Detachment device, circuit breaker, and distribution board

Abstract

To provide a detachment device in which detachment force generated by moving a movable iron piece toward a fixed iron piece is high, a circuit breaker, and a distribution board.SOLUTION: A detachment device 1 includes: a fixed iron piece 11; a movable iron piece 12; and a pushing portion 14. The movable iron piece 12 is configured to move toward the fixed iron piece 11 when abnormality occurs. The pushing portion 14 interlocks with the movable iron piece 12 that moves toward the fixed iron piece 11 and pushes a latch unit 3 from a latch position to a non-latch position. The movable iron piece 12 has a second surface X2 opposed to a first surface X1 of the fixed iron piece 11. The movable iron piece 12 is configured such that the second surface X2 is kept in parallel to the first surface X1 while moving toward the fixed iron piece 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure generally relates to a trip device, a circuit breaker, and a distribution board. More particularly, the present disclosure relates to a trip device, a circuit breaker, and a distribution board that open contacts when an abnormality occurs. [Background technology]

[0002] Patent Document 1 describes a circuit breaker in which an overcurrent tripping unit accommodating chamber, a switching mechanism unit accommodating chamber, an arc barrier accommodating chamber, and a contact unit accommodating chamber are formed within a housing. The overcurrent tripping unit accommodating chamber accommodates the overcurrent tripping unit and is located between the load side terminal unit and the switching mechanism unit accommodating chamber. The switching mechanism unit accommodating chamber is located between the overcurrent tripping unit accommodating chamber and the power supply side terminal unit. The arc barrier accommodating chamber is located between the power supply side terminal unit and the load side terminal unit, and is located below the overcurrent tripping unit accommodating chamber and the switching mechanism unit accommodating chamber. The contact unit accommodating chamber is located at the end of the arc barrier accommodating chamber on the power supply side terminal unit side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-77423 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, a tripping device such as the overcurrent tripping unit of the circuit breaker described in Patent Document 1 may be configured to have a fixed iron piece and a movable iron piece instead of an electromagnet, and to open the contacts by moving the movable iron piece toward the fixed iron piece when an abnormality occurs. In this case, the tripping device is required to have a high tripping force generated by moving the movable iron piece toward the fixed iron piece.

[0005] An object of the present disclosure is to provide a tripping device, a circuit breaker, and a distribution board that generate a high tripping force by moving a movable iron piece toward a fixed iron piece. [Means for solving the problem]

[0006] A tripping device according to one aspect of the present disclosure is a tripping device that, when an abnormality occurs in power supplied from an external power source to a load via a contact portion, opens the contact portion by moving the latch portion from a latched position to a non-latched position. The tripping device includes a fixed iron piece, a movable iron piece, and a pushing portion. The movable iron piece is configured to move toward the fixed iron piece when the abnormality occurs. The pushing portion is linked to the movable iron piece moving toward the fixed iron piece, and pushes the latch portion from the latched position to the non-latched position. The movable iron piece has a second surface that faces a first surface of the fixed iron piece. The movable iron piece is configured such that the second surface remains parallel to the first surface while moving toward the fixed iron piece.

[0007] A circuit breaker according to an embodiment of the present disclosure includes the tripping device, a first terminal unit, a second terminal unit, the contact unit, and the latch unit. The first terminal unit is electrically connected to the external power supply. The second terminal unit is electrically connected to the load. The contact unit is inserted into an electric path between the first terminal unit and the second terminal unit. The latch unit opens the contact unit by being pushed from the latch position to the non-latch position by the push-in unit.

[0008] A distribution board according to one aspect of the present disclosure includes the circuit breaker and a cabinet that houses the circuit breaker. Effect of the Invention

[0009] According to the present disclosure, there is an advantage that a high pulling force is generated by the movement of the movable iron piece toward the fixed iron piece. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view of a circuit breaker according to the present embodiment with a first block removed, showing a state in which the contact portion is closed. [Diagram 2] FIG. 2 is a plan view of the circuit breaker with the first block removed, showing the contact portion in an open state. [Diagram 3] FIG. 3 is a plan view of the circuit breaker according to the comparative example with a part of the first block omitted, showing the contact portion in a closed state. [Figure 4] FIG. 4 is an external view of a distribution board including the circuit breaker of the above embodiment. [Diagram 5] FIG. 5 is a perspective view of the circuit breaker. [Figure 6] FIG. 6 is an external perspective view of a tripping device in the circuit breaker. [Figure 7] Fig. 7A is a plan view of a main part including a tripping device in the circuit breaker shown in Fig. 1. Fig. 7B is a plan view of a main part including a tripping device in the circuit breaker shown in Fig. 2. [Figure 8] FIG. 8 is an explanatory diagram illustrating a change in tripping force depending on the amount of movement of a push-in portion of a tripping device in the circuit breaker. [Figure 9] FIG. 9 is a plan view of the essential parts of the circuit breaker according to the first modification with the first block removed, showing the contacts in a closed state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The embodiments and modifications described below are merely examples of the present disclosure. The present disclosure is not limited to the embodiments and modifications, and various modifications can be made according to the design, etc., without departing from the technical ideas of the present disclosure. The figures described in the following embodiments and modifications are schematic diagrams, and the ratios of the sizes and thicknesses of the components in the figures do not necessarily reflect the actual dimensional ratios.

[0012] (Present embodiment) (1) Overview An overview of a tripping device 1 according to this embodiment will now be described with reference to FIGS. 1 to 3. FIG.

[0013] The tripping device 1 of this embodiment is provided inside the circuit breaker 10, and when an abnormality occurs in the power supplied from an external power source to a load via the contact unit 2, the contact unit 2 is opened by moving the latch unit 3 from the latched position to the non-latched position.

[0014] The "latched position" in this disclosure is a position where the latch portion 3 closes the contact portion 2, as shown in Fig. 1. On the other hand, the "non-latched position" in this disclosure is a position where the latch portion 3 opens the contact portion 2, as shown in Fig. 2.

[0015] 1 and 2, the tripping device 1 includes a fixed iron piece 11, a movable iron piece 12, and a pushing portion 14. The movable iron piece 12 is configured to move toward the fixed iron piece 11 when an abnormality occurs in the power supplied from an external power source to a load via the contact portion 2. The pushing portion 14 moves in conjunction with the movable iron piece 12 moving toward the fixed iron piece 11, and pushes the latch portion 3 from the latched position to the non-latched position.

[0016] The movable iron piece 12 has a second surface X2 that faces the first surface X1 of the fixed iron piece 11. The movable iron piece 12 is configured so that the second surface X2 remains parallel to the first surface X1 while moving toward the fixed iron piece 11. In this disclosure, "parallel" is not limited to being strictly parallel, and a slight error (e.g., ±2 degrees) is allowed.

[0017] As shown in FIG. 3, in the tripping device A1 of the circuit breaker A10 according to the comparative example, the second surface AX2 of the movable iron A12 is not provided parallel to the first surface AX1 of the fixed iron A11, and while the movable iron A12 moves toward the fixed iron A11, the second surface AX2 approaches the first surface AX1 while rotating about the center point P1. That is, while the movable iron A12 moves toward the fixed iron A11, the clearance between the fixed iron A11 and the movable iron A12 is not uniform. Therefore, the force with which the fixed iron A11 attracts the movable iron A12 (hereinafter, also referred to as "attraction force") varies depending on the part of the movable iron A12 where the attraction force acts. More specifically, the attraction force acting on a part of the movable iron A12 far from the center point P1 is weaker than the attraction force acting on a part of the movable iron A12 close to the center point P1. As a result, the tripping device A1 of the circuit breaker A10 according to the comparative example may have a problem in that it is unable to exert a sufficient attractive force when the movable iron piece A12 starts to move toward the fixed iron piece A11.

[0018] However, in the tripping device 1 of the circuit breaker 10 of this embodiment, the movable iron piece 12 is configured so that the second surface X2 is kept parallel to the first surface X1 while it is moving toward the fixed iron piece 11. In other words, the clearance between the fixed iron piece 11 and the movable iron piece 12 is configured to be uniform while the movable iron piece 12 is moving toward the fixed iron piece 11. Therefore, the magnitude of the attractive force with which the fixed iron piece 11 attracts the movable iron piece 12 is approximately uniform, independent of the location of the movable iron piece 12 on which the attractive force acts. Therefore, even in a state where the movable iron piece 12 starts to move toward the fixed iron piece 11 (hereinafter also referred to as the "initial state"), the attractive force can be sufficiently exerted. As a result, in the initial state, the moving speed of the movable iron piece 12 becomes faster, and the pushing portion 14 linked to the movable iron piece 12 strongly pushes the latch portion 3. That is, the tripping device 1 of this embodiment has an advantage over the tripping device A1 of the circuit breaker A10 according to the comparative example in that the tripping force generated by the movement of the movable iron piece 12 toward the fixed iron piece 11 is higher. The "tripping force" in this disclosure refers to the force with which the latch portion 3 separates the contact portion 2, that is, the force with which the contact portion 2 opens.

[0019] (2) Detailed configuration Hereinafter, detailed configurations of the trip device 1, the circuit breaker 10, and the distribution board 100 according to this embodiment will be described with reference to Figs.

[0020] (2-1) Distribution board 4, the distribution board 100 according to this embodiment includes a main breaker 91, a plurality of (12 in the illustrated example) branch breakers 92, a cabinet 93, and an outer cover (not illustrated). In this embodiment, each of the plurality of branch breakers 92 is a circuit breaker 10. The distribution board 100 is installed, for example, in a house (or a non-house).

[0021] The cabinet 93 is made of, for example, synthetic resin. As shown in Fig. 4, the cabinet 93 is formed in a box shape with an open front, and is attached to a wall of a house or the like when used. The cabinet 93 houses a main breaker 91 and a plurality of branch breakers 92 (circuit breakers 10). More specifically, the cabinet 93 has a space for housing the main breaker 91 and the plurality of branch breakers 92 (circuit breakers 10). The outer lid is attached to the cabinet 93 in a state in which it can move between a position that closes the front of the cabinet 93 and a position that opens it.

[0022] The main breaker 91 has a primary terminal and a secondary terminal. An external power source is electrically connected to the primary terminal of the main breaker 91. The "external power source" in the present disclosure is a power source that supplies power to a load, for example, a system power source (commercial power source). In the distribution board 100 according to the present embodiment, a single-phase three-wire system is assumed as the power distribution method, and therefore, a single-phase three-wire system lead-in line of the system power source (commercial power source) is electrically connected to the primary terminal of the main breaker 91. That is, in the present embodiment, the main breaker 91 has two voltage poles and one neutral pole. Each circuit breaker 10 is electrically connected to the secondary terminal of the main breaker 91.

[0023] The circuit breakers 10 are arranged in a line in the left-right direction, with a plurality of circuit breakers (six in the illustrated example) on each side above and below the conductive bar of the neutral pole. Each circuit breaker 10 has a primary terminal and a secondary terminal.

[0024] A secondary terminal of a main breaker 91 is electrically connected to a primary terminal of the circuit breaker 10. In short, an external power source is electrically connected to the primary terminal of the circuit breaker 10 via the main breaker 91. Furthermore, one or more loads are electrically connected to the secondary terminal of the circuit breaker 10. In this disclosure, the term "load" includes not only electrical equipment such as lighting fixtures and hot water supply equipment, but also wiring devices such as electrical outlets and wall switches. Details of the circuit breaker 10 will be described in the section "(2-2) Circuit breaker."

[0025] (2-2) Circuit breaker (2-2-1) Overall Structure As shown in Figures 1 and 2, the circuit breaker 10 includes a tripping device 1, a contact portion 2, a latch portion 3 (operating handle 6, etc.), a bimetal plate 4, a body 5, a pair of terminal portions 7, a fixed contact plate 81, a braided wire 82, a metal plate 83, and an arc extinguishing device 84.

[0026] The circuit breaker 10 has a function (overcurrent detection function) of detecting an overcurrent such as a short circuit current or an overload current, and switching the contact unit 2 from closed to open to cut off current flow from an external power source to a load (current flow through the main circuit). The circuit breaker 10 is also configured to be able to switch the contact unit 2 from closed to open and from open to closed in response to a manual operation of the operation handle 6. For example, after the contact unit 2 is opened due to detection of an abnormal current, the user can close the contact unit 2 by operating the operation handle 6 when safety is confirmed. The main circuit of this embodiment is an electric path for power supplied from an external power source to a load, and is an electric path between a first terminal unit 7A and the other second terminal unit 7B of a pair of terminal units 7, which will be described later. The main circuit is composed of a fixed contact plate 81, a latch unit 3, a braided wire 82, a bimetal plate 4, a metal plate 83, and the like.

[0027] (2-2-2) Body As shown in FIG. 5, the body 5 has a generally flat, generally rectangular box shape. Hereinafter, the direction along the thickness direction of the body 5 may be referred to as the "left-right direction" of the circuit breaker 10. Hereinafter, the direction in which the pair of terminals 7 are arranged, as shown in FIG. 1, will be referred to as the "up-down direction", and the downward direction when the circuit breaker 10 is viewed from the front will be referred to as the "downward direction". Also, the right side when the circuit breaker 10 is viewed from the front will be referred to as the "right side", and the left side when the circuit breaker 10 is viewed from the front will be referred to as the "left side". Furthermore, the direction perpendicular to both the up-down direction and the left-right direction will be referred to as the "front-rear direction", and the side where the operating handle 6 is provided on the body 5 will be referred to as the "front". However, these directions are not intended to limit the direction in which the circuit breaker 10 is used.

[0028] 5, the body 5 has a first block 5A (right block) and a second block 5B (left block). The first block 5A and the second block 5B are made of an electrically insulating synthetic resin material.

[0029] The housing 5 accommodates therein the tripping device 1, the contact portion 2, the latch portion 3, the bimetal plate 4, the operating handle 6, the pair of terminal portions 7, the fixed contact plate 81, the braided wire 82, the metal plate 83, and the arc extinguishing device 84. As shown in Figs. 1 to 2 and 5, the housing 5 supports a part of the operating handle 6 (the lever 61) so as to be exposed to the outside from its front wall 55. As shown in Fig. 5, the front wall 55 protrudes forward so that its central portion in the up-down direction is convex, and the lever 61 is exposed to the outside from a window hole 56 in the protruding central portion.

[0030] The first block 5A and the second block 5B are formed into a generally rectangular box shape with open faces facing each other. The housing 5 is formed by joining the first block 5A and the second block 5B together by butting them together.

[0031] (2-2-3) Terminal section As shown in FIG. 1 and FIG. 2, one of the pair of terminals 7, the first terminal 7A, is accommodated in the upper end of the housing 5, and the other, the second terminal 7B, is accommodated in the upper end of the housing 5. In the following description, it is assumed that an electric wire on the external power source side (e.g., a commercial AC power source) is electrically connected to the first terminal 7A, and an electric wire on the load side is electrically connected to the second terminal 7B. That is, it is assumed that the first terminal 7A is the above-mentioned primary side terminal to which the secondary side terminal of the main breaker 91 is electrically connected, and the second terminal 7B is the above-mentioned secondary side terminal to which the load is electrically connected. Note that the first terminal 7A may be electrically connected to the electric wire on the load side, and the second terminal 7B may be electrically connected to the electric wire on the external power source side.

[0032] The first terminal portion 7A and the second terminal portion 7B are, for example, so-called pillar terminals (screw-type terminals) that can be connected by screws. As shown in Fig. 1, the first terminal portion 7A has a terminal plate 71, a terminal metal fitting 72, and a terminal screw 73. The second terminal portion 7B has the terminal metal fitting 72 and the terminal screw 73.

[0033] Terminal board 71 is made of a conductive metal plate and is formed into a generally L-shaped plate shape. Terminal board 71 is fixed inside housing 5.

[0034] The terminal fitting 72 is formed in a rectangular tube shape by a conductive metal plate. The terminal fitting 72 has an axis in the vertical direction, and both ends in the vertical direction are open. The terminal fitting 72 of the first terminal part 7A is movable within a predetermined range in the front-rear direction in the case 5 with a part (projection piece 711) of the terminal board 71 inserted therein. On the other hand, the terminal fitting 72 of the second terminal part 7B is movable within a predetermined range in the front-rear direction in the case 5 with a part (projection piece 811) of the fixed contact plate 81 inserted therein. The terminal fitting 72 has a screw hole into which the terminal screw 73 is screwed. The case 5 has an insertion port 51 (two in total) for inserting an electric wire at a portion that overlaps with the gap between the projection piece 711 (or projection piece 811) and the bottom wall of the terminal fitting 72 when viewed from the vertical direction.

[0035] Terminal screws 73 are housed in housing 5 with their screw tips screwed into screw holes in terminal fittings 72. Housing 5 has holes 52 (two in total) at portions of front wall 55 that overlap with the heads of terminal screws 73 when viewed from the front-to-rear direction, through which terminal screws 73 can be exposed without falling off.

[0036] In the first terminal portion 7A, with the electric wire on the external power source side inserted from the socket 51 into the gap between the protruding piece 711 and the bottom wall of the terminal fitting 72, the tip of a tool such as a screwdriver is inserted through the hole portion 52 and the terminal screw 73 is tightened, so that the terminal fitting 72 moves forward and the distance between the protruding piece 711 and the bottom wall of the terminal fitting 72 is shortened. As a result, the electric wire on the external power source side that was inserted into the gap can be connected to the terminal portion 7.

[0037] Similarly, in the second terminal portion 7B, with the electric wire on the load side inserted from the insertion port 51 into the gap between the protruding piece 811 and the bottom wall of the terminal fitting 72, the tip of a tool such as a screwdriver is inserted through the hole portion 52 and the terminal screw 73 is tightened, so that the terminal fitting 72 moves forward and the distance between the protruding piece 811 and the bottom wall of the terminal fitting 72 is shortened. As a result, the electric wire on the load side that was inserted into the gap can be connected to the terminal portion 7.

[0038] (2-2-4) Contact part The contact unit 2 is configured to open when an abnormality occurs in the power supplied from the external power source to the load via the contact unit 2. More specifically, the contact unit 2 is configured to open in response to the occurrence of an abnormal current (here, as an example, a leakage current, a short circuit current, and an overload current) in the main circuit, and switch the main circuit from a conducting state to a cut-off state. The contact unit 2 is inserted in the electric path between the first terminal unit 7A and the second terminal unit 7B.

[0039] 1 and 2, the contact unit 2 has a fixed contact 2A and a movable contact 2B that comes into contact with or separates from the fixed contact 2A. Fig. 1 shows the contact unit 2 in a closed state, and Fig. 2 shows the contact unit 2 in an open state.

[0040] The fixed contact 2A is provided on a fixed contact plate 81. More specifically, the fixed contact 2A is a recess provided on the fixed contact plate 81. The fixed contact plate 81 is made of a low resistance material such as iron or copper. The fixed contact plate 81 constitutes a part of the main circuit.

[0041] The movable contact 2B is located at one end of an arm 31 (movable contactor) of the latch portion 3 formed by punching and bending a metal plate. The movable contact 2B is integrated as a part of the arm 31. However, the movable contact 2B may be a separate member from the arm 31 and fixed to one end of the arm 31. The arm 31 constitutes a part of the main circuit.

[0042] Arm 31 is rotatable about shaft 32 provided at the other end thereof between a position where movable contact 2B contacts fixed contact 2A and a position where movable contact 2B is separated from fixed contact 2A. One end of braided wire 82 is fixed to the middle part of arm 31. Braided wire 82 constitutes a part of the main circuit.

[0043] The other end of the braided wire 82 is fixed to the middle part of the bimetal plate 4. An end (rear end) of the bimetal plate 4 is fixed to one end of a metal plate 83, and the other end of the metal plate 83 is fixed to the terminal plate 71 of the first terminal portion 7A. The bimetal plate 4 and the metal plate 83 form a part of the main circuit.

[0044] With the contact portion 2 in a closed state, the power supplied (output) from the external power source to the first terminal portion 7A passes through the main circuit and is supplied (input) to the load from the second terminal portion 7B. More specifically, the power output from the external power source to the first terminal portion 7A passes through the main circuit in the listed order of the metal plate 83, the bimetal plate 4, the braided wire 82, the latch portion 3, and the fixed contact plate 81, and is input to the load from the second terminal portion 7B.

[0045] (2-2-5) Latch section The latch unit 3 is configured to open or close the contact unit 2 in response to an opening operation (OFF operation) or a closing operation (ON operation). More specifically, the latch unit 3 is configured to hold one of a state in which the movable contact 2B is in contact with the fixed contact 2A and a state in which the movable contact 2B is separated from the fixed contact 2A in response to an opening operation or a closing operation. When the latch unit 3 is in the latched position (see FIG. 1), the latch unit 3 closes the contact unit 2, that is, holds the state in which the movable contact 2B is in contact with the fixed contact 2A. On the other hand, when the latch unit 3 is in the non-latching position (see FIG. 2), the latch unit 3 opens the contact unit 2, that is, holds the state in which the movable contact 2B is separated from the fixed contact 2A.

[0046] The latch unit 3 has an operating handle 6, a plurality of latch members 30, and an arm 31. The operating handle 6 is rotatably supported by the body 5 with a lever (operating knob) 61 protruding to the outside of the body 5 from a window hole 56 (see FIG. 5) provided in a front wall 55 of the body 5. Each latch member 30 connects the operating handle 6 and the arm 31, and moves the arm 31 in conjunction with the rotational movement of the operating handle 6. The operating handle 6 is rotatable between an ON position where the contact unit 2 is closed and an OFF position where the contact unit 2 is opened.

[0047] In Fig. 1, the contact unit 2 is in a closed state, and the lever 61 of the operating handle 6 is tilted upward. On the other hand, in Fig. 2, the contact unit 2 is in an open state, and the lever 61 of the operating handle 6 is tilted downward.

[0048] (2-2-6) Tripping device The trip device 1 is configured to drive the above-mentioned latch section 3 to forcibly open the contact section 2 (i.e., to separate the movable contact 2B from the fixed contact 2A) when an abnormality occurs in the power supplied from the external power source to the load via the contact section 2. More specifically, the trip device 1 is configured to drive the above-mentioned latch section 3 to forcibly open the contact section 2 when an abnormal current is detected in the main circuit.

[0049] As shown in Figs. 6, 7A, and 7B, the tripping device 1 includes a fixed iron piece 11, a movable iron piece 12, a holder 13, a pushing portion 14, and a plurality of links 15 (two in Fig. 1).

[0050] The fixed iron piece 11 is made of a magnetic material, and is a plate member having a substantially U-shaped shape as shown in FIG. 6. More specifically, the fixed iron piece 11 has a first portion 111, a second portion 112, and a third portion 113. The first portion 111 is a rectangular plate member whose thickness direction intersects (here, perpendicular to) the left-right direction. The first portion 111 of this embodiment is accommodated in the housing 5 so that the upper end is located forward of the lower end as shown in FIG. 7A. In short, in this embodiment, the thickness direction of the first portion 111 does not follow the front-rear direction, but slightly intersects with the front-rear direction. The second portion 112 is a substantially rectangular plate member that protrudes forward from the right end of the first portion 111 along the thickness direction of the first portion 111 as shown in FIG. 6. Similarly, the third portion 113 is a substantially rectangular plate member that protrudes forward from the left end of the first portion 111 along the thickness direction of the first portion 111. The second portion 112 and the third portion 113 face each other in the left-right direction. Each of the second portion 112 and the third portion 113 has a first surface X1, which is a surface opposite to a surface connected to the first portion 111. The first surface X1 here is a front end surface of each of the second portion 112 and the third portion 113. Each of the second portion 112 and the third portion 113 has a locking portion 114 that locks with a rib (not shown) provided on the inner surface of the housing 5. Note that in FIG. 6, only the first surface X1 of the second portion 112 is shown, and the first surface X1 of the third portion 113 is not shown.

[0051] 6, the fixed iron piece 11 is accommodated in the housing 5 so that the fixed contact plate 81 is inserted therein. More specifically, the fixed iron piece 11 is accommodated in the housing 5 so that the fixed contact plate 81 is inserted between the second portion 112 and the third portion 113 in the left-right direction.

[0052] The movable iron piece 12 is configured to move toward the fixed iron piece 11 when an abnormality occurs in the power supplied from the external power source to the load via the contact portion 2. The movable iron piece 12 is made of a magnetic material and is a rectangular plate member. The movable iron piece 12 is accommodated in the housing 5 so as to face the first portion 111 of the fixed iron piece 11. That is, the thickness direction of the movable iron piece 12 is aligned with the thickness direction of the first portion 111 of the fixed iron piece 11. Therefore, the movable iron piece 12 has a second surface X2 facing the first surface X1 of each of the second portion 112 and the third portion 113 of the fixed iron piece 11, as shown in Figs. 7A and 7B. The second surface X2 here is the rear surface of the movable iron piece 12.

[0053] In this embodiment, the first surface X1 and the second surface X2 are each flat surfaces. More specifically, the first surface X1 and the second surface X2 are each flat surfaces facing each other.

[0054] The movable iron piece 12 is accommodated in the housing 5 so that the fixed contact plate 81 (see FIG. 6) is inserted between the movable iron piece 12 and the first portion 111 of the fixed iron piece 11 in the thickness direction. The thickness direction of the movable iron piece 12 does not follow the front-rear direction but slightly crosses it.

[0055] In this embodiment, the movable iron piece 12 is configured such that when an abnormality occurs in the power supplied from the external power source to the load via the contact portion 2, the fixed iron piece 11 and the movable iron piece 12 are magnetized, generating an attractive force (magnetic force) that attracts the movable iron piece 12 to the fixed iron piece 11, and the movable iron piece 12 moves toward the fixed iron piece 11. This configuration has the advantage that it is not necessary to provide a configuration for detecting an abnormality in the power supplied from the external power source to the load, or a configuration for the fixed iron piece 11 to attract the movable iron piece 12 by a method other than magnetic force, and the structure of the tripping device 1 can be simplified.

[0056] More specifically, when an abnormality occurs in the power supplied from the external power source to the load via the contact portion 2 and an abnormal current flows through the fixed contact plate 81, the fixed iron piece 11 and the movable iron piece 12 are magnetized since they are accommodated around the fixed contact plate 81. As a result, the movable iron piece 12 moves toward the fixed iron piece 11. The movable iron piece 12 is configured by the holder 13, the pushing portion 14, and the multiple links 15 so that the second surface X2 is kept parallel to the first surface X1 while moving toward the fixed iron piece 11. In other words, the movable iron piece 12 is configured by the holder 13, the pushing portion 14, and the multiple links 15 so that the second surface X2 is kept parallel to the first surface X1 while moving toward the fixed iron piece 11. When the abnormal current stops flowing through the fixed contact plate 81, the movable iron piece 12 is returned to its original position by the return spring portion 132 described later.

[0057] The holder 13 is a member to which the movable iron piece 12 is attached. The holder 13 moves in conjunction with the movable iron piece 12 moving toward the fixed iron piece 11. That is, the holder 13 moves together with the movable iron piece 12 moving toward the fixed iron piece 11. The holder 13 is substantially plate-shaped. The above configuration has the advantage that the movable iron piece 12 can move easily.

[0058] The holder 13 of this embodiment has a base 130, a connection portion 131, and a return spring portion 132. The base 130 of this embodiment is a plate member having a substantially rectangular shape. The movable iron piece 12 is held on the rear surface of the base 130. The connection portion 131 is provided at the center of the front surface of the base 130. The connection portion 131 is a portion to which a first link 15A (described later) out of the multiple links 15 is connected. The return spring portion 132 is formed of, for example, a coil spring, and is provided above the connection portion 131 on the front surface of the base 130. When the movable iron piece 12 moves toward the fixed iron piece 11, the return spring portion 132 bends, generating an elastic force that moves the movable iron piece 12 in a direction away from the fixed iron piece 11.

[0059] The pushing portion 14 operates in conjunction with the movable iron piece 12 moving toward the fixed iron piece 11 to push the latch portion 3 from the latched position to the non-latched position. More specifically, the pushing portion 14 pushes the end portion 33 (see FIG. 7A) of the latch portion 3 upward, thereby pushing the latch portion 3 from the latched position to the non-latched position. The pushing portion 14 in this embodiment is formed integrally with the holder 13, and moves integrally with the holder 13 when the movable iron piece 12 moves toward the fixed iron piece 11.

[0060] The pushing part 14 is made of a material lighter than the movable iron piece 12. In this embodiment, the pushing part 14 is integrally formed with the holder 13, so the holder 13 and the pushing part 14 are made of a material lighter than the movable iron piece 12. In the present disclosure, the "material lighter than the movable iron piece 12" refers to a material containing reinforced fibers such as polyamide (PA), polyamideimide (PAI), polyimide (PI), PEEK, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene (PE), ABS, polystyrene (PS), polypropylene (PP), acrylic (PMNA), polyacetal (POM), liquid crystal polymer (LCP), melamine (MF), etc. According to the above configuration, the moving speed of the movable iron piece 12 moving toward the fixed iron piece 11 becomes faster, and the latch part 3 can be pushed more strongly from the latch position to the non-latching position. That is, there is an advantage that the force with which the tripping device 1 separates the movable contact 2B from the fixed contact 2A can be strengthened. In other words, there is an advantage that the tripping force generated by the movement of the movable iron piece 12 toward the fixed iron piece 11 can be made stronger.

[0061] As shown in FIG. 1, FIG. 7A, and FIG. 7B, the push-in portion 14 of this embodiment has a base portion 140, a connection portion 141, and a contact portion 142. The base portion 140 is in the shape of a substantially rectangular plate. A first end (front lower end) of the base portion 140 is connected to an end (upper end) of the base portion 130 of the holder 13. A connection portion 141 is provided at a second end (rear upper end) of the base portion 140. The connection portion 141 is a portion to which a second link 15B, which will be described later, is connected among the multiple links 15. A contact portion 142 is provided on the opposite side of the connection portion 141 from the base portion 140. The contact portion 142 is a portion that comes into contact with the end portion 33 of the latch portion 3 when the push-in portion 14 pushes in the latch portion 3. The contact portion 142 of this embodiment is triangular when viewed from the left-right direction.

[0062] Each of the multiple links 15 movably holds the movable iron piece 12. More specifically, each of the multiple links 15 holds the movable iron piece 12 so as to be movable in parallel via the holder 13 and the pushing portion 14. Each of the multiple links 15 has a first end 151 (front end) that holds the movable iron piece 12, and a second end 152 (rear end) opposite to the first end 151.

[0063] In this embodiment, as shown in Fig. 1, Fig. 2, and Fig. 6, the multiple links 15 include a first link 15A and a second link 15B. In the first link 15A, a first end 151 holds the movable iron piece 12 by clamping the connection part 131 of the holder 13, and a second end 152 is engaged with a recess provided on the inner surface of the body 5. On the other hand, in the second link 15B, a first end 151 holds the movable iron piece 12 by clamping the pushing part 14 of the holder 13, and a second end 152 is engaged with a recess provided on the inner surface of the body 5. As a result, each of the multiple links 15 (the first link 15A and the second link 15B) makes a circular motion around the second end 152 while the movable iron piece 12 moves toward the fixed iron piece 11.

[0064] The radius of the circular motion of each of the multiple links 15 (the first link 15A and the second link 15B) is the same. That is, each of the multiple links 15 is configured to perform a circular motion of the same radius in conjunction with the movable iron piece 12 while the movable iron piece 12 is moving toward the fixed iron piece 11. In short, each of the multiple links 15 has the same dimension between the first end 151 and the second end 152. In this disclosure, "same" is not limited to being completely the same, and a slight error (for example, ±5%) is allowed. The above configuration has the advantage that it is easy to configure the second surface X2 to remain parallel to the first surface X1 while the movable iron piece 12 is moving toward the fixed iron piece 11.

[0065] Each of the multiple links 15 (first link 15A and second link 15B) has the same shape. This configuration has the advantage that the multiple links 15 can use common parts.

[0066] (2-2-7) Bimetal plate The bimetal plate 4 may be a directly heated type that curves by self-heating, or an indirectly heated type that curves by heating with a heater. One end of the bimetal plate 4 is configured to cooperate with a part of the latch member 30 when the bimetal plate 4 curves. One end of a metal plate 83 is fixed to the other end of the bimetal plate 4. The other end of the metal plate 83 is fixed to the terminal plate 71 of the first terminal portion 7A.

[0067] When an overcurrent flows due to an overload, for example, the temperature of the bimetal plate 4 rises, and one end of the bimetal plate 4 is deformed so as to bend in a direction displacing it upward. When the one end of the bimetal plate 4 is deformed, the bimetal plate 4 comes into contact with the contact portion 34 of the latch member 30 (see Figs. 1 and 2), and the pressing force of the bimetal plate 4 is transmitted to the arm 31 via the latch member 30, driving the arm 31 to pull the movable contact 2B away from the fixed contact 2A. In other words, the contact portion 2 is opened. When the overcurrent due to the overload stops, the temperature of the bimetal plate 4 drops and the bimetal plate 4 returns to its original shape.

[0068] (2-2-8) Arc extinguishing device The arc extinguishing device 84 is configured to quickly extinguish an arc that occurs when the contact portion 2 opens. The arc extinguishing device 84 has an arc running plate 841 and an arc extinguishing grid 842, as shown in FIGS.

[0069] The arc traveling plate 841 is formed by bending a band-shaped metal plate, and one end thereof is connected to one end (rear end) of the bimetal plate 4. The arc traveling plate 841 extends along the bottom wall 57 of the housing 5. The arc-extinguishing grid 842 has a plurality of arc-extinguishing plates and a support portion. The plurality of arc-extinguishing plates are formed of a conductive material, and are arranged in parallel at intervals in the front-rear direction. The support portion is formed of an electrically insulating material, and supports the plurality of arc-extinguishing plates.

[0070] The arc extinguishing device 84 extends and divides the arc that is generated when the movable contact 2B is separated from the fixed contact 2A, thereby extinguishing the arc.

[0071] (3) Advantages In this embodiment, the movable iron piece 12 is configured such that the second surface X2 remains parallel to the first surface X1 while moving toward the fixed iron piece 11, as shown in FIGS. 7A and 7B.

[0072] According to the above configuration, while the movable iron piece 12 is moving toward the fixed iron piece 11, the clearance between the fixed iron piece 11 and the movable iron piece 12 is uniform. Therefore, the magnitude of the attractive force (magnetic force) by which the fixed iron piece 11 attracts the movable iron piece 12 by magnetizing the fixed iron piece 11 and the movable iron piece 12 is approximately constant, independent of the location of the movable iron piece 12 on which the attractive force acts. Therefore, even in a state in which the movable iron piece 12 starts to move toward the fixed iron piece 11 (hereinafter also referred to as the "initial state"), the attractive force can be sufficiently exerted. As a result, in the initial state, the moving speed of the movable iron piece 12 becomes faster, and the pushing portion 14 interlocking with the movable iron piece 12 strongly pushes the latch portion 3. That is, the tripping device 1 of this embodiment has an advantage that the tripping force generated by the movement of the movable iron piece 12 toward the fixed iron piece 11 is higher than that of the tripping device A1 of the circuit breaker A10 according to the comparative example (see FIG. 3).

[0073] Moreover, according to the above configuration, the attractive force F1 (see FIG. 7A) generated in the movable iron piece 12 is along the thickness direction of the movable iron piece 12. Note that in FIG. 7A, since the magnitude of the attractive force does not depend on the position of the movable iron piece 12 on which it acts, for the sake of simplicity, one attractive force F1 is shown acting on the center of the movable iron piece 12.

[0074] Next, in the case shown in FIG. 7A, a force F2 (i.e., a pulling force F2 that pulls the contact part 2) that the push-in part 14 pushes the latch part 3 from the latch position to the non-latched position, which is generated by one attractive force F1 along the thickness direction of the movable iron piece 12, will be considered. In the following, the angle of the first link 15A with respect to the thickness direction of the movable iron piece 12 is θ1 when the movable iron piece 12 moves toward the fixed iron piece 11 as shown in FIG. 7A. The angle θ1 of the first link 15A is maximum when the movable iron piece 12 starts to move toward the fixed iron piece 11 (see FIG. 7A), gradually decreases as the movable iron piece 12 moves toward the fixed iron piece 11, and is minimum when the movable iron piece 12 contacts the fixed iron piece 11 (see FIG. 7B). In this embodiment, the angle θ1 of the first link 15A becomes 0° when the movable iron piece 12 contacts the fixed iron piece 11. The "angle θ1 of the first link 15A" here indicates the position of the movable iron piece 12 while the movable iron piece 12 is moving toward the fixed iron piece 11.

[0075] As shown in Fig. 7A, the attractive force F1 is decomposed into a first attractive force F11, which is a tangential component of the circular motion of the first link 15A, and a second attractive force F12, which is a radial component of the circular motion. Here, the pull-out force F2 is generated when the component of the first attractive force F11 along the surface direction of the movable iron piece 12 moves the movable iron piece 12 in the surface direction, and the holder 13 and the pushing part 14 linked to the movable iron piece 12 push the latch part 3 from the latch position to the non-latching position. Therefore, the pull-out force F2 is the component of the first attractive force F11 along the surface direction of the movable iron piece 12, and is calculated by the following (Equation 1).

[0076]

number

[0077] In the tripping device A1 according to the comparative example as shown in FIG. 3, the tripping force F2 increases exponentially as the position of the movable iron 12 moving toward the fixed iron 11 approaches the fixed iron 11. On the other hand, in the tripping device 1 according to the present embodiment, the tripping force F2 is affected by "cosθ1×sinθ1" as shown in (Equation 1), and therefore, compared to the tripping device A1 according to the comparative example, the tripping force F2 varies less with respect to the position (angle θ1) of the movable iron 12 moving toward the fixed iron 11. In other words, in the tripping device 1 according to the present embodiment, the tripping force F2 varies less with respect to the amount of movement of the movable iron 12 toward the fixed iron 11 (has a flat characteristic). Here, the amount by which the pushing portion 14 pushes the latch portion 3 (hereinafter, also referred to as the "latch amount") is proportional to the amount of movement of the movable iron 12 toward the fixed iron 11. For this reason, in the tripping device 1 according to the present embodiment, the tripping force F2 varies less with respect to the latch amount. Therefore, the tripping device 1 of this embodiment has the advantage that it is less susceptible to the effect of the latch amount and can stably open the contact unit 2. In other words, the tripping device 1 of this embodiment has the advantage that it has high robustness against the latch amount. Here, "robustness" refers to the degree of strength against external influences.

[0078] More specifically, the advantages of the tripping device 1 of this embodiment will be described with reference to FIG. 8. Graph G1 in FIG. 8 shows the change in tripping force F2 depending on the latch amount in the tripping device 1 of this embodiment. Meanwhile, graph G2 in FIG. 8 shows the change in tripping force F2 depending on the latch amount in a comparative tripping device A1 (see FIG. 3) of the same size as the tripping device 1 of this embodiment. The "same size" here means, more specifically, that the plate thicknesses of the fixed iron piece 11 and the movable iron piece 12 in the tripping device 1 of this embodiment are approximately the same as the plate thicknesses of the fixed iron piece A11 and the movable iron piece A12 in the tripping device A1. Graph G3 in FIG. 8 shows the change in tripping force F2 depending on the latch amount in a tripping device in which the plate thicknesses of the fixed iron piece A11 and the movable iron piece A12 are increased compared to the tripping device A1 shown in FIG. 3 (hereinafter, also simply referred to as "tripping device with increased plate thickness"). It should be noted that graphs G1, G2, and G3 are calculated by magnetic field analysis.

[0079] In the tripping device A1 according to the comparative example, the change (slope) of the tripping force F2 with respect to the latch amount is large, and the tripping force F2 when the pushing part A14 starts to move is small, compared to the tripping device 1 of the present embodiment, according to the graphs G1 and G2. Therefore, in the tripping device A1 according to the comparative example, when the initial gap between the pushing part A14 and the latch part A3 is narrow and it is difficult to increase the latch amount, it is considered that the load applied by the pushing part A14 to the latch part A3 by the tripping force F2 becomes small. In other words, in the tripping device A1 according to the comparative example, it is considered that the contact part cannot be released even if an abnormal current flows through the fixed contact plate A81.

[0080] However, in the tripping device 1 of this embodiment, the change (slope) of the tripping force F2 with respect to the latch amount is small, and the tripping force F2 when the pushing part 14 starts to move is large, as shown in graphs G1 and G2, compared to the tripping device A1 of the comparative example. Therefore, even if the initial gap between the pushing part 14 (contact part 142) and the latch part 3 (end 33) is narrow and it is difficult to increase the latch amount, the load applied by the pushing part 14 to the latch part 3 by the tripping force F2 becomes large. That is, the tripping device 1 of this embodiment has the advantage that, when an abnormal current flows through the fixed contact plate 81, even if the initial gap between the pushing part 14 (contact part 142) and the latch part 3 (end 33) is narrow, the contact part can be released.

[0081] Moreover, according to graphs G1 and G3, in the tripping device 1 of this embodiment, the tripping force F2 when the pushing part 14 starts to move is substantially the same (more precisely, slightly larger) as that of the tripping device with an increased plate thickness. In other words, the tripping device 1 of this embodiment has the advantage that it can be made smaller than a tripping device with substantially the same tripping force F2 when the pushing part 14 starts to move.

[0082] (4) Variations The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. The following modified examples may be realized in appropriate combination. The same reference numerals are used to designate the same components as those in the above-described embodiment, and the description thereof will be omitted.

[0083] (4-1) First Modification In the above-mentioned embodiment, the first surface X1 and the second surface X2 are flat surfaces facing each other. However, as shown in FIG. 9, in the tripping device 1a of the first modified example, the first surface X1a and the second surface X2a may be surfaces having the same uneven shape. More specifically, the first surface X1a has each uneven surface X11a, which is a flat surface. Similarly, the second surface X2a has each uneven surface X21a, which is a flat surface. The surfaces X11a and X21a have the same dimensions when viewed from the left-right direction. The "surface having an uneven shape" here is a surface having a shape in which a plurality of pointed portions are arranged along the surface direction of the first surface X1a and the second surface X2a, that is, a so-called jagged shape, when viewed from the left-right direction.

[0084] The movable iron piece 12a is configured so that each surface X21a of the uneven shape of the second surface X2a remains parallel to the opposing surface X11a of the uneven shape of the first surface X1a while moving toward the fixed iron piece 11a. In other words, the movable iron piece 12a is configured so that each surface X21a of the uneven shape of the second surface X2a remains parallel to the opposing surface X11a of the uneven shape of the first surface X1a while moving toward the fixed iron piece 11a.

[0085] According to the above configuration, the surface area of ​​each of the first surface X1a and the second surface X2a can be increased. As a result, the tripping device 1a of the first modified example has an effect that the magnitude of the attractive force with which the fixed iron piece 11 attracts the movable iron piece 12 is increased. In other words, the tripping device 1a of the first modified example has an advantage that the tripping force generated by the movable iron piece 12 moving toward the fixed iron piece 11 is increased.

[0086] (4-2) Other variations Other variations of the above-described embodiment are listed below. The following variations may be implemented in appropriate combination.

[0087] The pushing portion 14 is formed of a material lighter than the movable iron piece 12, but may be formed of a magnetic material. For example, the pushing portion 14 may be formed of the same material as the movable iron piece 12, which is formed of a magnetic material. When the pushing portion 14 is integrally formed with the holder 13, the holder 13 and the pushing portion 14 may be formed of a magnetic material. The pushing portion 14 may be formed of a magnetic material lighter than the movable iron piece 12. The above configuration has the advantage that the magnetic resistance of the movable iron piece 12 is reduced, and the force with which the fixed iron piece 11 attracts the movable iron piece 12 is increased.

[0088] In the above embodiment, both of the two terminals 7 are screw-type terminals, but this is not particularly limited. At least one of the two terminals 7 may be a terminal with a so-called quick-connect structure that can be connected without using screws.

[0089] (summary) The tripping device (1, 1a) of the first aspect is a tripping device that opens the contact part (2) by moving the latch part (3) from the latched position to the non-latched position when an abnormality occurs in the power supplied from an external power source to a load via the contact part (2). The tripping device (1, 1a) includes a fixed iron piece (11, 11a), a movable iron piece (12, 12a), and a pushing part (14). The movable iron piece (12, 12a) is configured to move toward the fixed iron piece (11, 11a) when an abnormality occurs. The pushing part (14) is linked to the movable iron piece (12, 12a) moving toward the fixed iron piece (11, 11a) and pushes the latch part (3) from the latched position to the non-latched position. The movable iron piece (12, 12a) has a second surface (X2, X2a) facing the first surface (X1, X1a) of the fixed iron piece (11, 11a). The movable iron piece (12, 12a) is configured such that the second surface (X2, X2a) remains parallel to the first surface (X1, X1a) while moving toward the fixed iron piece (11, 11a).

[0090] This embodiment has the advantage that a strong pulling force is generated when the movable iron piece (12, 12a) moves toward the fixed iron piece (11, 11a).

[0091] In the tripping device (1, 1a) of the second embodiment, in the first embodiment, the pushing section (14) has a plurality of links (15) that movably hold the movable iron piece (12, 12a). Each of the plurality of links (15) performs a circular motion about a second end (152) opposite to a first end (151) that holds the movable iron piece (12, 12a) while the movable iron piece (12, 12a) moves toward the fixed iron piece (11, 11a). The radius of the circular motion performed by each of the plurality of links (15) is the same.

[0092] This embodiment has the advantage that it is easier to configure the second surface (X2, X2a) to remain parallel to the first surface (X1, X1a) while the movable iron piece (12, 12a) is moving toward the fixed iron piece (11, 11a).

[0093] In the tripping device (1, 1a) of the third embodiment, each of the multiple links (15) in the second embodiment has the same shape.

[0094] According to this embodiment, there is an advantage that parts can be standardized among a plurality of links (15).

[0095] In the tripping device (1, 1a) of the fourth aspect, in any one of the first to third aspects, the push-in portion (14) is made of a material lighter than the movable iron piece (12, 12a).

[0096] According to this embodiment, there is an advantage that the pulling force generated by the movement of the movable iron piece (12, 12a) toward the fixed iron piece (11, 11a) can be increased.

[0097] In the tripping device (1, 1a) of the fifth aspect, in any one of the first to fourth aspects, the fixed iron piece (11, 11a) and the movable iron piece (12, 12a) are made of a magnetic material. The movable iron piece (12, 12a) is configured to move toward the fixed iron piece (11, 11a) as a result of the fixed iron piece (11, 11a) and the movable iron piece (12, 12a) being magnetized in the event of an abnormality.

[0098] According to this embodiment, there is an advantage that the structure of the tripping device (1, 1a) can be simplified.

[0099] The tripping device (1, 1a) of the sixth aspect is the fifth aspect, in which the push-in portion (14) is made of a magnetic material.

[0100] According to this embodiment, there is an advantage that the magnetic resistance of the movable iron pieces (12, 12a) is reduced, and the force with which the fixed iron pieces (11, 11a) attract the movable iron pieces (12, 12a) is increased.

[0101] The tripping device (1a) of the seventh aspect is any one of the first to sixth aspects, in which the first surface (X1a) and the second surface (X2a) have the same concave-convex shape. The movable iron piece (12a) is configured such that, while moving toward the fixed iron piece (11a), each surface (X21a) of the concave-convex shape of the second surface (X2a) remains parallel to the opposing surface (X11a) of the concave-convex shape of the first surface (X1a).

[0102] This embodiment has the advantage that the pulling force generated by the moving iron piece (12, 12a) moving toward the fixed iron piece (11, 11a) is increased.

[0103] The tripping device (1, 1a) of the eighth aspect is any one of the first to seventh aspects, in which the pushing part (14) has a holder (13) to which the movable iron piece (12, 12a) is attached. The holder (13) is plate-shaped.

[0104] This embodiment has the advantage that the movable iron pieces (12, 12a) can move easily.

[0105] A circuit breaker (10) of a ninth aspect includes a tripping device according to any one of the first to eighth aspects, a first terminal unit (7A), a second terminal unit (7B), a contact unit (2), and a latch unit (3). The first terminal unit (7A) is electrically connected to an external power supply. The second terminal unit (7B) is electrically connected to a load. The contact unit (2) is inserted in an electric path between the first terminal unit (7A) and the second terminal unit (7B). The latch unit (3) is pushed from a latched position to a non-latched position by a push-in unit (14), thereby opening the contact unit (2).

[0106] According to this embodiment, there is an advantage that it is possible to provide a circuit breaker that generates a strong tripping force by moving the movable iron piece (12, 12a) toward the fixed iron piece (11, 11a).

[0107] A distribution board (100) according to a tenth aspect includes the circuit breaker (10) according to the ninth aspect and a cabinet (93) that houses the circuit breaker (10).

[0108] According to this embodiment, there is an advantage that a distribution board can be provided in which a high pull-out force is generated by the movement of the movable iron piece (12, 12a) toward the fixed iron piece (11, 11a). [Explanation of symbols]

[0109] 100 Distribution Board 10. Circuit Breakers 1, 1a Tripping device 2 Contact area 3 Latch section 7A 1st terminal section 7B 2nd terminal section 11, 11a Fixed iron piece 12, 12a Movable iron piece 13 Holder 14 Push-in section 15 Links 151 1st end 152 2nd end 93 Cabinet X1, X1a 1st side X2, X2a 2nd side X11a side X21a side

Claims

1. A tripping device that opens a contact portion by moving a latch portion from a latched position to an unlatched position when an abnormality occurs in power supplied from an external power source to a load via the contact portion, A fixed iron piece; a movable iron piece configured to move toward the fixed iron piece when the abnormality occurs; a pushing portion which is linked with the movable iron piece moving toward the fixed iron piece and pushes the latch portion from the latch position to the non-latching position, The movable iron piece is A second surface facing the first surface of the fixed iron piece is provided. The second surface is configured to remain parallel to the first surface while moving toward the fixed iron piece. Release device.

2. The pushing portion has a plurality of links that movably hold the movable iron piece, Each of the plurality of links performs a circular motion about a second end opposite to a first end that holds the movable iron piece while the movable iron piece moves toward the fixed iron piece, The radius of the circular motion performed by each of the plurality of links is the same. The tripping device according to claim 1.

3. Each of the plurality of links has the same shape. The tripping device according to claim 2.

4. The pushing portion is formed of a material lighter than the movable iron piece. The tripping device according to claim 1.

5. The fixed iron piece and the movable iron piece are made of a magnetic material, The movable iron piece is configured to move toward the fixed iron piece by magnetizing the fixed iron piece and the movable iron piece when the abnormality occurs. The tripping device according to claim 1.

6. The push-in portion is formed of a magnetic material. The tripping device according to claim 5.

7. The first surface and the second surface each have the same uneven shape, The movable iron piece is configured such that, while moving toward the fixed iron piece, each surface of the concave-convex shape of the second surface is kept parallel to the opposing surface of the concave-convex shape of the first surface. The tripping device according to claim 1.

8. The pushing portion has a holder to which the movable iron piece is attached, The holder is plate-shaped. The tripping device according to claim 1.

9. A tripping device according to claim 1; A first terminal portion electrically connected to the external power supply; A second terminal portion electrically connected to the load; The contact portion is inserted into an electric path between the first terminal portion and the second terminal portion; The latch portion is pushed from the latch position to the non-latching position by the push-in portion to open the contact portion. Circuit breaker.

10. A circuit breaker according to claim 9; a cabinet housing the circuit breaker; Distribution board.

Images