Tripping device, circuit breaker and distribution board

Abstract

The purpose of the present invention is to provide a trip device, a circuit breaker, and a distribution board, all of which make it easier to ensure that the temperature is high enough to trip an indirectly heated bimetallic plate. The tripping device (1) comprises a fixed iron sheet (11), a movable iron sheet (12), a push-in part (14), an electric circuit (L1) and an indirectly heated bimetallic plate (4). The bimetallic plate (4) is configured to displace the push-in portion (14) to a point at which the latch portion (3) is pushed in from the latched position toward the non-latched position when deformed by heat generated by the circuit (L1). The bimetallic plate (4) is interposed between a part of the fixed iron piece (11) and the movable iron piece (12).

Description

TECHNICAL FIELD

[0001] The present disclosure relates generally to trip devices, circuit breakers, and switchboards, and more particularly to a trip device configured to cause a contact section to open when an abnormal electrical condition occurs, and a circuit breaker and a switchboard each including such a trip device. BACKGROUND

[0002] JP 2008-130381A discloses a circuit breaker including a fixed iron sheet, a movable iron sheet, and a resilient member. The fixed iron sheet is formed by fixing a movable electromagnetic sheet to a band plate extending from a power source side terminal fitting and arranging the movable electromagnetic sheet in parallel with the band plate. The movable iron sheet is configured to face the fixed iron sheet with the band plate interposed therebetween and to open and close with respect to the fixed iron sheet. The resilient member is provided to return the movable iron sheet to its open position. In this circuit breaker, the movable iron sheet is mounted to a main body of the resilient member. Projecting coupling pieces are pivotally mounted to left and right end portions of the fixed iron sheet across the band plate in a left-right direction. The circuit breaker is configured such that the movable iron sheet is pivoted in a closing direction by a magnetic force generated when an excess current flows through a circuit, thereby allowing a user to operate a trip member of the circuit breaker.

[0003] A trip device included in such a circuit breaker sometimes includes an indirectly heated bimetallic plate instead of a directly heated bimetallic sheet (bimetallic plate). In this case, the indirectly heated bimetallic plate itself does not generate heat, and thus it is difficult to ensure a sufficiently high temperature to trip the indirectly heated bimetallic plate. SUMMARY

[0004] PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] Accordingly, an object of the present disclosure is to provide a trip device, a circuit breaker, and a switchboard, each of which makes it easier to ensure a sufficiently high temperature to trip an indirectly heated bimetallic plate.

[0006] SOLUTION TO THE PROBLEM

[0007] A trip device according to one aspect of the present disclosure is configured to cause a contact section to open by displacing a latch section from a latched position to an unlatched position when an abnormal condition of electricity supplied from an external power source to a load via the contact section occurs. The trip device includes a fixed iron sheet, a movable iron sheet, a push-in section, an electric circuit, and an indirectly heated bimetallic plate. The movable iron sheet is configured to move toward the fixed iron sheet when the abnormal condition occurs. The push-in section pushes the latch section from the latched position to the unlatched position in synchronization with the movement of the movable iron sheet toward the fixed iron sheet. The electric circuit is interposed between a portion of the fixed iron sheet and the movable iron sheet to supply electricity. The bimetallic plate is configured to displace the push-in section to a point of pushing the latch section from the latched position to the unlatched position when deformed under heat generated in the electric circuit. The bimetallic plate is interposed between the portion of the fixed iron sheet and the movable iron sheet.

[0008] The circuit breaker according to another aspect of the present disclosure includes the above-described tripping device, a contact portion, and a latch portion. The contact portion is inserted into a circuit. The latch portion causes the contact portion to be opened when the push-in portion is pushed from the latched position to the unlatched position.

[0009] The distribution board according to still another aspect of the present disclosure includes the above-described circuit breaker and a cabinet in which the circuit breaker is housed.

[0010] Effects of Invention

[0011] The present disclosure achieves the advantage of making it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic strip. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a plan view showing the internal configuration of the circuit breaker according to the exemplary embodiment in a state in which its contact portion is closed, with the first block removed;

[0013] Figure 2 is a plan view showing the internal configuration of the circuit breaker in a state in which its contact portion is opened, with the first block removed;

[0014] Figure 3 shows the appearance of a distribution board including the circuit breaker;

[0015] Figure 4 is a perspective view of the circuit breaker;

[0016] Figure 5 is a perspective view showing the appearance of a tripping device included in the circuit breaker; and

[0017] Figure 6 is a sectional view of the tripping device included in the circuit breaker. DETAILED DESCRIPTION

[0018] Note that the embodiments to be described below and modifications thereof are merely exemplary embodiments and modifications of various embodiments of the present disclosure and should not be construed as limiting. On the contrary, the exemplary embodiments and modifications can be easily modified in various ways according to design choice or any other factor without departing from the true spirit and scope of the present disclosure. The drawings to be referred to in the following description of the embodiments and modifications are all schematic representation drawings. Therefore, the ratio of the dimensions (including thicknesses) of the respective constituent elements shown in the drawings does not always reflect the actual ratio of the dimensions thereof.

[0019] (Embodiments)

[0020] (1) SUMMARY

[0021] First, with reference to Figure 1 and Figure 2An overview of the trip device 1 according to the exemplary embodiment will be described.

[0022] The trip device 1 according to the present embodiment is provided inside the circuit breaker 10. The trip device 1 is configured to cause the contact portion 2 to open by displacing the latch portion 3 from a latching position to a non-latching position when an abnormal condition occurs in the power supplied from the external power source to the load via the contact portion 2. As used herein, the "latching position" refers to a position in which the latch portion 3 causes the contact portion 2 to close as shown in Figure 1 As used herein, the "non-latching position" refers to a position in which the latch portion 3 causes the contact portion 2 to open as shown in Figure 2

[0023] The trip device 1 includes a fixed iron piece 11, a movable iron piece 12, a push-in portion 14, a circuit L1, and an indirectly heated bimetallic strip 4 as shown in Figure 1 and Figure 2 The movable iron piece 12 is configured to move toward the fixed iron piece 11 when an abnormal condition occurs in the power supplied from the external power source to the load via the contact portion 2. The push-in portion 14 pushes the latch portion 3 from the latching position to the non-latching position in synchronization with the movement of the movable iron piece 12 toward the fixed iron piece 11. The circuit L1 is provided to supply power from the external power source to the load via the contact portion 2. The circuit L1 is interposed between a portion of the fixed iron piece 11 and the movable iron piece 12. The bimetallic strip 4 is configured to displace the push-in portion 14 to a point of pushing the latch portion 3 from the latching position to the non-latching position when deformed under heat generated in the circuit L1. The bimetallic strip 4 is interposed between a portion of the fixed iron piece 11 and the movable iron piece 12. As used herein, the "indirectly heated bimetallic strip" refers to a bimetallic strip that is deformed under heat generated by a member arranged around itself (i.e., a member other than itself), unlike a directly heated bimetallic strip that is deformed under heat generated by itself.

[0024] It can be seen that the trip device 1 according to the present embodiment allows heat generated in the circuit L1 to be cut off by the fixed iron piece 11 and the movable iron piece 12. Therefore, the trip device 1 according to the present embodiment achieves the advantage of making it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic strip 4.

[0025] (2) Detailed Configuration

[0026] Next, the detailed configuration of the trip device 1, the circuit breaker 10, and the distribution board 100 according to the present embodiment will be described with reference to Figures 1 to 6

[0027] (2-1) Distribution Board

[0028] The distribution board 100 according to the present embodiment includes a main circuit breaker 91, a plurality of (e.g., in Figure 3 Figure 3 ​​​The example shown includes 12 branch circuit breakers 92, a cabinet 93, and an outer cover (not shown). In this embodiment, each of the multiple branch circuit breakers 92 is a circuit breaker 10. The distribution board 100 can be installed, for example, in a residential (or non-residential) setting.

[0029] Cabinet 93 can be made of, for example, synthetic resin. For example, cabinet 93 is formed as follows: Figure 3 The cabinet 93 is shown in the shape of a box with an open front surface and is intended for mounting on a residential wall. The cabinet 93 houses a main circuit breaker 91 and multiple branch circuit breakers 92 (i.e., circuit breakers 10). More specifically, the cabinet 93 has space for housing the main circuit breaker 91 and the multiple branch circuit breakers 92 (i.e., circuit breakers 10). An outer cover is attached to the cabinet 93 and is movable between a position where the outer cover closes the front surface of the cabinet 93 and a position where the outer cover opens the front surface of the cabinet 93.

[0030] The main circuit breaker 91 includes primary side terminals and secondary side terminals. An external power source is electrically connected to the primary side terminals of the main circuit breaker 91. As used herein, "external power source" refers to a power source supplying power to the load and can be, for example, mains power (i.e., commercial power). The distribution board 100 according to this embodiment is expected to use a single-phase three-wire system as its power distribution system. Therefore, the leads of the single-phase three-wire system of the mains power (commercial power) are electrically connected to the primary side terminals of the main circuit breaker 91. That is, in this embodiment, the main circuit breaker 91 has two hot wires and one neutral line. On the other hand, each circuit breaker 10 is electrically connected to the secondary side terminals of the main circuit breaker 91.

[0031] Multiple circuit breakers 10 are divided into two groups, respectively positioned above and below the conductive rod of the neutral line. Each group of circuit breakers 10 (e.g., Figure 3 The six circuit breakers 10 in the example shown are arranged side by side in the left-right direction. Each circuit breaker 10 also has primary side terminals and secondary side terminals.

[0032] The secondary terminals of the main circuit breaker 91 are electrically connected to the primary terminals of each circuit breaker 10. That is, an external power source is electrically connected to the primary terminals of each circuit breaker 10 via the main circuit breaker 91. Furthermore, one or more loads are electrically connected to the secondary terminals of each circuit breaker 10. As used herein, "load" includes not only electrical equipment such as lighting fixtures and hot water supply systems, but also wiring devices such as sockets and wall switches. Circuit breaker 10 will be described in further detail later in the "(2-2) Circuit Breakers" section.

[0033] (2-2) Circuit Breaker

[0034] (2-2-1) Overall Structure

[0035] likeFigure 1 and Figure 2 As shown, the circuit breaker 10 includes a tripping device 1, a contact part 2, a latching part 3 (including an operating handle 6), a main body 5, a pair of terminal parts 7, a fixed contact plate 81, and a braided wire 82.

[0036] The circuit breaker 10 has the capability to interrupt the current flowing from an external power source to the load (i.e., the current flowing through the main circuit) by rotating the contact portion 2 from the closed position to the open position when any short-circuit current or overcurrent (such as overload current) is detected. Furthermore, the circuit breaker 10 is configured to rotate the contact portion 2 from the closed position to the open position in response to a command manually input via the operating handle 6, and vice versa. If the user can confirm a safe condition after disconnecting the contact portion 2 upon detecting an abnormal current, the user can close the contact portion 2, for example, by rotating the operating handle 6. According to this embodiment, the main circuit is the circuit L1 that supplies power to the load from an external power source. As will be explained later, the main circuit is the circuit L1 between the first terminal portion 7A and the second terminal portion 7B, where the first terminal portion 7A is one of a pair of terminal portions 7, and the second terminal portion 7B is the other terminal portion of the pair of terminal portions 7. The circuit L1 (i.e., the main circuit) consists of a fixed contact plate 81, a latch portion 3, a braided wire 82, and other components.

[0037] (2-2-2) Main Body

[0038] Main body 5 is as follows Figure 4 The circuit breaker 10 is shown in a generally flat, essentially rectangular box shape. In the following description, the direction consistent with the thickness of the main body 5 will be referred to as the "left-right direction" of the circuit breaker 10. Additionally, in the following description, as... Figure 1 The direction in which the pair of terminal portions 7 shown are configured with one overlapping the other will be referred to hereinafter as the "vertical direction". In the following description, "lower side" refers to the lower side of the circuit breaker 10 when viewed from the front. Similarly, "right side" refers to the right side of the circuit breaker 10 when viewed from the front, and "left side" refers to the left side of the circuit breaker 10 when viewed from the front. Furthermore, in the following description, the direction perpendicular to both the vertical and horizontal directions will be referred to hereinafter as the "front-back direction". The side of the body 5 where the operating handle 6 is located will be referred to hereinafter as the "front side" of the body 5. Note that these directions should not be construed as limiting the direction in which the circuit breaker 10 is intended to be used.

[0039] like Figure 4 As shown, the main body 5 includes a first block 5A (right side block) and a second block 5B (left side block). The first block 5A and the second block 5B are made of a synthetic resin material with electrical insulating properties.

[0040] The main body 5 houses therein the trip device 1, the contact portion 2, the latch portion 3, the bimetallic plate 4, the operation handle 6, the pair of terminal portions 7, the fixed contact plate 81, and the braided wire 82. Further, as shown in Figure 1 、 Figure 2 and Figure 4 , the main body 5 supports the operation handle 6 in such a manner that a portion of the operation handle 6, that is, the lever 61 of the operation handle 6, is exposed to the outside space through a front wall 55 of the main body 5. As shown in Figure 4 , the front wall 55 protrudes forward in such a manner that a middle portion thereof in the up-and-down direction is protruded, and the lever 61 is exposed to the outside space through a window hole 56 of the protruded middle portion.

[0041] The first block 5A and the second block 5B are formed in the shape of a substantially rectangular parallelepiped tank whose surfaces facing each other are open. The first block 5A and the second block 5B are combined together by the first block 5A and the second block 5B abutting against each other.

[0042] (2-2-3) Terminal Portions

[0043] As shown in Figure 1 and Figure 2 , a first terminal portion 7A that is one of the pair of terminal portions 7 is housed in an upper end portion inside the main body 5, and a second terminal portion 7B that is the other of the pair of terminal portions 7 is housed in a lower end portion inside the main body 5. In the following description, a cable on the side of an external power source such as a commercial power source is assumed to be electrically connected to the first terminal portion 7A, and a cable on the side of a load is assumed to be electrically connected to the second terminal portion 7B. That is, the first terminal portion 7A is assumed to be a primary side terminal electrically connected to a secondary side terminal of the main breaker 91, and the second terminal portion 7B is assumed to be a secondary side terminal electrically connected to the load. Alternatively, the cable on the side of the load can be electrically connected to the first terminal portion 7A, and the cable on the side of the external power source can be electrically connected to the second terminal portion 7B.

[0044] The first terminal portion 7A and the second terminal portion 7B are so-called "post terminals (bolt terminals)", which can be hard wiring utilizing, for example, a bolt. As shown in Figure 1 , the first terminal portion 7A includes a terminal plate 71, a terminal fitting 72, and a terminal bolt 73. The second terminal portion 7B includes the terminal fitting 72 and the terminal bolt 73.

[0045] The terminal plate 71 is formed in the shape of a substantially L plate by a metal plate having electrical conductivity. The terminal plate 71 is fixed inside the main body 5.

[0046] The terminal fitting 72 is formed in the shape of a square tube from a metal plate having electrical conductivity. The axis of the terminal fitting 72 is defined in the up-down direction, and both ends thereof are open in the up-down direction. The terminal fitting 72 of the first terminal portion 7A is movable within a predetermined range in the front-rear direction inside the main body 5 with a portion of the terminal plate 71 (i.e., the tab 711) inserted into the main body 5. On the other hand, the terminal fitting 72 of the second terminal portion 7B is movable within a predetermined range in the front-rear direction inside the main body 5 with a portion of the fixed contact plate 81 (i.e., the tab 811) inserted into the main body 5. The terminal fitting 72 has a threaded hole into which the terminal bolt 73 is screwed. The main body 5 has a plurality of (i.e., a total of two) insertion holes 51 into which cables are respectively inserted through respective portions of the main body 5, each of the insertion holes 51 overlapping a gap between the tab 711 (or the tab 811) and a bottom wall of the terminal fitting 72 when viewed in the up-down direction.

[0047] Each of the terminal bolts 73 is housed inside the main body 5 with the tip end thereof screwed into the threaded hole of the corresponding terminal fitting 72. The main body 5 has a plurality of (i.e., a total of two) holes 52 provided through the front wall 55 thereof. Each of these holes 52 is configured to overlap the head of the corresponding one of the terminal bolts 73 when viewed in the front-rear direction. Each of these holes 52 exposes the head of the corresponding terminal bolt 73 without allowing the terminal bolt 73 to fall out.

[0048] In the first terminal portion 7A, in the case where the cable on the external power source side is inserted through the insertion hole 51 into the gap between the tab 711 and the bottom wall of the terminal fitting 72, the terminal bolt 73 is fastened by turning the tip end of a tool such as a screwdriver inserted through the hole 52 to move the terminal fitting 72 forward, thereby narrowing the distance between the tab 711 and the bottom wall of the terminal fitting 72. As a result, the cable on the external power source side inserted into the gap can be connected to the terminal portion 7.

[0049] In the same manner, in the second terminal portion 7B, in the case where the cable on the load side is inserted through the insertion hole 51 into the gap between the tab 811 and the bottom wall of the terminal fitting 72, the terminal bolt 73 is fastened by turning the tip end of a tool such as a screwdriver inserted through the hole 52 to move the terminal fitting 72 forward, thereby narrowing the distance between the tab 811 and the bottom wall of the terminal fitting 72. As a result, the cable on the load side inserted into the gap can be connected to the terminal portion 7.

[0050] (2-2-4) Contact portion

[0051] Contact 2 is configured to disconnect when an abnormal condition occurs during power supply from an external power source to the load via contact 2. More specifically, contact 2 is configured to disconnect in response to the occurrence of an abnormal current in the main circuit (e.g., leakage current, short-circuit current, and overload current in this example), thereby switching the main circuit from a conductive state to a non-conductive state. Contact 2 is inserted into circuit L1 between the first terminal 7A and the second terminal 7B.

[0052] like Figure 1 and Figure 2 As shown, the contact part 2 includes a fixed contact 2A and a movable contact 2B, the movable contact 2B being configured to selectively contact or detach from the fixed contact 2A. Figure 1 The closed state of contact part 2 is shown. On the other hand, Figure 2 The state of contact part 2 being disconnected is shown.

[0053] Fixed contact 2A is configured as fixed contact plate 81. More specifically, fixed contact 2A is a recess provided for fixed contact plate 81. Alternatively, fixed contact 2A may also be a protrusion provided for fixed contact plate 81. Fixed contact plate 81 is made of a material with low resistance, such as iron or copper. Fixed contact plate 81 forms part of circuit L1 (i.e., the main circuit).

[0054] A movable contact 2B is disposed at one end of the arm 31 (movable armature) of the latch portion 3, which is formed by stamping and bending a metal plate. The movable contact 2B is an integral part of the arm 31. Alternatively, the movable contact 2B may be disposed separately from the arm 31 and fixed to one end of the arm 31. The arm 31 forms part of the circuit L1.

[0055] On the shaft 32 located at the other end of the arm 31, the arm 31 can be positioned where the movable contact 2B contacts the fixed contact 2A (see reference). Figure 1 ) and the position where the movable contact 2B is no longer in contact with the fixed contact 2A (refer to Figure 2 The braided wire 82 pivots between the two terminals. One end of the braided wire 82 is fixed to the middle of the arm 31. The braided wire 82 forms part of the main circuit. The other end of the braided wire 82 is fixed to the terminal plate 71 of the first terminal portion 7A. The braided wire 82 forms part of the circuit L1.

[0056] With contact 2 closed, electricity supplied (i.e., output) from an external power source to the first terminal 7A passes through circuit L1, and is then supplied (i.e., input) to the load via the second terminal 7B. More specifically, electricity output from an external power source to the first terminal 7A passes through circuit L1 (specifically, sequentially through braided wire 82, latching part 3, and fixed contact plate 81), and is then input to the load via the second terminal 7B.

[0057] (2-2-5) Latch

[0058] The latching part 3 is configured to open or close the contact part 2 in response to an open operation (turn-off operation) or a close operation (turn-on operation). More specifically, the latching part 3 is configured to maintain the movable contact 2B in contact with the fixed contact 2A in response to an open operation or a close operation (see reference). Figure 1 (or the state where the movable contact 2B is out of contact with the fixed contact 2A (refer to) Figure 2 When the latch 3 is in the latched position (refer to...) Figure 1 When the latching part 3 closes the contact part 2, the latching part 3 maintains the state where the movable contact 2B is in contact with the fixed contact 2A. On the other hand, when the latching part 3 is in the non-latching position (see reference...), Figure 2 When the latching part 3 disconnects the contact part 2, the latching part 3 maintains the state in which the movable contact 2B and the fixed contact 2A are out of contact.

[0059] Furthermore, when the latching part 3 is pushed inward from the latched position to the non-latched position by the push-in part 14 (described later) of the tripping device 1, the latching part 3 disconnects the contact part 2. That is, the latching part 3 maintains the state in which the movable contact 2B is out of contact with the fixed contact 2A.

[0060] The latching part 3 includes an operating handle 6, a plurality of latching members 30, and an arm 31. The operating handle 6 is pivotally supported by the body 5, wherein the lever (operating lever) 61 of the operating handle 6 passes through a window hole 56 configured to pass through the front wall 55 of the body 5 (see reference). Figure 4 The lever 6 protrudes from the main body 5. Each latching member 30 connects the operating handle 6 to the arm 31. When the operating handle 6 is rotated, each latching member 30 causes the arm 31 to move synchronously. The operating handle 6 can be in the closed position of the contact portion 2 (see reference). Figure 1 ) and the off position where the contact part 2 is disconnected (refer to) Figure 2 It pivots between )

[0061] exist Figure 1 In the middle, the contact part 2 is closed and the lever 61 of the operating handle 6 tilts upward. On the other hand, in Figure 2 In the middle, the contact part 2 is disconnected and the lever 61 of the operating handle 6 tilts downward.

[0062] (2-2-6) Tripping device

[0063] The tripping device 1 is configured to actuate the latching part 3 when an abnormal condition occurs in the electricity supplied from the external power source to the load via the contact part 2, thereby forcibly disconnecting the contact part 2 (i.e., causing the movable contact 2B to trip from the fixed contact 2A). More specifically, the tripping device 1 is configured to actuate the latching part 3 when an abnormal current is detected in the main circuit, thereby forcibly disconnecting the contact part 2.

[0064] like Figure 5 and Figure 6 As shown, the tripping device 1 includes a fixed iron plate 11, a movable iron plate 12, a bracket 13, a push-in part 14, and a bimetallic plate 4. The tripping device 1 is arranged on the circuit L1. In this embodiment, the tripping device 1 is arranged on a fixed contact plate 81 that forms part of the circuit L1.

[0065] like Figure 6 As shown, the fixed iron plate 11 has a first surface X1, while the movable iron plate 12 has a second surface X2 facing the first surface X1. Circuit L1 is located between the first surface X1 and the second surface X2. In this embodiment, the first surface X1 of the fixed iron plate 11 and the second surface X2 of the movable iron plate 12 are substantially facing each other in the front-back direction.

[0066] The fixing iron plate 11 is made of magnetic material and is generally as follows: Figure 6 The U-shaped plate component is shown. More specifically, the fixing iron plate 11 has a first part 111, a second part 112, and a third part 113. The first part 111 is as follows: Figure 5 The illustrated plate member is rectangular and flat, and has a thickness that intersects the left-right direction (e.g., at a right angle in this example). In this embodiment, as... Figure 1 and Figure 2 As shown, the first portion 111 is housed inside the main body 5 with its upper end positioned in front of its lower end. That is, in this embodiment, the thickness of the first portion 111 is not aligned with the front-rear direction, but rather forms a small angle relative to the front-rear direction. For example... Figure 6 As shown, the first part 111 has a first surface X1 and also has a first end 1111 (right end) and a second end 1112 (left end). The first surface X1 is the front surface of the first part 111. Figure 6 As shown, the second part 112 is a generally rectangular plate member that protrudes forward from the first end 1111 (right end) of the first part 111 along the thickness of the first part 111. Similarly, as... Figure 6 As shown, the third part 113 is a generally rectangular plate member that protrudes forward from the second end 1112 (left end) of the first part 111 along the thickness of the first part 111. The second part 112 and the third part 113 face each other in the left-right direction. Figure 5 As shown, each of the second part 112 and the third part 113 includes an engaging portion 114, which is to be engaged by a rib (not shown) provided on the inner surface of the body 5. As used herein, "part of the fixed sheet 11" in the phrase "between a part of the fixed sheet 11 and the movable sheet 12" refers to the first part 111 of the fixed sheet 11.

[0067] like Figure 5 and Figure 6 As shown, the fixing plate 11 is housed inside the main body 5, such that the fixing contact plate 81 is inserted into the fixing plate 11. More specifically, the fixing plate 11 is housed inside the main body 5, such that the fixing contact plate 81 is inserted between the second part 112 and the third part 113 in the left-right direction.

[0068] The movable iron plate 12 is configured to move toward the fixed iron plate 11 when an abnormality occurs in the electrical supply from an external power source to the load via the contact portion 2. The movable iron plate 12 is made of a magnetic material and is a slender, rectangular plate member. Figure 1 As shown, the thickness of the movable iron plate 12 is not consistent with the front-back direction, but forms a small tilt angle relative to the front-back direction. When the movable iron plate 12 is viewed in the left-right direction, the thickness of the movable iron plate 12 intersects with the thickness of the first portion 111 of the fixed iron plate 11. More specifically, when the movable iron plate 12 is viewed in the left-right direction before it begins to move toward the fixed iron plate 11 (i.e., in the closed state of the contact portion 2), the thickness of the movable iron plate 12 intersects the front-back direction at an angle larger than the thickness of the first portion 111. The surface positioned closer to the fixed iron plate 11 (i.e., the rear surface of the movable iron plate 12) of the two surfaces facing each other along the thickness of the movable iron plate 12 is the second surface X2 facing the first surface X1 (see reference). Figure 6 ).

[0069] The movable iron plate 12 is housed inside the main body 5, so that when viewed from the left and right sides with the contact part 2 closed, it appears as if... Figure 1 As shown, the gap between the rear surface of the movable iron plate 12 and the front surface of the second part 112 of the fixed iron plate 11 gradually increases from the first end (i.e., the lower end) of the rear surface of the movable iron plate 12 toward its second end (the upper end). Furthermore, the movable iron plate 12 is also housed inside the main body 5, such that the fixed contact plate 81 (see reference...) Figure 5 and Figure 6 It is inserted between the movable iron plate 12 and the first part 111 of the fixed iron plate 11 along the thickness of the movable iron plate 12.

[0070] In this embodiment, the movable iron piece 12 is configured such that when the current value of the electricity supplied to the load from an external power source becomes higher than a threshold, a magnetic circuit is formed through the fixed iron piece 11 and the movable iron piece 12, and the fixed iron piece 11 and the movable iron piece 12 are magnetized, thereby generating a magnetic attraction force (magnetic force). The fixed iron piece 11 uses this magnetic attraction force to attract the movable iron piece 12, causing the movable iron piece 12 to move toward the fixed iron piece 11. More specifically, when the current value of the electricity flowing through the fixed contact plate 81 becomes higher than a threshold, the fixed iron piece 11 and the movable iron piece 12 are housed around the fixed contact plate 81 and are therefore magnetized. As a result, the movable iron piece 12 moves toward the fixed iron piece 11. According to this configuration, it is not necessary to provide any structure for detecting abnormal conditions of the electricity supplied to the load from an external power source or for making the fixed iron piece 11 attract the movable iron piece 12 by means other than magnetism, thus achieving the advantage of simplifying the construction of the tripping device 1.

[0071] The bracket 13 is a component for mounting the movable iron plate 12. The bracket 13 moves synchronously with the movable iron plate 12, which moves toward the fixed iron plate 11. That is, the bracket 13 moves as the movable iron plate 12 moves toward the fixed iron plate 11.

[0072] like Figure 5 As shown, the bracket 13 according to this embodiment includes a base 130, a mounting portion 131, a connecting portion 132, and a return spring portion 133. The base 130 according to this embodiment is a plate member with a substantially rectangular shape. A movable iron plate 12 is held on the rear surface of the base 130. The mounting portion 131 mounts the base 130 inside the main body 5, allowing the base 130 to rotate about a center point P1 (see reference). Figure 1 and Figure 2 The mounting part 131 is provided at the lower end of the base 130. According to this embodiment, the mounting part 131 is rod-shaped and is fitted to a boss 58 (see reference 58) provided inside the main body 5. Figure 1 and Figure 2 The connecting part 132 is the part for connecting to the push-in part 14. The connecting part 132 is provided at the upper end of the base 130. The return spring part 133 can be constructed as, for example, a coil spring, and is provided above the front surface of the base 130. When the movable iron plate 12 moves toward the fixed iron plate 11, the return spring part 133 flexes, thereby generating a spring force that moves the movable iron plate 12 away from the fixed iron plate 11.

[0073] The movable iron plate 12 is mounted on the bracket 13. Therefore, the movable iron plate 12 is configured to rotate around the center point P1 and move toward the fixed iron plate 11 by the attraction generated when the current value of the electricity supplied from the external power source to the load becomes higher than a threshold.

[0074] The push-in part 14, in sync with the movement of the movable iron plate 12 toward the fixed iron plate 11, pushes the latching part 3 from the latched position to the non-latched position. More specifically, the push-in part 14 pushes upward the end 33 of the latching part 3 (see reference 11). Figure 1 This pushes the latching part 3 from the latched position to the non-latched position. According to this embodiment, the push-in part 14 is integrally formed with the bracket 13 and moves together with the bracket 13 while the movable iron plate 12 moves toward the fixed iron plate 11.

[0075] The push-in portion 14 is made of a material lighter than the material of the movable iron plate 12. In this embodiment, the push-in portion 14 is integrally formed with the support 13, therefore, both the support 13 and the push-in portion 14 are made of a material lighter than the material of the movable iron plate 12. As used herein, "a material lighter than the material of the movable iron plate 12" refers to a material including reinforcing fibers, such as polyamide (PA), polyamide-imide (PAI), polyimide (PI), PEEK, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene (PE), ABS, polystyrene (PS), polypropylene (PP), acrylic acid (PMNA), polyacetal (POM), liquid crystal polymer (LCP), or melamine (MF). This construction allows the movable iron plate 12 to move toward the fixed iron plate 11 at a higher speed, thus enabling the latching portion 3 to be pushed more forcefully from the latched position toward the non-latched position. In other words, this configuration allows the tripping device 1 to trip the movable contact 2B from the fixed contact 2A with a stronger force. Alternatively, this configuration further enhances the tripping force generated by the movement of the movable iron plate 12 toward the fixed iron plate 11.

[0076] like Figure 5 As shown, the push-in portion 14 according to this embodiment includes a connecting portion 141, a first portion 142, a mounting portion 143, a second portion 144, and a contact portion 145.

[0077] Each of the first part 142 and the second part 144 is a plate member in the shape of a rectangular flat plate. The thickness of the first part 142 is generally consistent in the front-to-back direction. The thickness of the second part 144 is generally consistent in the vertical direction. The first end (lower end) of the first part 142 is provided with a connecting part 141 that connects to the connecting part 132 of the bracket 13. Figure 5As shown, the connecting portion 132 of the bracket 13 and the connecting portion 141 of the push-in portion 14 are connected to each other via a swivel joint. The second end (upper end) of the first portion 142 is connected to the first end (front end) of the second portion 144. A mounting portion 143 is provided at the connecting portion between the second end (upper end) of the first portion 142 and the first end (front end) of the second portion 144. The mounting portion 143 is configured to mount the push-in portion 14 inside the main body 5, allowing the push-in portion 14 to rotate around the center point P2. According to this embodiment, the mounting portion 143 is rod-shaped and is fitted to a boss 59 (see reference 59) provided inside the main body 5. Figure 1 and Figure 2 In the second part 144, the contact portion 145 is provided at the second end (rear end).

[0078] When the push-in portion 14 is pushed into the latch portion 3, the contact portion 145 contacts the end 33 of the latch portion 3. According to this embodiment, the contact portion 145 is a rectangular flat plate member. The thickness of the contact portion 145 according to this embodiment is generally consistent with the front-rear direction. According to this embodiment, the contact portion 145 is configured to face the first portion 142. That is, when viewed in the left-right direction, the push-in portion 14 according to this embodiment is generally U-shaped. A locking portion 146 is provided at the end of the push-in portion 14 according to this embodiment. The locking portion 146 is located on the bimetallic plate 4... Figure 2 The end 42 (the upper end, to be described later) of the bimetallic plate 4 is locked in the deformed state shown. When viewed in the left-right direction, the locking part 146 according to this embodiment is semi-circular in shape.

[0079] The bimetallic plate 4 deforms under the heat generated by the circuit L1 (i.e., the fixed contact plate 81 in this embodiment). In other words, the bimetallic plate 4 is indirectly heated. Specifically, when an overcurrent flows through the circuit L1 due to an overload, for example, the temperature of the circuit L1 rises, thus causing the bimetallic plate 4 to deform due to the increased temperature of the circuit L1. The bimetallic plate 4 is a plate member with a rectangular flat plate shape. The thickness direction defined relative to the bimetallic plate 4 according to this embodiment is as follows... Figure 5 The left and right directions shown intersect (for example, at right angles in this embodiment).

[0080] like Figure 1 and 2 As shown, the bimetallic plate 4 has a connecting end 41 and an end 42. In the bimetallic plate 4 according to this embodiment, its lower end is the connecting end 41 and its upper end is the end 42. The connecting end 41 is connected to the circuit L1. More specifically, the connecting end 41 is connected to the fixed contact plate 81, which forms part of the circuit L1. The bimetallic plate 4 is fixed to the fixed contact plate 81 by connecting its connecting end 41 to the fixed contact plate 81. The bimetallic plate 4 protrudes from the connecting end 41 toward the engaging portion 146 of the push-in portion 14. Before the bimetallic plate 4 is deformed, asFigure 1 As shown, the end 42 of the bimetallic plate 4 contacts the engaging part 146.

[0081] When the heat generated by circuit L1 is transferred to bimetallic plate 4, bimetallic plate 4 deforms, causing its end 42 to bend (flex) and shift backward. This deformation of bimetallic plate 4 causes its end 42 to be engaged by engaging part 146, thus causing pushing part 14 to move and push latching part 3 from the latched position toward the non-latched position. The latching part 3, pushed into the non-latched position by pushing part 14, disconnects contact part 2. In other words, the deformation of bimetallic plate 4 under the heat generated by circuit L1 causes latching part 3 to disconnect contact part 2.

[0082] The bimetallic plate 4 is located between the movable iron plate 12 and the circuit L1. The circuit L1 is located between the bimetallic plate 4 and a portion of the fixed iron plate 11. More specifically, the circuit L1 is located between the bimetallic plate 4 and the first portion 111 of the fixed iron plate 11. That is, in the tripping device 1 according to this embodiment, the movable iron plate 12, the bimetallic plate 4, the circuit L1, and the fixed iron plate 11 are arranged sequentially from the front end to the rear end.

[0083] In other words, such as Figure 6 As shown, the bimetallic plate 4 and the circuit L1 are disposed between the fixed iron plate 11 and the movable iron plate 12. This configuration allows the heat generated by the circuit L1 (e.g., the fixed contact plate 81 in this embodiment) to be cut off by the fixed iron plate 11 and the movable iron plate 12. Therefore, the tripping device 1 according to this embodiment achieves the advantage of making it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate 4.

[0084] More specifically, the bimetallic plate 4 and the circuit L1 are arranged in the front-to-back direction between the first surface X1 of the fixed iron plate 11 and the second surface X2 of the movable iron plate 12. That is, the bimetallic plate 4 and the circuit L1 are arranged between the first surface X1 and the second surface X2 facing each other. This configuration allows the heat generated by the circuit L1 to be more easily cut off by the fixed iron plate 11 and the movable iron plate 12. Therefore, the tripping device 1 according to this embodiment achieves the advantage of making it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate 4.

[0085] The bimetallic plate 4 and the circuit L1 are configured parallel to the first surface X1 of the fixed iron plate 11. More specifically, the bimetallic plate 4 and the circuit L1 are configured parallel to the first surface X1 of the fixed iron plate 11 between the first surface X1 of the fixed iron plate 11 and the second surface X2 of the movable iron plate 12. That is, the portions of the bimetallic plate 4 and the circuit L1 located between the first surface X1 of the fixed iron plate 11 and the second surface X2 of the movable iron plate 12 are configured parallel to the first surface X1 of the fixed iron plate 11. In other words, the portions of the bimetallic plate 4 and the circuit L1 located between the first surface X1 of the fixed iron plate 11 and the second surface X2 of the movable iron plate 12 are parallel to each other and face each other along the thickness of the fixed iron plate 11. This configuration makes the spacing between the bimetallic plate 4 and the portions of the circuit L1 located between the first surface X1 of the fixed iron plate 11 and the second surface X2 of the movable iron plate 12 uniform, thus achieving the advantage that the heat generated by the circuit L1 can be more smoothly transferred to the bimetallic plate 4. As used in this article, if an object is “parallel” to another object, the two objects do not have to be perfectly parallel to each other, but can form a very small angle (e.g., ±2 degrees) as a tolerance between them.

[0086] In addition, such as Figure 6 As shown, the bimetallic plate 4 is positioned between the second portion 112 and the third portion 113 of the fixed iron plate 11 in the left-right direction. This configuration allows the heat generated by the circuit L1 to be further cut off by the second portion 112 and the third portion 113 of the fixed iron plate 11. Therefore, the tripping device 1 according to this embodiment achieves the advantage of making it even easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate 4.

[0087] like Figure 6 As shown, a first gap Y1 is left between the bimetallic plate 4 and the circuit L1. The first gap Y1 is the gap between the rear surface of the bimetallic plate 4 and the front surface of the circuit L1. More specifically, the first gap Y1 is the gap surrounded by the rear surface of the bimetallic plate 4, the left surface of the second part 112 of the fixing iron plate 11, the front surface of the circuit L1, and the right surface of the third part 113 of the fixing iron plate 11. This structure achieves the advantage that when the heat generated by the circuit L1 is transferred to the bimetallic plate 4, it makes the bimetallic plate 4 easier to deform, so that its end 42 bends (flexes) and shifts backward. That is, this structure achieves the advantage of making the bimetallic plate 4 deform more smoothly.

[0088] In this embodiment, such as Figure 1As shown, a first gap Y1 is left between the end 42 of the bimetallic plate 4 and the circuit L1. According to this embodiment, the circuit L1 is bent to connect to the connection end 41 of the bimetallic plate 4, and the first gap Y1 is left between the end 42 of the bimetallic plate 4 and the circuit L1 itself. This configuration achieves the advantage that when the heat generated by the circuit L1 is transferred to the bimetallic plate 4, the bimetallic plate 4 is more easily deformed, allowing its end 42 to bend (flex) around the connection end 41 and shift backward. In other words, this configuration achieves the advantage of allowing the bimetallic plate 4 to deform more smoothly.

[0089] In addition, such as Figure 6 As shown, circuit L1 is located between bimetallic plate 4 and fixed iron plate 11, and a second gap Y2 is left between circuit L1 and fixed iron plate 11. The second gap Y2 is a gap surrounded by the rear surface of circuit L1, the left surface of the second portion 112 of fixed iron plate 11, the front surface of the first portion 111 of fixed iron plate 11, and the right surface of the third portion 113 of fixed iron plate 11. This configuration achieves the advantage of allowing the heat generated by circuit L1 to be less easily transferred to fixed iron plate 11. In the circuit breaker according to the comparative example, the fixed iron plate is held in place by ribs provided on the inner surface of the body, thereby allowing the heat generated by the circuit to be transferred to the fixed iron plate, which may cause the temperature of the body (i.e., the temperature of the circuit breaker) to rise. In contrast, the circuit breaker 10 according to this embodiment makes it less easy for the heat generated by circuit L1 to be transferred to fixed iron plate 11, thus achieving the advantage of reducing the temperature rise of circuit breaker 10.

[0090] (3) Advantages

[0091] In the tripping device 1 according to this embodiment, the bimetallic plate 4 is positioned between a portion of the fixed iron plate 11 (i.e., the first portion 111) and the movable iron plate 12. This allows the heat generated by the circuit L1 to be cut off by the fixed iron plate 11 and the movable iron plate 12. Therefore, the tripping device 1 according to this embodiment achieves the advantage of making it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate 4. Thus, it achieves the advantage of allowing the bimetallic plate 4 to detect any abnormal electrical conditions more accurately.

[0092] Furthermore, placing the bimetallic plate 4 between the fixed iron plate 11 and the movable iron plate 12 causes a magnetic circuit to be formed through the bimetallic plate 4 and the fixed iron plate 11 when the current value of the electricity supplied from the external power source to the load becomes higher than a threshold, thus magnetizing the bimetallic plate 4. This generates an attractive force (magnetic force) that allows the bimetallic plate 4 to attract the movable iron plate 12. Therefore, this achieves the advantage of allowing the bimetallic plate 4 to attract the movable iron plate 12 with a stronger force when the current value of the electricity supplied from the external power source to the load becomes higher than a threshold.

[0093] In the tripping device 1 according to this embodiment, the fixed iron plate 11 has a first surface X1, and the movable iron plate 12 has a second surface X2 facing the first surface X1. The bimetallic plate 4 and the circuit L1 are disposed between the first surface X1 of the fixed iron plate 11 and the second surface X2 of the movable iron plate 12. This allows the heat generated by the circuit L1 to be more easily cut off by the fixed iron plate 11 and the movable iron plate 12. Therefore, the tripping device 1 according to this embodiment achieves the advantage of making it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate 4.

[0094] In the tripping device 1 according to this embodiment, the bimetallic plate 4 and the circuit L1 are configured parallel to the first surface X1 of the fixed iron plate 11. This makes the spacing between the bimetallic plate 4 and the portion of the circuit L1 located between the first surface X1 of the fixed iron plate 11 and the second surface X2 of the movable iron plate 12 uniform. This achieves the advantage of allowing the heat generated by the circuit L1 to be transferred more smoothly to the bimetallic plate 4.

[0095] In the tripping device 1 according to this embodiment, the fixing iron plate 11 includes a first portion 111, a second portion 112, and a third portion 113. The first portion 111 is a flat plate having a first surface X1, a first end 1111, and a second end 1112. The second portion 112 protrudes from the first end 1111 of the first portion 111 along the thickness of the first portion 111. The third portion 113 protrudes from the second end 1112 of the first portion 111 along the thickness of the first portion 111. A bimetallic plate 4 is located between the second portion 112 and the third portion 113 of the fixing iron plate 11. This allows the heat generated by the circuit L1 to be cut off even more smoothly by the second portion 112 and the third portion 113 of the fixing iron plate 11. Therefore, the tripping device 1 according to this embodiment achieves the advantage of making it even easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate 4.

[0096] In the tripping device 1 according to this embodiment, a first gap Y1 is left between the bimetallic plate 4 and the circuit L1. This achieves the advantage that when the heat generated by the circuit L1 is transferred to the bimetallic plate 4, the bimetallic plate 4 can be deformed more easily to bend its end 42 and shift backward. In other words, this structure achieves the advantage that the bimetallic plate 4 can be deformed more smoothly.

[0097] In the tripping device 1 according to this embodiment, the bimetallic plate 4 is a flat plate with a connecting end 41 and an end 42. The connecting end 41 is connected to the circuit L1, and a first gap Y1 is left between the end 42 of the bimetallic plate 4 and the circuit L1. This achieves the advantage that when the heat generated by the circuit L1 is transferred to the bimetallic plate 4, the bimetallic plate 4 can be deformed more easily so that its end 42 bends around the connecting end 41 and shifts backward. In other words, this achieves the advantage of making the bimetallic plate 4 deform more smoothly.

[0098] In the tripping device 1 according to this embodiment, the circuit L1 is located between the bimetallic plate 4 and a portion of the fixed iron plate 11 (i.e., the first portion 111), and a second gap Y2 is left between the circuit L1 and the fixed iron plate 11. This achieves the advantage of allowing the heat generated by the circuit L1 to be less easily transferred to the fixed iron plate 11.

[0099] (4) Variations

[0100] It should be noted that the above embodiments are merely exemplary embodiments among the various embodiments of this disclosure and should not be construed as limiting. Rather, the exemplary embodiments can be readily modified in various ways according to design choices or any other factors without departing from the scope of this disclosure. It should also be noted that the following variations can be appropriately combined.

[0101] In the above embodiment, the push-in portion 14 is made of a material lighter than that of the movable iron plate 12. Alternatively, the push-in portion 14 may also be made of a magnetic material. For example, the push-in portion 14 may be made of the same material as the movable iron plate 12, which is made of a magnetic material. It should be noted that if the push-in portion 14 is integrally formed with the support 13, then both the support 13 and the push-in portion 14 may be made of a magnetic material. Alternatively, the push-in portion 14 may also be made of a magnetic material that is lighter than that of the movable iron plate 12. This configuration achieves the advantage of reducing the magnetic resistance of the movable iron plate 12, thereby allowing the fixed iron plate 11 to attract the movable iron plate 12 with a stronger force.

[0102] In the above embodiment, both terminal portions 7 are bolt-type terminals. However, this is merely an example and should not be construed as limiting. Alternatively, at least one of the two terminal portions 7 may also be a terminal portion with a so-called "quick-connect structure," which allows connection without bolts.

[0103] (Summarize)

[0104] The tripping device (1) according to the first aspect is configured to disconnect the contacts (2) by moving the latching part (3) from the latching position to the non-latching position when an abnormal condition occurs in the electrical supply from an external power source to the load via the contact part (2). The tripping device (1) according to the first aspect includes a fixed iron plate (11), a movable iron plate (12), a push-in part (14), a circuit (L1), and an indirectly heated bimetallic plate (4). The movable iron plate (12) is configured to move toward the fixed iron plate (11) when an abnormal condition occurs. The push-in part (14) pushes the latching part (3) from the latching position to the non-latching position synchronously with the movement of the movable iron plate (12) toward the fixed iron plate (11). The circuit (L1) is located between a portion of the fixed iron plate (11) and the movable iron plate (12) to supply power. The bimetallic plate (4) is configured to shift the push-in portion (14) to a point that pushes the latch portion (3) from the latched position toward the non-latched position when deformed by the heat generated by the circuit (L1). The bimetallic plate (4) is located between the portion of the fixed iron plate (11) and the movable iron plate (12).

[0105] This aspect achieves the advantage of making it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate (4).

[0106] In the tripping device (1) according to the second aspect which can be implemented in conjunction with the first aspect, the fixed iron plate (11) has a first surface (X1). The movable iron plate 12 has a second surface (X2) facing the first surface (X1). The bimetallic plate (4) and the circuit (L1) are located between the first surface (X1) and the second surface (X2).

[0107] This aspect achieves the advantage of making it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate (4).

[0108] In the tripping device (1) according to the third aspect which can be implemented in conjunction with the second aspect, the bimetallic plate (4) and the circuit (L1) are configured to be parallel to the first surface (X1).

[0109] This aspect achieves the advantage of allowing the heat generated by the circuit (L1) to be transferred more smoothly to the bimetallic plate (4).

[0110] In the tripping device (1) according to a fourth aspect that can be implemented in conjunction with the second or third aspect, the fixing iron plate (11) includes a first part (111), a second part (112), and a third part (113). The first part (111) is a flat plate having a first surface (X1), a first end (1111), and a second end (1112). The second part (112) protrudes from the first end (1111) along the thickness of the first part (111). The third part (113) protrudes from the second end (1112) along the thickness. A bimetallic plate (4) is located between the second part (112) and the third part (113).

[0111] This aspect achieves the advantage of making it even easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate (4).

[0112] In the tripping device (1) according to the fifth aspect which can be implemented in combination with any of the first to fourth aspects, a gap (Y1) is left between the bimetallic plate (4) and the circuit (L1).

[0113] This aspect achieves the advantage of making the bimetallic plate (4) easier to deform.

[0114] In the tripping device (1) according to the sixth aspect which can be implemented in conjunction with the fifth aspect, the bimetallic plate (4) is a flat plate with a connecting end (41) and an end (42). The connecting end (41) is connected to the circuit (L1). A gap (Y1) is left between the end (42) and the circuit (L1).

[0115] This aspect achieves the advantage of making the bimetallic plate (4) even easier to deform.

[0116] In the tripping device (1) according to the seventh aspect which can be implemented in conjunction with any of the first to sixth aspects, the circuit (L1) is located between a portion of the bimetallic plate (4) and the fixed iron plate (11). A gap (Y2) is left between the circuit (L1) and the fixed iron plate (11).

[0117] This aspect achieves the advantage that the heat generated by the circuit (L1) is not easily transferred to the fixed iron plate (11).

[0118] The circuit breaker (10) according to the eighth aspect includes a tripping device (1) according to any one of the first to seventh aspects, a contact part (2), and a latching part (3). The contact part (2) is inserted into the circuit (L1). The latching part (3) disconnects the contact part (2) when the push-in part (14) is pushed from the latching position to the non-latching position.

[0119] This aspect achieves the advantage of providing a circuit breaker (10) that makes it easier to ensure that the temperature is high enough to trip the indirectly heated bimetallic plate (4).

[0120] The distribution board (100) according to the ninth aspect includes the circuit breaker (10) according to the eighth aspect and the cabinet (93), in which the circuit breaker (10) is housed.

[0121] This aspect achieves the advantage of providing a distribution board (100) that makes it easier to ensure that the temperature is high enough to trip the bimetallic plate (4) that is indirectly heated.

[0122] Explanation of reference numerals in the attached figures

[0123] 100 distribution board

[0124] 10 Circuit Breakers

[0125] 1. Trip device

[0126] 11 Fixed iron plate

[0127] 111 Part One

[0128] 1111 First End

[0129] 1112 Second End

[0130] 112 Part Two

[0131] 113 Part Three

[0132] 12 movable iron plates

[0133] 14. Push-in section

[0134] 2 contact section

[0135] 3 latches

[0136] 4 bimetallic plates

[0137] 41 Connection end

[0138] 42 end

[0139] 93 cabinets

[0140] L1 circuit

[0141] X1 First Surface

[0142] X2 Second Surface

[0143] Y1 First Gap (Gap)

[0144] Y2 Second Gap (Gap)

Claims

1. A tripping device configured to disconnect the contacts by shifting a latching portion from a latching position to a non-latching position when an abnormal condition occurs in the electrical supply from an external power source to a load via a contact portion, the tripping device comprising: Fixing the iron plate; A movable iron plate is configured to move toward the fixed iron plate when the abnormal condition occurs; The push-in portion is configured to push the latching portion from the latching position to the non-latching position in sync with the movement of the movable iron plate toward the fixed iron plate; A circuit, located between a portion of the fixed iron plate and the movable iron plate, is provided with power. as well as A bimetallic plate, configured to shift the push-in portion to a point where the latch portion is pushed from the latched position toward the non-latched position when deformed by the heat generated by the circuit, the bimetallic plate being of the indirect heating type and located between the portion of the fixed iron plate and the movable iron plate.

2. The tripping device according to claim 1, wherein, The fixing iron sheet has a first surface. The movable iron sheet has a second surface facing the first surface, and The bimetallic plate and the circuit are located between the first surface and the second surface.

3. The tripping device according to claim 2, wherein, The bimetallic plate and the circuit are configured to be parallel to the first surface.

4. The tripping device according to claim 2 or 3, wherein, The fixing iron sheet includes: The first part is in the shape of a flat plate, the flat plate having a first surface, a first end and a second end; The second part protrudes from the first end along the thickness of the first part; and The third part, which protrudes from the second end along the thickness, and The bimetallic plate is located between the second part and the third part.

5. The tripping device according to any one of claims 1 to 4, wherein, A gap is left between the bimetallic plate and the circuit.

6. The tripping device according to claim 5, wherein, The bimetallic plate is a flat plate with a connecting end and an end. The connection terminal is connected to the circuit, and The gap is left between the end and the circuit.

7. The tripping device according to any one of claims 1 to 6, wherein, The circuit is located between the bimetallic plate and the portion of the fixed iron plate, and A gap is left between the circuit and the fixed iron plate.

8. A circuit breaker, comprising: The tripping device according to any one of claims 1 to 7, The contact portion is inserted into the circuit; as well as The latch portion is configured to disconnect the contact portion when pushed from the latched position to the non-latched position by the push portion.

9. A power distribution board, comprising: The circuit breaker according to claim 8; as well as A cabinet, inside which the circuit breaker is housed.

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