. As a result, the arc path A.P is also formed towards the right side in the front and can proceed in a direction away from the fixed contact 310 and the sub-contact portion 400.

[0462] Referring to Fig. 24(b), an embodiment in which the current conduction direction is changed is shown. In the illustrated embodiment, the current passes through the first fixed contact 311 located on the left side and the movable contact 320 in sequence and is energized externally through the second fixed contact 312 located on the right side.

[0463] At this time, the polarities of the magnets 741, 742, 743, 744 and the direction of the magnetic field formed thereby are the same as those in the embodiment shown in Fig. 24(a).

[0464] When applying Fleming's left hand's rule to the first fixed contact 311, the direction of the magnetic force formed by the current and the magnetic field is formed towards the left side in the front. As a result, the arc path A.P is also formed towards the left side in the front and can proceed in a direction away from the fixed contact 310 and the sub-contact portion 400.

[0465] Applying Fleming's left - hand rule to the second fixed contact 312, the direction of the magnetic force formed by the current and the magnetic field is formed towards the right side at the rear. As a result, the arc path A.P is also formed towards the right side at the rear and can proceed in a direction away from the fixed contact 310 and the sub - contact portion 400.

[0466] Referring to Fig. 25(a), in the embodiment where the fifth magnet 745 is added, the magnetic field formed inside the arc chamber 500 by the arc induction portion 700 and the arc path A.P thereby are shown. In the illustrated embodiment, the current passes through the second fixed contact 312 located on the right side and the movable contact 320 in sequence and is energized externally through the first fixed contact 311 located on the left side.

[0467] In the above state, the outer surfaces 741a, 742a, 743a, 744a of the first to fourth magnets are magnetized with the S - pole. Also, the inner surfaces 741b, 742b, 743b, 744b of the first to fourth magnets are magnetized with the N - pole. Furthermore, the outer surface 745a of the fifth magnet is magnetized with the N - pole, and the inner surface 745b of the fifth magnet is magnetized with the S - pole.

[0468] Therefore, the direction of the magnetic field formed by the first to fourth magnets 741, 742, 743, 744 is a direction that diverges from the inner surfaces 741b, 742b, 743b, 744b of the first to fourth magnets and converges to the outer surfaces 741a, 742a, 743a, 744a of the first to fourth magnets. Also, the direction of the magnetic field formed by the fifth magnet 745 is a direction that diverges from the outer surface 745a of the fifth magnet and converges to the inner surface 745b of the fifth magnet.

[0469] Furthermore, as the fifth magnet 745 is provided, a magnetic field is also formed between the first to fifth magnets 741, 742, 743, 744, 745.

[0470] Specifically, a magnetic field is formed in the direction from the outer surface 745a of the fifth magnet towards the outer surfaces 741a, 743a of the first and third magnets. Also, a magnetic field is formed in the direction from the inner surfaces 742b, 744b of the second and fourth magnets towards the inner surface 745b of the fifth magnet.

[0471] As a result, a magnetic field in the leftward direction is formed in the vicinity of the first fixed contact 311 and in all of the second fixed contacts 312.

[0472] When applying Fleming's left hand's rule to the first fixed contact 311, the direction of the magnetic force formed by the current and the magnetic field is formed toward the left side in the front. As a result, the arc path A.P is also formed toward the left side in the front and can proceed in a direction away from the fixed contact 310 and the sub-contact portion 400.

[0473] When applying Fleming's left hand's rule to the second fixed contact 312, the direction of the magnetic force formed by the current and the magnetic field is formed toward the right side in the rear. As a result, the arc path A.P is also formed toward the right side in the rear and can proceed in a direction away from the fixed contact 310 and the sub-contact portion 400.

[0474] Referring to FIG. 25(b), an embodiment in which the energization direction of the current is changed is shown. In the illustrated embodiment, the current sequentially passes through the first fixed contact 311 located on the left side and the movable contact 320, and is energized to the outside through the second fixed contact 312 located on the right side.

[0475] At this time, the polarities of the magnets 741, 742, 743, 744, 745 and the direction of the magnetic field formed thereby are the same as those in the embodiment shown in FIG. 25(a).

[0476] When applying Fleming's left hand's rule to the first fixed contact 311, the direction of the magnetic force formed by the current and the magnetic field is formed toward the left side in the rear. As a result, the arc path A.P is also formed toward the left side in the rear and can proceed in a direction away from the fixed contact 310 and the sub-contact portion 400.

[0477] When applying Fleming's left - hand rule to the second fixed contact 312, the direction of the magnetic force formed by the current and the magnetic field is formed towards the right side at the rear. As a result, the arc path A.P is also formed towards the right side at the rear and can proceed in a direction away from the fixed contact 310 and the sub - contact portion 400.

[0478] Therefore, the DC relay 10 according to the embodiment of the present invention can induce the generated arc in a direction away from the fixed contact 310 and the sub - contact portion 400. Thereby, damage to the fixed contact 310 and the sub - contact portion 400 caused by the generated arc can be minimized.

[0479] Also, even if the direction of the current flowing through the fixed contact 310 and the movable contact 320 is changed, the arc is induced in a direction away from the fixed contact 310 and the sub - contact portion 400. Therefore, an operator or user can connect an external power source and a load without considering the polarity of the fixed contact 310 and the main terminal 610 coupled to and energized by it, and workability and convenience can be improved.

[0480] Although the embodiments of the present invention have been described, the idea of the present invention is not limited by the embodiments presented in this specification. Those skilled in the art who understand the idea of the present invention can easily propose other embodiments by adding, changing, deleting, adding components, etc. within the scope of the same idea, and this can also be said to be within the scope of the idea of the present invention.

Explanation of Reference Numerals

[0481] 10: DC relay 100: Frame 110: Upper frame 111: Upper space 112: Coupling protrusion 113: Support protrusion 114: Upper opening 115: Upper separation wall 120: Lower frame 121: Lower space 122: Coupling groove 123: PCB receiving portion 130: PCB frame 131: PCB 140: Support plate 141: Support groove 142: Support through-hole 150: First insulating plate 151: Holder support part 152: Holder through-hole 200: Core part 210: Fixed core 220: Movable core 230: Yoke 240: Bobbin 250: Coil 251: Trip coil 252: Holding coil 260: Core spring 270: Yoke ring 280: Cylinder 300: Main contact part 310: Fixed contact 311: First fixed contact 312: Second fixed contact 320: Movable contact 330: Housing 340: Cover 350: Contact spring 360: Shaft 400: Sub-contact part 401: Contact holder 410: Body part 411: First leg 412: Second leg 413: Bridge 420: Switch receiving part 421: First switch receiving part 422: Second switch receiving part 430: Terminal receiving part 431: First terminal receiving part 432: Second terminal receiving part 440: Terminal partitioning member 441: First terminal partitioning member 442: Second terminal partitioning member 450: Sub-PCB 451: First sub-PCB 451: Second sub-PCB 460: Sub-connector 461: First sub-connector 462: Second sub-connector 470: Sub-switch 471: First sub-switch 472: Second sub-switch 500: Arc chamber 501: Chamber space 510: Wall part 511: First wall 512: Second wall 513: Third wall 514: Fourth wall 515: Fifth wall 520: Opening 521: Main opening 521a: First main opening 521b: Second main opening 522: Sub-opening 522a: First sub-opening 522b: Second sub-opening 523: Pipe opening 530: Seal member 600: Terminal part 610: Main terminal 611: First main terminal 612: Second main terminal 620: Sub-terminal 621: First sub-terminal 622: Second sub-terminal 630: Pipe member 700: Arc induction part 710: Magnet housing 711: First support wall 711a: First magnet space part 712: Second support wall 712a: Second magnet space part 713: Third support wall 713a: Third magnet space part 714: Fourth support wall 714a: Fourth magnet space part 715: Cover member 720: Arc opening 721: First arc opening 722: Second arc opening 723: Conductor receiving part 724: Conductor groove 730: Second insulating plate 740: Magnet part 741: First magnet 741a: First magnet outer surface 741b: First magnet inner surface 742: Second magnet 742a: Second magnet outer surface 742b: Second magnet inner surface 743: Third magnet 743a: Third magnet outer surface 743b: Third magnet inner surface 744: Fourth magnet 744a: Fourth magnet outer surface 744b: Fourth magnet inner surface 745: Fifth magnet 745a: Fifth magnet outer surface 745b: Fifth magnet inner surface 750: Magnet cover member 750a: First magnet cover member 750b: Second magnet cover member 751: First extension part 752: Second extension part 753: Third extension part S: Accommodation space W: Conductor member d1: First distance d2: Second distance E.A: Arc extinction region A.P: Arc path

Claims

1. A body portion having spaces formed therein that are spaced apart from each other; and A plurality of sub-connectors respectively accommodated in the spaces of the body portion and electrically connected to an external control power source and a core portion, The body portion is,[ A plurality of legs (legs) having the spaces formed therein that are spaced apart from each other and extending in one direction; and A sub-contact portion including a bridge extending between the plurality of legs and coupled to the plurality of legs respectively.

2. The plurality of legs are,[ An upper end thereof is continuous with the bridge, A lower end thereof is supported by an external insulating plate, The sub-contact portion according to claim 1.

3. The space of the body portion is,[ A switch receiving portion recessed in the one direction, having one side open, and accommodating a sub-switch in a drawable manner; and The sub-contact portion according to claim 1, including a terminal receiving portion recessed in the one direction, having the one side open, and accommodating the sub-connector in a drawable manner.

4. Including a terminal partitioning member located in the terminal receiving portion and partitioning the terminal receiving portion into a plurality of spaces, The plurality of sub-connectors are,[ Respectively accommodated in the plurality of spaces partitioned by the terminal receiving portion, The sub-contact portion according to claim 3.

5. One side of the switch receiving portion and one side of the terminal receiving portion communicate with each other, and a space for accommodating a sub-PCB in a drawable manner is formed, The sub-contact portion according to claim 3.

6. A sub-PCB electrically connected to the sub-connector; and Including a sub-switch electrically connected to the sub-PCB, The sub-contact portion according to claim 1.

7. A plurality of legs having a space formed therein and extending in the vertical direction; A bridge extending between the plurality of legs; Defined as a part of a space recessed downward from the upper ends of the plurality of legs and accommodating a sub-switch electrically connected to an external control power source and a core portion; and Defined as another part of a space recessed downward from the upper ends of the plurality of legs, partially separated from the switch receiving portion, and including a terminal receiving portion accommodating a sub-connector electrically connected to the sub-switch. Above the switch receiving portion and the terminal receiving portion, there is a space that communicates with each other and forms a space for accommodating a sub-PCB that is respectively coupled to the sub-switch and the sub-connector and is energized, which is a sub-contact portion.

8. A fixed contact for energizing an external power source or load; A movable contact provided so as to be movable up and down and contacting or separating from the fixed contact; An arc chamber in which a chamber space for accommodating the fixed contact and the movable contact is formed; and Including a core portion accommodated in the chamber space and coupled to the movable contact and a sub-contact portion for energizing an external control power source, A plurality of the fixed contacts are provided and are arranged at intervals along one direction in the chamber space, The sub-contact portion extends along another direction forming a predetermined angle with the one direction, and one end portion and the other end portion along the another direction are formed so as to face each other with the fixed contact therebetween, A DC relay in which a plurality of sub-connectors for energizing the core portion and the external control power source are respectively accommodated at the one end portion and the other end portion of the sub-contact portion.

9. The arc chamber is A pair of walls that horizontally surround the chamber space and are arranged to face each other with the chamber space therebetween; and Including another pair of walls that horizontally surround the chamber space and are arranged to face each other with the chamber space therebetween and are continuous with the pair of walls respectively, One end portion of the sub-contact portion is located adjacent to a corner where the pair of walls and the other pair of walls are continuous with each other, The DC relay according to claim 8, wherein the other end portion of the sub-contact portion is located adjacent to another corner where the pair of walls and the other pair of walls are continuous with each other.

10. A part of the outer surface of the one end portion contacts the corner, The DC relay according to claim 9, wherein a part of the outer surface of the other end portion contacts the other corner.

11. The sub-contact portion is A first leg that forms the one end portion and extends by a predetermined height; A second leg that forms the other end portion and extends by the predetermined height; The DC relay according to claim 8, including a bridge that extends along the another direction between the first leg and the second leg.

12. Inside the first leg and the second leg, One side is open, and a plurality of switch receiving portions are respectively recessed on the upper surfaces of the first leg and the second leg to respectively accommodate a plurality of sub - switches; One side is open, and a plurality of terminal receiving portions are respectively recessed on the upper surfaces of the first leg and the second leg to respectively accommodate a plurality of the sub - connectors; and One side of the plurality of switch receiving portions and one side of the plurality of terminal receiving portions communicate with each other to form a plurality of spaces for respectively accommodating a plurality of sub - PCBs that are respectively coupled to the sub - switches and the sub - connectors for energization. The DC relay according to claim 11.

13. The DC relay according to claim 11, comprising an insulating plate located outside the arc chamber and supporting the sub - contact portion.

14. The insulating plate extends in a direction toward the arc chamber and includes a holder support portion that supports one ends of the first leg and the second leg in a radial direction. The holder support portion includes at least one bent portion and is configured to support the one ends of the first leg and the second leg in a plurality of directions. The DC relay according to claim 13.

15. An upper frame that houses the arc chamber, the insulating plate, and the sub - contact portion; and The DC relay according to claim 14, comprising a lower frame coupled to the upper frame and accommodating the core portion in a vertically movable manner.

16. The chamber space is formed to have a cross - section in a shape of a quadrilateral with the one direction and the other direction being diagonal directions respectively. The DC relay according to claim 8.

17. The chamber space is formed with a cross - section in a shape of a rhombus, and an extended length of one diagonal along the one direction is less than or equal to an extended length of the other diagonal along the other direction. The DC relay according to claim 16.

18. One end and the other end of the sub - contact portion are formed to have a predetermined height, and the arc chamber is formed such that one side is closed along the height direction of one end and the other end of the sub - contact portion to cover one end and the other end of the sub - contact portion. The DC relay according to claim 8.

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