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 first detachment unit 1A having a first fixed iron piece 11A, a first movable iron piece 12A, and a first push-in unit 14A, and a second detachment unit 1B having a second fixed iron piece 11B, a second movable iron piece 12B, and a second push-in unit 14B. When abnormality occurs, the first push-in unit 14A interlocks with the first movable iron piece 12A moving toward the first fixed iron piece 11A and pushes in a first latch portion 3A toward a first non-latch position. When abnormality occurs, the second push-in portion 14B interlocks with the second movable iron piece 12B moving toward the second fixed iron piece 11B and pushes in the second latch portion 3B toward a second non-latch position.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, moves a first latch portion from a first latch position toward a first non-latching position and moves a second latch portion from a second latch position toward a second non-latching position, thereby opening the contact portion. The tripping device includes a first tripping portion and a second tripping portion. The first tripping portion moves the first latch portion toward the first non-latching position. The second tripping portion is separate from the first tripping portion and moves the second latch portion toward the second non-latching position. The first tripping portion includes a first fixed iron piece, a first movable iron piece, and a first pushing portion. The first movable iron piece is configured to move toward the first fixed iron piece when the abnormality occurs. The first pushing portion is interlocked with the first movable iron piece moving toward the first fixed iron piece, and pushes the first latch portion toward the first unlatched position. The second tripping portion has a second fixed iron piece, a second movable iron piece, and a second pushing portion. The second movable iron piece is configured to move toward the second fixed iron piece when the abnormality occurs. The second pushing portion is interlocked with the second movable iron piece moving toward the second fixed iron piece, and pushes the second latch portion toward the second unlatched position.

[0007] A circuit breaker according to one embodiment of the present disclosure includes the tripping device, a first terminal portion, a second terminal portion, the contact portion, the first latch portion, and the second latch portion. The first terminal portion is electrically connected to the external power supply. The second terminal portion is 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 first latch portion is pushed toward the first unlatched position by the first pushing portion. The second latch portion is pushed toward the second unlatched position by the second pushing portion.

[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 an external view of a distribution board including the circuit breaker of the above embodiment. [Figure 4] FIG. 4 is a perspective view of the circuit breaker. [Diagram 5] FIG. 5 is an external perspective view of a first tripping unit of a tripping device in the circuit breaker. [Figure 6] Fig. 6A is a plan view of a main part including a first tripping unit of a tripping device in the circuit breaker shown in Fig. 1. Fig. 6B is a plan view of a main part including a first tripping unit of a tripping device in the circuit breaker shown in Fig. 2. [Figure 7]FIG. 7 is an external perspective view of a main part of a second tripping unit of a tripping device in the circuit breaker. [Figure 8] Fig. 8A is a plan view of the main part including the second tripping unit of the tripping device in the circuit breaker in Fig. 1. Fig. 8B is a plan view of the main part including the second tripping unit of the tripping device in the circuit breaker in Fig. 2. [Figure 9] FIG. 9 is an explanatory diagram illustrating a change in tripping force due to a current flowing through a main circuit in the circuit breaker of the above. 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 Hereinafter, an overview of a tripping device 1 according to this embodiment will be described with reference to FIGS.

[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 portion 2, the first latch portion 3A is moved from the first latch position toward the first non-latch position, and the second latch portion 3B is moved from the second latch position toward the second non-latch position, thereby opening the contact portion 2.

[0014] The "first latch position" in this disclosure is a position where the first latch portion 3A closes the contact portion 2. On the other hand, the "first non-latching position" in this disclosure is a position where the first latch portion 3A opens the contact portion 2. Similarly, the "second latch position" in this disclosure is a position where the second latch portion 3B closes the contact portion 2. On the other hand, the "second non-latching position" in this disclosure is a position where the second latch portion 3B opens the contact portion 2.

[0015] As shown in Figs. 1 and 2, the tripping device 1 includes a first tripping unit 1A and a second tripping unit 1B.

[0016] The first tripping part 1A moves the first latch part 3A toward the first non-latched position. The first tripping part 1A has a first fixed iron piece 11A, a first movable iron piece 12A, and a first pushing part 14A. The first movable iron piece 12A is configured to move toward the first fixed iron piece 11A when an abnormality occurs in the power supplied from the external power source to the load via the contact part 2. The first pushing part 14A is linked to the first movable iron piece 12A moving toward the first fixed iron piece 11A, and pushes the first latch part 3A toward the first non-latched position.

[0017] The second tripping part 1B is separate from the first tripping part 1A and moves the second latch part 3B toward the second non-latching position. The term "separate" here means that the first tripping part 1A and the second tripping part 1B are not integrally formed, that is, the first tripping part 1A and the second tripping part 1B are provided at different positions inside the circuit breaker 10. The second tripping part 1B has a second fixed iron piece 11B, a second movable iron piece 12B, and a second pushing part 14B. The second movable iron piece 12B is configured to move toward the second fixed iron piece 11B when an abnormality occurs in the power supplied from the external power source to the load via the contact part 2. The second pushing part 14B is linked to the second movable iron piece 12B moving toward the second fixed iron piece 11B and pushes the second latch part 3B toward the second non-latching position.

[0018] The tripping device of the circuit breaker according to the comparative example has only one tripping unit. Therefore, the tripping device according to the comparative example has a problem that the force for opening (tripping) the contact unit is low. In other words, the tripping device according to the comparative example may not be able to open the contact unit even if an abnormality occurs in the power supplied from the external power source to the load via the contact unit.

[0019] On the other hand, in the circuit breaker 10 of this embodiment, the first tripping unit 1A and the second tripping unit 1B each move the first latching unit 3A or the second latching unit 3B to open the contact unit 2. Therefore, the tripping device 1 of this embodiment has an advantage over the tripping device of the comparative example in that the tripping force generated by the moving iron piece (the first moving iron piece 12A and the second moving iron piece 12B) moving toward the fixed iron piece (the first fixed iron piece 11A and the second fixed iron piece 11B) is high. Note that the "tripping force" in this disclosure refers to the force with which the first latching unit 3A and the second latching unit 3B release the contact unit 2, that is, the force with which the contact unit 2 is opened.

[0020] (2) Detailed configuration Hereinafter, detailed configurations of the tripping device 1, the circuit breaker 10, and the distribution board 100 according to this embodiment will be described with reference to Figs.

[0021] (2-1) Distribution board 3, 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).

[0022] The cabinet 93 is made of, for example, synthetic resin. As shown in Fig. 3, 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.

[0023] 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.

[0024] 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.

[0025] 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."

[0026] (2-2) Circuit breaker (2-2-1) Overall Structure As shown in Figures 1 and 2, the circuit breaker 10 comprises a tripping device 1, a contact portion 2, a first latch portion 3A, a second latch portion 3B, 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.

[0027] 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 the passage of electricity from an external power source to a load (passage of electricity 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 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.

[0028] The main circuit in 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 7A and a second terminal 7B, which will be described later, of the pair of terminals 7. The main circuit is composed of a fixed contact plate 81, a common latch unit 3, a braided wire 82, a bimetal plate 4, a metal plate 83, and the like.

[0029] (2-2-2) Body As shown in FIG. 4, 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.

[0030] 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.

[0031] The housing 5 accommodates therein the tripping device 1, the contact portion 2, the first latch portion 3A, the second latch portion 3B, 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 4, the housing 5 supports a part of the operating handle 6 (the lever 61) so as to be exposed to the outside from the 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.

[0032] 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.

[0033] (2-2-3) Terminal section As shown in Figs. 1 and 2, the first terminal 7A of the pair of terminals 7 is accommodated in the upper end of the housing 5, and the other 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.

[0034] 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.

[0035] Terminal plate 71 is made of a conductive metal plate and is formed into a generally L-shaped plate shape. Terminal plate 71 is fixed inside housing 5.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] (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.

[0041] 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.

[0042] 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.

[0043] The movable contact 2B is located at one end of an arm 31 (movable contactor) of the common latch unit 3, which will be described later, 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.

[0044] 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.

[0045] 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.

[0046] 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 common latch portion 3, and the fixed contact plate 81, and is input to the load from the second terminal portion 7B.

[0047] 1 and 2, the main circuit of this embodiment (the electrical path between the first terminal 7A and the second terminal 7B) has a first electrical path L1 between the first terminal 7A and the contact portion 2, and a second electrical path L2 between the contact portion 2 and the second terminal 7B. The first electrical path L1 is a metal plate 83, a bimetal plate 4, a braided wire 82, and a common latch portion 3, and the second electrical path L2 is a fixed contact plate 81.

[0048] (2-2-5) Common latch section The first latch portion 3A is a member pushed toward the first non-latching position by the first pushing portion 14A, and the second latch portion 3B is a member pushed toward the second non-latching position by the second pushing portion 14B. In this embodiment, the first latch portion 3A and the second latch portion 3B are a single common latch portion 3 that functions as the first latch portion 3A and the second latch portion 3B. Therefore, the first pushing portion 14A and the second pushing portion 14B of the tripping device 1 described later push the common latch portion 3 toward the common non-latching position, which is the first non-latching position and the second non-latching position. According to the above configuration, the circuit breaker 10 does not need to have the first latch portion 3A and the second latch portion 3B as separate components, and has the advantage that the configuration of the circuit breaker 10 can be simplified. Furthermore, when the first latch portion 3A and the second latch portion 3B are a single common latch portion 3, the force with which each of the first push-in portion 14A and the second push-in portion 14B pushes in the common latch portion 3 is not attenuated between the first latch portion 3A and the second latch portion 3B, and acts as a tripping force that opens the contact portion 2. In other words, there is also an advantage that the tripping force of the tripping device 1 can be prevented from decreasing.

[0049] That is, in this embodiment, the "first latch position" and the "second latch position" are a common position, a "common latch position," which is a position where the common latch section 3 closes the contact section 2, as shown in Fig. 1. On the other hand, the "first non-latch position" and the "second non-latch position" are a common position, a "common non-latch position," which is a position where the common latch section 3 opens the contact section 2, as shown in Fig. 1.

[0050] The common latch section 3 is configured to open or close the contact section 2 in response to an open operation (OFF operation) or a close operation (ON operation). More specifically, the common latch section 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 open operation or a close operation. When the common latch section 3 is in the latched position (see FIG. 1), the common latch section 3 closes the contact section 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 common latch section 3 is in the non-latched position (see FIG. 2), the common latch section 3 opens the contact section 2, that is, holds the state in which the movable contact 2B is separated from the fixed contact 2A.

[0051] The common latch section 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 section 2 is closed and an OFF position where the contact section 2 is opened.

[0052] 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.

[0053] (2-2-6) Tripping device The trip device 1 is configured to drive the above-mentioned common 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 common latch section 3 to forcibly open the contact section 2 when an abnormal current is detected in the main circuit.

[0054] As shown in Figs. 1 and 2, the tripping device 1 includes a first tripping unit 1A and a second tripping unit 1B. The first tripping unit 1A moves the common latch unit 3 toward the common unlatched position when an abnormality occurs in the power supplied from the external power source to the load. More specifically, the first tripping unit 1A is configured to move the first movable iron piece 12A toward the first fixed iron piece 11A when the current value of the power supplied from the external power source to the load becomes higher than a first threshold value. On the other hand, the second tripping unit 1B moves the common latch unit 3 toward the common unlatched position when an abnormality occurs in the power supplied from the external power source to the load. More specifically, the second tripping unit 1B is configured to move the second movable iron piece 12B toward the second fixed iron piece 11B when the current value of the power supplied from the external power source to the load becomes higher than a second threshold value. In this embodiment, the second threshold value of the second tripping unit 1B is higher than the first threshold value of the first tripping unit 1A. This configuration has the advantage that the tripping force of the tripping device 1 can be increased stepwise, and the operation of the tripping device 1 can be stabilized. In other words, it has the advantage that the malfunction of the tripping device 1 can be suppressed.

[0055] First, the detailed configuration of the first tripping unit 1A will be described with reference to Figures 5, 6A, and 6B. The first tripping unit 1A includes a first fixed iron piece 11A, a first movable iron piece 12A, a first holder 13A, and a first pushing portion 14A. The first tripping unit 1A of this embodiment is disposed on the second electric circuit L2, more specifically, on the fixed contact plate 81.

[0056] The first fixed iron piece 11A is made of a magnetic material, and is a substantially U-shaped plate member as shown in FIG. 5. More specifically, the first fixed iron piece 11A has a first portion 111A, a second portion 112A, and a third portion 113A. The first portion 111A is a rectangular plate member whose thickness direction intersects (here, perpendicular to) the left-right direction. The first portion 111A 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. 6A. In short, in this embodiment, the thickness direction of the first portion 111A does not follow the front-rear direction, but slightly intersects with the front-rear direction. The second portion 112A is a substantially rectangular plate member that protrudes forward from the right end of the first portion 111A along the thickness direction of the first portion 111A as shown in FIG. 5. Similarly, the third portion 113A is a substantially rectangular plate member protruding forward from the left end of the first portion 111A along the thickness direction of the first portion 111A. The second portion 112A and the third portion 113A face each other in the left-right direction. Each of the second portion 112A and the third portion 113A has a locking portion 114 that locks with a rib (not shown) provided on the inner surface of the housing 5.

[0057] 5, the first fixed iron piece 11A is accommodated in the housing 5 so that the fixed contact plate 81 is inserted therein. More specifically, the first fixed iron piece 11A is accommodated in the housing 5 so that the fixed contact plate 81 is inserted between the second portion 112A and the third portion 113A in the left-right direction.

[0058] The first movable iron piece 12A is configured to move toward the first fixed iron piece 11A when an abnormality occurs in the power supplied from the external power source to the load via the contact portion 2. The first movable iron piece 12A is made of a magnetic material and is a rectangular, long plate member. The thickness direction of the first movable iron piece 12A does not follow the front-rear direction but slightly crosses it. When viewed from the left-right direction, the thickness direction of the first movable iron piece 12A crosses the thickness direction of the first portion 111A of the first fixed iron piece 11A. More specifically, as shown in FIG. 6A, in a state before the first movable iron piece 12A moves toward the first fixed iron piece 11A (i.e., when the contact portion 2 is closed), the thickness direction of the first movable iron piece 12A crosses the front-rear direction more than the thickness direction of the first portion 111A of the first fixed iron piece 11A when viewed from the left-right direction.

[0059] As shown in Fig. 6A, the first movable iron piece 12A is accommodated in the housing 5 so that the clearance between the rear surface of the first movable iron piece 12A and the front surface of the second part 112A of the first fixed iron piece 11A gradually increases from the first end (lower end) to the second end (upper end) of the rear surface of the first movable iron piece 12A when viewed from the left and right direction in a state in which the contact part 2 is closed. Also, the first movable iron piece 12A is accommodated in the housing 5 so that the fixed contact plate 81 (see Fig. 5) is inserted between the first movable iron piece 12A and the first part 111A of the first fixed iron piece 11A in the thickness direction.

[0060] In this embodiment, the first movable iron piece 12A is configured such that when the current value of the power supplied from the external power source to the load becomes higher than the first threshold value, the first fixed iron piece 11A and the first movable iron piece 12A are magnetized, so that the first fixed iron piece 11A generates an attractive force (magnetic force) that attracts the first movable iron piece 12A, and moves toward the first fixed iron piece 11A. More specifically, when the current value of the power flowing through the fixed contact plate 8 becomes higher than the first threshold value, the first fixed iron piece 11A and the first movable iron piece 12A are accommodated around the fixed contact plate 81 and are therefore magnetized. As a result, the first movable iron piece 12A moves toward the first fixed iron piece 11A. According to the above configuration, there is no need 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 first fixed iron piece 11A to attract the first movable iron piece 12A by a method other than magnetic force, and there is an advantage that the structure of the tripping device 1 can be simplified.

[0061] The first holder 13A is a member to which the first movable iron piece 12A is attached. The first holder 13A moves in conjunction with the first movable iron piece 12A moving toward the first fixed iron piece 11A. That is, the first holder 13A moves together with the first movable iron piece 12A moving toward the first fixed iron piece 11A.

[0062] The first holder 13A of this embodiment has a base 130A, an attachment portion 131A, a connection portion 132, and a return spring portion 133. The base 130A of this embodiment is a plate member having a substantially rectangular shape. The first movable iron piece 12A is held on the rear surface of the base 130A. The attachment portion 131A attaches the base 130A to the inside of the housing 5 so as to be rotatable about a center point P1. The attachment portion 131A is provided at the lower end of the base 130A. The attachment portion 131A of this embodiment is rod-shaped and is attached to a boss portion 58 (FIGS. 6A and 6B) provided on the inside of the housing 5. The connection portion 132 is a portion to which the first pushing portion 14A is connected. The connection portion 132 is provided at the upper end of the base 130A. The return spring portion 133 is formed of, for example, a coil spring, and is provided on the upper side of the front surface of the base portion 130A. When the first movable iron piece 12A moves toward the first fixed iron piece 11A, the return spring portion 133 bends, and generates an elastic force that moves the first movable iron piece 12A in a direction away from the first fixed iron piece 11A.

[0063] The first movable iron piece 12A is attached to the first holder 13A and is configured to rotate around a center point P1 toward the first fixed iron piece 11A due to an attractive force generated when the current value of the power supplied from the external power source to the load becomes higher than a first threshold value.

[0064] The first pushing portion 14A pushes the first latch portion 3A toward the first non-latch position when an abnormality occurs in the power supplied to the second electric circuit L2. In this embodiment, since the common latch portion 3 also serves as the second latch portion 3B, the first pushing portion 14A pushes the common latch portion 3 toward the common non-latch position when an abnormality occurs in the power supplied to the second electric circuit L2. The first pushing portion 14A pushes the common latch portion 3 from the common latch position to the common non-latch position in conjunction with the first movable iron piece 12A moving toward the first fixed iron piece 11A. More specifically, the first pushing portion 14A pushes the first portion 33A (see FIG. 6A and FIG. 6B) of the common latch portion 3 upward, thereby pushing the common latch portion 3 from the common latch position to the common non-latch position.

[0065] As shown in FIG. 5, FIG. 6A, and FIG. 6B, the first pushing portion 14A of this embodiment has a connecting portion 141, a first portion 142, an attachment portion 143, a second portion 144, and a contact portion 145. The first portion 142 and the second portion 144 are substantially rectangular plate-shaped. The thickness direction of the first portion 142 is substantially along the front-rear direction, and the thickness direction of the second portion 144 is substantially along the front-rear direction. A connecting portion 141 that is a portion that connects to the connecting portion 132 of the first holder 13A is provided at a first end (lower end) of the first portion 142. As shown in FIG. 5, the connecting portion 132 of the first holder 13A and the connecting portion 141 of the first pushing portion 14A are connected by a rotation joint. The second end (upper end) of the first portion 142 is connected to the first end (front end) of the second portion 144. An attachment portion 143 is provided at a connection portion between the second end (upper end) of the first portion 142 and the first end (front end) of the second portion 144. The attachment portion 143 attaches the first pushing portion 14A to the inside of the housing 5 so as to be rotatable about a center point P2. The attachment portion 143 of this embodiment is rod-shaped and is attached to a boss portion 59 (FIGS. 6A and 6B) provided on the inside of the housing 5. A contact portion 145 is provided at a second end (rear end) of the second portion 144. The contact portion 145 is a portion that comes into contact with the first portion 33A of the common latch portion 3 when the first pushing portion 14A pushes in the common latch portion 3. The contact portion 145 of this embodiment is semicircular when viewed from the left-right direction.

[0066] Next, the detailed configuration of the second tripping unit 1B will be described with reference to Fig. 7, Fig. 8A, and Fig. 8B. The second tripping unit 1B includes a second fixed iron piece 11B, a second movable iron piece 12B, a second holder 13B, and a second pushing unit 14B. The second tripping unit 1B of this embodiment is disposed on the first electric circuit L1, more specifically, on the bimetal plate 4. In this embodiment, the first tripping unit 1A is disposed on the second electric circuit L2, and the second tripping unit 1B is disposed on the first electric circuit L1, which has the advantage that an abnormality in the power supplied from the external power source to the load can be detected more accurately and the contact unit 2 can be opened.

[0067] The second fixed iron piece 11B is made of a magnetic material, and is a plate member having a substantially U-shape as shown in FIG. 7. More specifically, the second fixed iron piece 11B has a first portion 111B, a second portion 112B, and a third portion 113B. The first portion 111B is a rectangular plate member whose thickness direction is along the up-down direction. The second portion 112B is a substantially rectangular plate member protruding downward from the right end of the first portion 111B along the thickness direction of the first portion 111B as shown in FIG. 7. Similarly, the third portion 113B is a substantially rectangular plate member protruding downward from the left end of the first portion 111B along the thickness direction of the first portion 111B. The second portion 112B and the third portion 113B face each other in the left-right direction.

[0068] 7, the second fixed iron piece 11B is accommodated in the housing 5 so that the bimetal plate 4 is inserted therein. More specifically, the second fixed iron piece 11B is accommodated in the housing 5 so that the bimetal plate 4 is inserted between the second portion 112B and the third portion 113B in the left-right direction.

[0069] The second movable iron piece 12B is configured to move toward the second fixed iron piece 11B when an abnormality occurs in the power supplied from the external power source to the load via the contact portion 2. The second movable iron piece 12B is made of a magnetic material and is a long rectangular plate member. As shown in Figs. 8A and 8B, the thickness direction of the second movable iron piece 12B does not follow the up-down direction but slightly crosses it.

[0070] As shown in Fig. 8A, the second movable iron piece 12B is accommodated in the housing 5 so that the clearance between the upper surface of the second movable iron piece 12B and the lower surface of the second portion 112B of the second fixed iron piece 11B gradually increases from the first end (rear end) to the second end (front end) of the upper surface of the second movable iron piece 12B when viewed from the left-right direction. Also, the second movable iron piece 12B is accommodated in the housing 5 so that the bimetal plate 4 (see Fig. 7) is inserted between the second movable iron piece 12B and the first portion 111B of the second fixed iron piece 11B in the thickness direction.

[0071] In this embodiment, the second movable iron piece 12B is configured such that when the current value of the power supplied from the external power source to the load becomes higher than the second threshold value, the second fixed iron piece 11B and the second movable iron piece 12B are magnetized, so that the second fixed iron piece 11B generates an attractive force (magnetic force) that attracts the second movable iron piece 12B, and moves toward the second fixed iron piece 11B. More specifically, when the current value of the power flowing through the bimetal plate 4 becomes higher than the second threshold value, the second fixed iron piece 11B and the second movable iron piece 12B are magnetized because they are accommodated around the bimetal plate 4. As a result, the second movable iron piece 12B moves toward the second fixed iron piece 11B. According to the above configuration, there is no need 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 second fixed iron piece 11B to attract the second movable iron piece 12B by a method other than magnetic force, and there is an advantage that the structure of the tripping device 1 can be simplified.

[0072] The second holder 13B of this embodiment has a base 130B, an attachment portion 131B, and a return spring portion (not shown). The base 130B of this embodiment is a plate member having a substantially rectangular shape. The second movable iron piece 12B is held on the upper surface of the base 130B. The attachment portion 131B attaches the base 130B to the inside of the housing 5 so as to be rotatable about a center point P3. The attachment portion 131B is provided at the rear end of the base 130B. The attachment portion 131B of this embodiment is rod-shaped, and is attached to a boss portion (not shown) provided on the inside of the housing 5. The return spring portion is composed of, for example, a coil spring, and is provided on the upper side of the front surface of the base 130B. The return spring portion bends when the second movable iron piece 12B moves toward the second fixed iron piece 11B, and generates an elastic force that moves the second movable iron piece 12B in a direction away from the second fixed iron piece 11B.

[0073] The second movable iron piece 12B is attached to the second holder 13B and is configured to rotate around the center point P3 toward the second fixed iron piece 11B due to the attraction force generated when the current value of the power supplied from the external power source to the load becomes higher than a second threshold value.

[0074] The second pushing portion 14B pushes the second latch portion 3B toward the second non-latching position when an abnormality occurs in the power supplied to the first electric circuit L1. In this embodiment, since the common latch portion 3 also serves as the second latch portion 3B, the second pushing portion 14B pushes the common latch portion 3 toward the common non-latching position when an abnormality occurs in the power supplied to the first electric circuit L1. The second pushing portion 14B pushes the common latch portion 3 from the common latch position to the common non-latching position in conjunction with the second movable iron piece 12B moving toward the second fixed iron piece 11B. More specifically, the second pushing portion 14B pushes the second portion 33B (see FIG. 8A and FIG. 8B) of the common latch portion 3 upward, thereby pushing the common latch portion 3 from the common latch position to the common non-latching position. The second portion 33B pushed by the second pushing portion 14B is a portion different from the first portion 33A pushed by the first pushing portion 14A. With this configuration, there is no need to place the first pushing portion 14A and the second pushing portion 14B close to each other inside the container body 5, which has the advantage of providing greater freedom in placing the first pushing portion 14A and the second pushing portion 14B inside the container body 5.

[0075] In the second tripping part 1B of this embodiment, the second movable iron piece 12B also serves as the second pushing part 14B. When the second movable iron piece 12B rotates around the center point P3 toward the second fixed iron piece 11B, the upper surface of the second movable iron piece 12B pushes the second part 33B (see FIGS. 8A and 8B) of the common latch part 3 upward.

[0076] In this embodiment, as shown in FIG. 1, the first tripping unit 1A and the second tripping unit 1B are arranged so that the first longitudinal direction D1 and the second longitudinal direction D2 cross each other when viewed from a direction (left-right direction) perpendicular to both the first longitudinal direction D1 of the first movable iron piece 12A and the second longitudinal direction D2 of the second movable iron piece 12B. In other words, the first tripping unit 1A and the second tripping unit 1B are arranged so that the first longitudinal direction D1 and the second longitudinal direction D2 are not parallel when viewed from a direction (left-right direction) perpendicular to both the first longitudinal direction D1 of the first movable iron piece 12A and the second longitudinal direction D2 of the second movable iron piece 12B. This configuration has the effect of efficiently arranging the first tripping unit 1A and the second tripping unit 1B. That is, there is an advantage that the tripping device 1 can be made smaller.

[0077] (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.

[0078] 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 a contact portion 34 (see FIG. 7) of the latch member 30, 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.

[0079] (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.

[0080] 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.

[0081] 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.

[0082] (3) Advantages In this embodiment, the tripping device 1 is equipped with a first tripping unit 1A and a second tripping unit 1B that move the common latch unit 3 toward the common non-latch position when an abnormality occurs in the power supplied from an external power source to a load, as shown in Figures 1 and 2.

[0083] According to the above configuration, the tripping device 1 of this embodiment has an advantage that the tripping force is higher than that of a comparative example tripping device having only one tripping section.

[0084] The advantages of the tripping device 1 of this embodiment will be described more specifically below with reference to FIG. 9. Graph G1 shown in FIG. 9 shows the change in tripping force due to the current flowing through the main circuit in the tripping device 1 of this embodiment. Also, dashed line L1 shown in FIG. 9 shows the change in tripping force due to the current flowing through the main circuit, assuming that the tripping device according to the comparative example has only the first tripping unit 1A, and dashed line L2 shows the change in tripping force due to the current flowing through the main circuit, assuming that the tripping device according to the comparative example has only the second tripping unit 1B. Note that "current IA" shown in FIG. 9 shows the current that moves the first movable iron piece 12A toward the first fixed iron piece 11A in the first tripping unit 1A (i.e., the current whose value is the first threshold value described above). 9 indicates a current at which the second movable iron piece 12B moves toward the second fixed iron piece 11B in the second tripping unit 1B (i.e., a current whose current value is the above-mentioned second threshold value). In this embodiment, the current value (second threshold value) of the current IB is higher than the current value (first threshold value) of the current IA.

[0085] As shown in FIG. 9, the tripping force (graph G1) in the tripping device 1 of this embodiment is the sum of the tripping force (dashed line L1) in the tripping device having only the first tripping unit 1A and the tripping force (chain line L2) in the tripping device having only the second tripping unit 1B. That is, the tripping device 1 of this embodiment has an advantage of having a higher tripping force than a tripping device having either the first tripping unit 1A or the second tripping unit 1B. More specifically, the tripping device 1 of this embodiment has an advantage of having a higher tripping force than a tripping device having either the first tripping unit 1A or the second tripping unit 1B when the current value of the current flowing through the main circuit is higher than both the current value of the current IA (first threshold value) and the current value of the current IB (second threshold value) (that is, in this embodiment, when the current value of the current flowing through the main circuit is higher than the current value of the current IB). In short, the tripping force of the tripping device 1 of this embodiment has the advantage that it is higher on the high current side than the tripping force of a tripping device equipped with either the first tripping unit 1A or the second tripping unit 1B.

[0086] (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.

[0087] In the above embodiment, the tripping device 1 includes a first tripping unit 1A and a second tripping unit 1B. That is, the tripping device 1 includes two tripping units. However, the tripping device 1 may include three or more tripping units. As the number of tripping units included in the tripping device 1 increases, the tripping force of the tripping device 1 increases.

[0088] In the above-described embodiment, the first tripping unit 1A is disposed on the second electric circuit L2, and the second tripping unit 1B is disposed on the first electric circuit L1. However, the first tripping unit 1A may be disposed on the first electric circuit L1, and the second tripping unit 1B may be disposed on the second electric circuit L2. In addition, both the first tripping unit 1A and the second tripping unit 1B may be disposed on the first electric circuit L1 or on the second electric circuit L2.

[0089] Also, in the above-described embodiment, the second threshold value of the second tripping unit 1B is higher than the first threshold value of the first tripping unit 1A, but it may be lower than the first threshold value of the first tripping unit 1A or may be the same as the first threshold value of the first tripping unit 1A.

[0090] In the above embodiment, the first tripping unit 1A and the second tripping unit 1B are arranged so that the first longitudinal direction D1 and the second longitudinal direction D2 intersect when viewed from a direction (left-right direction) perpendicular to both the first longitudinal direction D1 of the first movable iron piece 12A and the second longitudinal direction D2 of the second movable iron piece 12B. However, the first tripping unit 1A and the second tripping unit 1B may be arranged so that the first longitudinal direction D1 and the second longitudinal direction D2 are parallel when viewed from a direction (left-right direction) perpendicular to both the first longitudinal direction D1 of the first movable iron piece 12A and the second longitudinal direction D2 of the second movable iron piece 12B.

[0091] In the above-described embodiment, the first latch section 3A and the second latch section 3B are a single common latch section 3 that functions as the first latch section 3A and the second latch section 3B. However, the first latch section 3A and the second latch section 3B may be separate entities.

[0092] In the above embodiment, the second portion 33B of the common latch portion 3 pressed by the second pushing portion 14B is a portion different from the first portion 33A pressed by the first pushing portion 14A, but it may be the same portion as the first portion 33A. In other words, the first pushing portion 14A and the second pushing portion 14B may push the same portion of the common latch portion 3.

[0093] In the above embodiment, both of the two terminals 7 are screw-type terminals, but this is not limited thereto. 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.

[0094] (summary) A first aspect of the tripping device (1) is a tripping device that, when an abnormality occurs in the power supplied from an external power source to a load via a contact section (2), moves a first latch section (3A) from a first latch position toward a first non-latch position and moves a second latch section (3B) from a second latch position toward a second non-latch position, thereby opening the contact section (2). The tripping device (1) includes a first tripping section (1A) and a second tripping section (1B). The first tripping section (1A) moves the first latch section (3A) toward the first non-latch position. The second tripping section (1B) is separate from the first tripping section (1A) and moves the second latch section (3B) toward the second non-latch position. The first tripping part (1A) has a first fixed iron piece (11A), a first movable iron piece (12A), and a first pushing part (14A). The first movable iron piece (12A) is configured to move toward the first fixed iron piece (11A) when an abnormality occurs. The first pushing part (14A) is linked to the first movable iron piece (12A) moving toward the first fixed iron piece (11A) and pushes the first latch part (3A) toward the first non-latching position. The second tripping part (1B) has a second fixed iron piece (11B), a second movable iron piece (12B), and a second pushing part (14B). The second movable iron piece (12B) is configured to move toward the second fixed iron piece (11B) when an abnormality occurs. The second pushing portion (14B) moves in conjunction with the second movable iron piece (12B) moving toward the second fixed iron piece (11B) to push the second latch portion (3B) toward the second non-latching position.

[0095] According to this embodiment, there is an advantage that a strong pulling force is generated by the movement of the movable iron piece toward the fixed iron piece.

[0096] In the tripping device (1) of the second aspect, in the first aspect, the first tripping unit (1A) is configured such that the first movable iron piece (12A) moves toward the first fixed iron piece (11A) when the current value of the power becomes higher than a first threshold. The second tripping unit (1B) is configured such that the second movable iron piece (12B) moves toward the second fixed iron piece (11B) when the current value of the power becomes higher than a second threshold. The second threshold is higher than the first threshold.

[0097] According to this embodiment, there is an advantage that malfunction of the tripping device (1) can be suppressed.

[0098] In the tripping device (1) of the third aspect, the first latch portion (3A) and the second latch portion (3B) in the first or second aspect are a single common latch portion (3) that functions as the first latch portion (3A) and the second latch portion (3B). The first pushing portion (14A) and the second pushing portion (14B) push the common latch portion (3) toward a common non-latch position, which is the first non-latch position and the second non-latch position.

[0099] According to this embodiment, there is an advantage that the tripping force of the tripping device (1) can be prevented from decreasing.

[0100] In the fourth aspect of the tripping device (1) of the third aspect, the first pushing portion (14A) pushes in the first portion (33A) of the common latch portion (3), and the second pushing portion (14B) pushes in the second portion (33B) different from the first portion (33A) of the common latch portion (3).

[0101] This embodiment has the advantage of increasing the degree of freedom in arranging the first pushing portion (14A) and the second pushing portion (14B).

[0102] The tripping device (1) of the fifth aspect is any one of the first to fourth aspects, in which the first movable iron piece (12A) and the second movable iron piece (12B) are each a long plate member. The first tripping part (1A) and the second tripping part (1B) are arranged such that the first longitudinal direction (D1) and the second longitudinal direction (D2) intersect when viewed from a direction perpendicular to both the first longitudinal direction (D1) of the first movable iron piece (12A) and the second longitudinal direction (D2) of the second movable iron piece (12B).

[0103] According to this embodiment, there is an advantage that the tripping device (1) can be made compact.

[0104] A circuit breaker (10) of a sixth aspect includes the tripping device (1) of any one of the first to fourth aspects, a first terminal portion (7A), a second terminal portion (7B), a contact portion (2), a first latch portion (3A), and a second latch portion (3B). The first terminal portion (7A) is electrically connected to an external power source. The second terminal portion (7B) is electrically connected to a load. The contact portion (2) is inserted in an electric path between the first terminal portion (7A) and the second terminal portion (7B). The first latch portion (3A) is pushed toward a first non-latching position by the first pushing portion (14A). The second latch portion (3B) is pushed toward a second non-latching position by the second pushing portion (14B).

[0105] According to this aspect, 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 toward the fixed iron piece.

[0106] The seventh aspect of the circuit breaker (10) is the sixth aspect, in which the first tripping unit (1A) is arranged in the second electrical circuit (L2) between the contact unit (2) and the second terminal unit (7B). The second tripping unit (1B) is arranged in the first electrical circuit (L1) between the first terminal unit (7A) and the contact unit (2).

[0107] According to this embodiment, there is an advantage that an abnormality in the power supplied from the external power supply to the load can be detected more accurately and the contact portion (2) can be opened.

[0108] In the circuit breaker (10) of the eighth aspect, in the seventh aspect, the first pushing portion (14A) pushes the first latch portion (3A) toward the first non-latching position when an abnormality occurs in the power supplied to the second electric circuit (L2), and the second pushing portion (14B) pushes the second latch portion (3B) toward the second non-latching position when an abnormality occurs in the power supplied to the first electric circuit (L1).

[0109] According to this embodiment, there is an advantage that the pulling force generated by the movement of the movable iron piece toward the fixed iron piece can be increased.

[0110] A distribution board (100) of a ninth aspect includes the circuit breaker (10) of any one of the sixth to eighth aspects and a cabinet (93) that houses the circuit breaker (10).

[0111] According to this aspect, there is an advantage in that it is possible to provide a distribution board in which a strong pull-out force is generated by the movement of the movable iron piece toward the fixed iron piece. [Explanation of symbols]

[0112] 100 Distribution Board 10. Circuit Breakers 1. Release device 1A First tripping section 11A 1st fixed iron piece 12A First moving iron piece 14A First Push-in Section 1B Second tripping section 11B 2nd fixed iron piece 12B Second moving iron piece 14B Second pushing part 2 Contact area 3 Common latch section 3A First latch section 3B Second latch section 33A Part 1 33B 2nd part 7A 1st terminal section 7B 2nd terminal section 93 Cabinet D1 First longitudinal direction D2 Second longitudinal direction L1 First circuit L2 Second circuit

Claims

1. A tripping device which, when an abnormality occurs in power supplied from an external power source to a load via a contact section, opens the contact section by moving a first latch section from a first latch position toward a first non-latching position and moving a second latch section from a second latch position toward a second non-latching position, a first tripping portion that moves the first latching portion toward the first unlatched position; a second tripping portion separate from the first tripping portion and configured to move the second latching portion toward the second unlatched position, The first tripping unit includes: A first fixed iron piece; A first movable iron piece configured to move toward the first fixed iron piece when the abnormality occurs; a first pushing portion that pushes the first latch portion toward the first non-latching position in association with the first movable iron piece moving toward the first fixed iron piece, The second tripping unit includes: A second fixed iron piece; A second movable iron piece configured to move toward the second fixed iron piece when the abnormality occurs; a second pushing portion that pushes the second latch portion toward the second non-latching position in association with the second movable iron piece moving toward the second fixed iron piece, Release device.

2. the first tripping unit is configured such that, when a current value of the power becomes higher than a first threshold value, the first movable iron piece moves toward the first fixed iron piece; the second tripping unit is configured to move the second movable iron piece toward the second fixed iron piece when a current value of the power becomes higher than a second threshold value; The second threshold is higher than the first threshold. The tripping device according to claim 1.

3. the first latch unit and the second latch unit are a single common latch unit that functions as the first latch unit and the second latch unit, the first pushing portion and the second pushing portion push the common latch portion toward a common non-latching position, which is the first non-latching position and the second non-latching position; The tripping device according to claim 1.

4. the first pushing portion pushes a first portion of the common latch portion; the second pushing portion pushes a second portion of the common latch portion that is different from the first portion; The tripping device according to claim 3.

5. Each of the first movable iron piece and the second movable iron piece is a long plate member, The first tripping portion and the second tripping portion are arranged such that, when viewed from a direction perpendicular to both the first longitudinal direction of the first movable iron piece and the second longitudinal direction of the second movable iron piece, the first longitudinal direction and the second longitudinal direction intersect with each other. The tripping device according to claim 1 .

6. 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 first latch portion being pushed toward the first unlatched position by the first pushing portion; the second latch portion being pushed toward the second unlatched position by the second pushing portion, Circuit breaker.

7. the first tripping portion is disposed in a second electrical path between the contact portion and the second terminal portion, The second tripping portion is disposed in a first electrical path between the first terminal portion and the contact portion.

7. The circuit breaker of claim 6.

8. the first pushing portion pushes the first latch portion toward the first unlatched position when an abnormality occurs in the power supplied to the first electric circuit; the second pushing portion pushes the second latch portion toward the second unlatched position when an abnormality occurs in the power supplied to the second electric circuit.

8. The circuit breaker of claim 7.

9. A circuit breaker according to claim 6; a cabinet housing the circuit breaker; Distribution board.

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