Circuit breaker

Abstract

To provide a circuit breaker that can improve the responsiveness of the circuit breaker function against overcurrent.SOLUTION: A circuit breaker includes an opening / closing mechanism that opens and closes a conductive path by bringing a pair of contact portions into and out of contact with each other, an operating member that moves between an engagement position where the circuit breaker engages with the opening / closing mechanism to maintain the abutting state of the pair of contact portions with the opening / closing mechanism and a disengagement position where the engagement is released to release the maintenance, and a tripping mechanism that moves the operating member from the engagement position to the disengagement position to release the engagement between the operating member and the opening / closing mechanism, and the tripping mechanism includes an electromagnetic body that is electromagnetized by an overcurrent, and a movable body that moves between a separation position where there is a gap between the electromagnetic body and the operating member that is positioned at the engagement position, and an attraction position where the operating member is attracted by the electromagnetized the electromagnetic body and approaches the electromagnetic body and the operating member moves from the engagement position to the disengagement position, and a biasing member that biases the movable body to temporarily position the movable body in a position of abutting against the operating member that is positioned at the engagement position between the separation position and the attraction position.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a circuit breaker. [Background technology]

[0002] Conventionally, circuit breakers having multiple poles and multiple tripping elements have been provided; for example, Patent Document 1 discloses a 2P2E type circuit breaker having two poles and two tripping elements.

[0003] Such a circuit breaker includes a conductive path of one pole, a conductive path of the other pole, and a switching mechanism for opening and closing the conductive path of one pole and the conductive path of the other pole.

[0004] In the conduction path of one pole, the power supply terminal, contact part (fixed contact part and movable contact part that comes into and out of contact with the fixed contact part), tripping device, and load side terminal are connected in that order, and in the conduction path of the other pole, the power supply terminal, tripping device, contact part (fixed contact part and movable contact part that comes into and out of contact with the fixed contact part), and load side terminal are connected in that order.

[0005] One of the tripping devices is configured to act on the switching mechanism to open one contact part and the other contact part when an abnormal current (such as an overcurrent or short-circuit current) flows in the connected electrical circuit, and the other tripping device is also configured to act on the switching mechanism to open one contact part and the other contact part when an abnormal current flows in the connected electrical circuit.

[0006] Therefore, the circuit breaker is said to be able to open the contacts of both poles when an abnormal current flows in the electrical circuit connected to one pole or the electrical circuit connected to the other pole. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-56763 Summary of the Invention [Problem to be solved by the invention]

[0008] In the conventional circuit breakers described above, there are cases where it is required to shorten the time it takes for an abnormal current to flow through the electrical circuit until the electrical circuit is opened, and to improve the responsiveness of the circuit breaking function to an overcurrent.

[0009] In view of the above circumstances, an object of the present invention is to provide a circuit breaker that can improve the responsiveness of the breaking function to an overcurrent. [Means for solving the problem]

[0010] The circuit breaker of the present invention comprises: a pair of contact portions that, when in contact with each other, close a conductive path within the housing, and, when separated from each other, open the conductive path; an opening / closing mechanism that opens and closes the conductive path by bringing the pair of contact portions into and out of contact with each other; an actuating member configured to move between an engagement position where the actuating member engages with the opening and closing mechanism to maintain the pair of contact portions in contact with each other by the opening and closing mechanism, and a disengagement position where the actuating member disengages from the opening and closing mechanism to release the opening and closing mechanism from maintaining the pair of contact portions in contact with each other; a tripping mechanism configured to perform a tripping operation to release the engagement between the actuating member and the opening / closing mechanism by moving the actuating member from the engagement position to the disengagement position, The tripping mechanism includes: an electromagnetic body that is electromagnetized by receiving an overcurrent flowing through the conductive path; a movable body configured to be movable between a distanced position where the movable body is spaced from the electromagnetic body and the operating member disposed at the engagement position, and an attracted position where the movable body is attracted to the electromagnetized electromagnetic body, approaches the electromagnetic body, and abuts against the operating member, moving the operating member from the engagement position to the disengagement position; The movable body has a biasing member that biases the movable body so as to temporarily position the movable body at a position where it abuts against the operating member at the engagement position between the separated position and the attracting position.

[0011] In the circuit breaker of the above configuration, when an overcurrent flows in the conductive path, the movable body moves the operating member from the engaged position to the disengaged position as the movable body approaches the electromagnetic body, thereby starting the operation of opening the pair of contacts of the opening / closing mechanism.

[0012] In the circuit breaker, the biasing member biases the movable body to a position where it temporarily abuts against the operating member in the engagement position between the separated position and the attracted position, so that the movable body begins to move from a state in which it is abutting against the operating member, and can move the operating member from the engagement position to the disengagement position, thereby improving the responsiveness of the circuit breaker function to overcurrent.

[0013] In the circuit breaker of the present invention, The biasing member may bias the movable body so as to temporarily position the movable body at a position closer to the electromagnetic body than the separated position.

[0014] According to this configuration, the movable body is temporarily positioned closer to the electromagnetic body than the separated position, so that when the electromagnetic body is electromagnetized, the attractive force to the movable body increases, improving responsiveness. [Effects of the Invention]

[0015] As described above, the circuit breaker of the present invention can achieve the excellent effect of improving the responsiveness of the circuit breaker function to an overcurrent. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a circuit breaker according to a first embodiment of the present invention. [Figure 2] FIG. 2(a) is a view of the circuit breaker as seen from one of its outer surfaces, and FIG. 2(b) is a view of the circuit breaker as seen from the front side. [Figure 3] FIG. 3 is an exploded perspective view of the circuit breaker according to the embodiment. [Figure 4] FIG. 4 is a diagram showing the inside of the circuit breaker according to the embodiment with one exterior body removed. [Figure 5] FIG. 5 is an enlarged view of the circuit breaker according to the embodiment, showing the inside with one exterior body removed. [Figure 6] FIG. 6 is an explanatory diagram showing the inside of the circuit breaker according to the embodiment with the other exterior body removed. [Figure 7] FIG. 7 is an explanatory diagram of the state immediately after the conduction path of the circuit breaker according to the embodiment is interrupted, showing the inside with one exterior body removed. [Figure 8] FIG. 8 is an explanatory diagram of the state immediately after the conduction path of the circuit breaker according to the embodiment is interrupted, showing the inside with the other exterior body removed. [Figure 9] FIG. 9 is a perspective view of a circuit breaker according to a second embodiment of the present invention. [Figure 10] FIG. 10 is an exploded perspective view of the circuit breaker according to the same embodiment. [Figure 11] FIG. 11 is a top view of the inside of the circuit breaker according to the embodiment. [Figure 12] FIG. 12 is a partial cross-sectional view of the circuit breaker according to the same embodiment. [Figure 13] FIG. 13 is a partially enlarged view of FIG. [Figure 14] FIG. 14 is an explanatory diagram of the internal structure of the circuit breaker according to the embodiment. [Figure 15] FIG. 15 is an explanatory diagram of the state immediately after the conduction path of the circuit breaker according to the embodiment is interrupted, showing the inside with the exterior body removed. [Figure 16] FIG. 16 is an explanatory diagram of the state immediately after the conduction path of the circuit breaker according to the embodiment is interrupted, showing the inside with the exterior body removed. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, a circuit breaker according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

[0018] The circuit breaker of this embodiment is a thermal electromagnetic circuit breaker, and is a so-called 2P2E type circuit breaker, which has two circuits (pole) that can be opened and closed simultaneously and two tripping elements for switching the circuit from a closed state to an open state.

[0019] The circuit breaker 1 includes a housing 2 as shown in Figures 1, 2(a), and 2(b), a first conductive path 3 constituting one of two poles as shown in Figure 3, a second conductive path 4 constituting the other of the two poles, an opening / closing mechanism 5 for operating to open and close the first conductive path 3 and the second conductive path 4, an operating member 6 configured to move between an engagement position where it engages with the opening / closing mechanism 5 to maintain the state in which the first conductive path 3 and the second conductive path 4 are closed by the opening / closing mechanism 5, and a disengagement position where it disengages from the opening / closing mechanism 5 to release the state in which the first conductive path 3 and the second conductive path 4 are maintained closed by the opening / closing mechanism 5, and an interlocking member 7 that interlocks the operation of the second conductive path 4 with the operation of the operating member 6.

[0020] The housing 2 has a pair of exterior bodies 20 that are combined in a butted state, and an inner wall body 21 (see Figure 3) that is arranged between the pair of exterior bodies 20.

[0021] The pair of exterior bodies 20 have a back surface 200 (see Figure 2(a)) that is arranged facing the installation surface, a front surface 201 (see Figure 2(b)) that faces the opposite side from the back surface 200, an inner surface (not numbered) that forms the inner wall surface of the housing 2, and an outer surface 202 that forms the outer wall surface of the housing 2.

[0022] In the description of the circuit breaker 1 of this embodiment, the direction in which the pair of exterior bodies 20 are combined (butted together) is referred to as the width direction, the direction in which the rear surface 200 and the front surface 201 of the exterior bodies 20 are aligned is referred to as the height direction, and the direction perpendicular to the width direction and the height direction is referred to as the orthogonal direction. In addition, the direction from the rear surface 200 toward the front surface 201 of the housing 2 in the height direction is referred to as the upward direction, and the direction from the front surface 201 toward the rear surface 200 of the housing 2 in the height direction is referred to as the downward direction.

[0023] Furthermore, the direction in which the operating member 6 moves from the engaged position toward the disengaged position is referred to as the disengagement direction, and the direction in which the operating member 6 moves from the disengaged position toward the engaged position is referred to as the anti-disengagement direction.

[0024] The terms "upper" and "lower" are used for convenience, and the circuit breaker 1 may be installed with the front surface 201 facing horizontally.

[0025] In the following description, the components included in the first conductive path 3 will be referred to as "first."

[0026] As shown in Figure 4, the first conductive path 3 has a first terminal portion 30 to which an external electrical path is electrically connected, a first opening / closing portion 31 that is electrically connected to the first terminal portion 30 and is configured to open and close, and a first tripping mechanism 32 that performs a tripping operation to release the engagement between the operating member 6 and the opening / closing mechanism 5 by moving the operating member 6 from an engaged position to a disengaged position.

[0027] The first terminal portion 30 has a first one terminal portion 300 and a first other terminal portion 301 that respectively constitute separate end portions of the first conductive path 3 .

[0028] The first one terminal portion 300 is disposed on one side of the housing 2 in the orthogonal direction.

[0029] The first other terminal portion 301 is disposed on the other side of the housing 2 in the orthogonal direction.

[0030] The first opening / closing portion 31 has a first contact portion electrically connected to the first one terminal portion 300 and a first contact portion electrically connected to the first other terminal portion 301 .

[0031] The first contact portion electrically connected to the first other terminal portion 301 is fixed within the housing 2 so that its position does not change, and is hereinafter referred to as the first fixed contact portion 310.

[0032] The first contact portion electrically connected to the first one terminal portion 300 is arranged within the housing 2 in a state in which it can be brought into contact with and separated from the first fixed contact portion 310, and will hereinafter be referred to as the first movable contact portion 311.

[0033] The first fixed contact portion 310 has a first fixed conductive plate 3100 formed using a long, thin metal plate, and a first fixed contact 3101 attached to the first fixed conductive plate 3100.

[0034] The first fixed conductive plate 3100 has a tip end to which the first fixed contact 3101 is attached, and a base end that is fixed to the housing 2.

[0035] Since the first fixed conductive plate 3100 is fixed so that its position within the housing 2 does not change, the position of the first fixed contact 3101 also does not change.

[0036] The first movable contact portion 311 has a first movable conductive plate 3110 made of a long, thin metal plate and configured to move within the housing 2, and a first movable contact 3111 attached to the first movable conductive plate 3110.

[0037] The first movable conductive plate 3110 has a tip end to which the first movable contact 3111 is attached, and a base end that is held by a first holding portion 500 of the opening / closing mechanism 5, which will be described later.

[0038] Furthermore, the tip end of the first movable conductive plate 3110 is disposed at a position shifted downward from the tip end of the first fixed conductive plate 3100. The tip end of the first movable conductive plate 3110 and the tip end of the first fixed conductive plate 3100 face each other in the height direction.

[0039] Accordingly, first movable contact 3111 is disposed at a position shifted downward from first fixed contact 3101. First movable contact 3111 and first fixed contact 3101 face each other in the height direction.

[0040] Therefore, the first opening / closing part 31 is configured so that when the tip of the first movable conductive plate 3110 moves downward in the height direction, the first movable contact 3111 moves away from the first fixed contact 3101, and when the tip of the first movable conductive plate 3110 moves upward in the height direction, the first movable contact 3111 abuts against the first fixed contact 3101.

[0041] In the first opening / closing section 31, when the first fixed contact 3101 and the first movable contact 3111 are separated from each other, the first conductive path 3 is in an open state, and when the first fixed contact 3101 and the first movable contact 3111 are in contact with each other, the first conductive path 3 is in a closed state.

[0042] The tip of the first movable conductive plate 3110 is in the shape of a long, thin plate and is configured to be elastic in the thickness direction, and the tip is configured to bend and generate an elastic force when the first fixed contact 3101 and the first movable contact 3111 are in contact with each other.

[0043] As shown in Figure 5, the first tripping mechanism 32 has a first bimetal 320 electrically connected to the first one-side terminal portion 300 and the first movable contact portion 311, a first electromagnetic body 321 that is electromagnetized in response to current flowing through the first conductive path 3, a first movable body 322 that is configured to be movable between a separated position where it is spaced apart from the first electromagnetic body 321 and the operating member 6 that is positioned in the engaged position, and an attracted position where it is attracted by the electromagnetized first electromagnetic body 321, approaches the electromagnetic body 321, and abuts against the operating member 6, moving the operating member 6 from the engaged position to the disengaged position, and a first biasing member 323 that biases the first movable body 322 to a position (hereinafter referred to as the temporary position) between the separated position and the attracted position where it abuts against the operating member 6 that is positioned in the engaged position.

[0044] The first bimetal 320 is electrically connected to the first one terminal portion and the first movable contact portion by a conductive member such as a lead wire or a bus bar. The first bimetal 320 is fixed to a first base portion B1 that is fixed inside the housing 2.

[0045] When the current flowing through the first conductive path 3 exceeds a predetermined value, the first bimetal 320 bends so that the other end side in the longitudinal direction moves in a direction perpendicular to the longitudinal direction (the thickness direction of the first bimetal 320, the release direction).

[0046] The first electromagnetic body 321 is formed in a U-shape, and therefore has a pair of side walls that face each other with a gap between them in the width direction, and a connecting wall that connects to each end of the pair of side walls (a base end that is one end in the perpendicular direction).

[0047] First electromagnetic body 321 is disposed at a position shifted outward in the orthogonal direction from first movable body 322, and the tip end portions (end portions opposite the base end portions) of the pair of side walls are disposed facing first movable body 322 in the orthogonal direction. Therefore, first electromagnetic body 321 is disposed so as to open toward first movable body 322.

[0048] The temporary position of the first movable body 322 is the position where the first movable body 322 is disposed when the first conductive path 3 is in the closed state.

[0049] In addition, the separated position of the first movable body 322 refers to a position to which the first movable body 322 can move when its movement is not restricted by the first biasing member 323 (when the first biasing member 323 is not attached).

[0050] Therefore, although the original movable range of first movable body 322 is from the separated position to the attracted position, the original movable range of first movable body 322 is limited to the range from the temporary placement position to the attracted position by first biasing member 323. Therefore, first movable body 322 is allowed to move within a range in which it can maintain contact with actuating member 6.

[0051] The first movable body 322 of this embodiment has a first base 3220 that is connected to the operating member 6 in a state where it can rotate around an axis extending in the width direction, and a first movable main body 3221 that extends upward from the first base 3220 and whose tip is configured to move to one side and the other side in the circumferential direction centered on the first base 3220.

[0052] Therefore, the separated position, the suction position, and the temporary placement position of the first movable body 322 are the placement positions of the first movable main body part 3221.

[0053] The first base portion 3220 is formed in the shape of a shaft extending along the width direction. Therefore, the first movable body 322 is rotatable in the circumferential direction around the first base portion 3220. The first base portion 3220 is rotatably held by a movable holding portion 66 of the actuating member 6, which will be described later.

[0054] The first movable main body part 3221 is plate-shaped, and one plate surface of the first movable main body part 3221 faces the first electromagnetic body 321 (the pair of side walls) in the orthogonal direction.

[0055] Furthermore, the first movable main body part 3221 is configured to abut against the lower end part (lower end part of the side wall) of the first electromagnetic body 321 in the height direction whether it is positioned in the separated position, the temporary position, or the suction position.

[0056] The first biasing member 323 is configured by a tension spring. One end of the first biasing member 323 in the expansion / contraction direction is hooked to a hook portion 22 formed on the inner wall body 21, and the other end of the first biasing member 323 in the expansion / contraction direction is hooked to the tip portion of the first movable main body portion 3221.

[0057] The direction of extension and contraction of first biasing member 323 is set to match the direction in which first movable body 322 approaches and moves away from first electromagnetic body 321. When first movable body 322 is arranged in the separated position, it is configured to receive a biasing force from first biasing member 323 that moves in a direction toward first electromagnetic body 321.

[0058] In the following description, the components included in the second conductive path 4 will be referred to as "second."

[0059] As shown in Figure 6, the second conductive path 4 has a second terminal portion 40 to which an external electrical path is electrically connected, a second opening / closing portion 41 that is electrically connected to the second terminal portion 40 and is configured to open and close, and a second tripping mechanism 42 that performs a tripping operation to release the engagement between the operating member 6 and the opening / closing mechanism 5 by moving the operating member 6 from an engaged position to a disengaged position via the interlocking member 7.

[0060] The second terminal portion 40 has a second one terminal portion 400 and a second other terminal portion 401 that respectively constitute separate end portions of the second conductive path 4 .

[0061] The second one terminal portion 400 is disposed on the other side of the housing 2 in the orthogonal direction.

[0062] The second other terminal portion 401 is disposed on one side of the housing 2 in the orthogonal direction.

[0063] The second opening / closing portion 41 has a second contact portion electrically connected to the second one terminal portion 400 and a second contact portion electrically connected to the second other terminal portion 401 .

[0064] The second contact portion electrically connected to the second other terminal portion 401 is fixed within the housing 2 so that its position does not change, and is hereinafter referred to as the second fixed contact portion 410.

[0065] The second contact portion electrically connected to the second one-side terminal portion 400 is arranged within the housing 2 in a state in which it can be brought into contact with and separated from the second fixed contact portion 410, and will hereinafter be referred to as the second movable contact portion 411.

[0066] The second fixed contact portion 410 has a second fixed conductive plate 4100 formed using a long, thin metal plate, and a second fixed contact 4101 attached to the second fixed conductive plate 4100.

[0067] The second fixed conductive plate 4100 has a tip end to which the second fixed contact 4101 is fixed, and a base end that is held by the housing 2.

[0068] The second fixed contact 4101 is configured so that the second fixed conductive plate 4100 is fixed so that its position in the housing 2 does not change, and so the position of the second fixed contact 4101 also does not change.

[0069] The second movable contact portion 411 has a second movable conductive plate 4110 configured to move within the housing 2, and a second movable contact 4111 attached to the second movable conductive plate 4110.

[0070] The second movable conductive plate 4110 has a tip end to which the second movable contact 4111 is fixed, and a base end held by a second holding portion 501 of the opening / closing mechanism 5, which will be described later.

[0071] The tip end of the second movable conductive plate 4110 is disposed at a position shifted upward from the tip end of the second fixed conductive plate 4100. The tip end of the second movable conductive plate 4110 and the tip end of the second fixed conductive plate 4100 face each other in the height direction.

[0072] Accordingly, the second movable contact 4111 is disposed at a position shifted upward from the second fixed contact 4101. The second movable contact 4111 and the second fixed contact 4101 face each other in the height direction.

[0073] Therefore, the second opening / closing part 41 is configured so that when the tip of the second movable conductive plate 4110 moves upward in the height direction, the second movable contact 4111 moves away from the second fixed contact 4101, and when the tip of the second movable conductive plate 4110 moves downward in the height direction, the second movable contact 4111 abuts against the second fixed contact 4101.

[0074] In the second opening / closing section 41, when the second fixed contact 4101 and the second movable contact 4111 are separated from each other, the second conductive path 4 is in an open state, and when the second fixed contact 4101 and the second movable contact 4111 are in contact with each other, the second conductive path 4 is in a closed state.

[0075] The second tripping mechanism 42 includes a second bimetal 420 electrically connected to the second one-side terminal portion 400 and the second movable contact portion 411, a second electromagnetic body 421 that is electromagnetized in response to current flowing through the second conductive path 4, a second movable body 422 that is configured to be movable between a separated position where it is spaced apart from the second electromagnetic body 421 and the interlocking member 7 that is positioned in its initial position, and an attracted position where it is attracted by the electromagnetized second electromagnetic body 421, approaches the electromagnetic body 421, and abuts against the interlocking member 7, moving the interlocking member 7 from its initial position to its advanced position, and a second biasing member 423 that biases the second movable body 422 to a position (hereinafter referred to as the temporary position) between the separated position and the attracted position where it abuts against the interlocking member 7 that is positioned in its initial position.

[0076] The second bimetal 420 is electrically connected to the second one terminal portion 400 and the second movable contact portion 411 by a conductive member such as a lead wire or a bus bar. The second bimetal 420 is fixed to the second base portion B2 which is fixed inside the housing 2.

[0077] Furthermore, when the current flowing through the second conductive path 4 exceeds a predetermined value, the second bimetal 420 bends so as to move in the same direction as the direction in which the operating member 6 moves when moving from the engaged position to the disengaged position.

[0078] The second electromagnetic body 421 is formed in a U-shape, and therefore has a pair of side walls that face each other with a gap between them in the width direction, and a connecting wall that connects to each end of the pair of side walls (a base end that is one end in the perpendicular direction).

[0079] Second electromagnetic body 421 is disposed at a position shifted outward in the orthogonal direction from second movable body 422, and the tip end portions (end portions opposite the base end portions) of the pair of side walls are disposed facing second movable body 422 in the orthogonal direction. Therefore, second electromagnetic body 421 is disposed so as to open toward second rotating body 422.

[0080] The temporary position of the second movable body 422 is the position where the second movable body 422 is disposed when the second conductive path 4 is in the closed state.

[0081] In addition, the separated position of the second movable body 422 refers to a position to which the second movable body 422 can move when the movement of the second movable body 422 is not restricted by the second biasing member 423 (when the second biasing member 423 is not attached).

[0082] Therefore, although the original movable range of the second movable body 422 is from the separated position to the suction position, the original movable range of the second movable body 422 is limited by the second biasing member 423 to the range from the temporary placement position to the suction position, and movement is permitted within a range in which the abutment state with the interlocking member 7 can be maintained.

[0083] The second movable body 422 of this embodiment has a second base 4220 that is connected to the housing 2 in a state where it can rotate around an axis extending in the width direction, and a second movable main body 4221 that extends upward from the second base 4220 and whose tip is configured to move to one side and the other side in the circumferential direction centered on the second base 4220.

[0084] The second base portion 4220 is formed in the shape of a shaft extending along the width direction. Therefore, the second movable body 422 is rotatable in the circumferential direction around the second base portion 4220. The second base portion 4220 is rotatably held by a housing bearing portion 23 formed on the inner wall body 21.

[0085] The second movable main body part 4221 is plate-shaped, and one plate surface of the second movable main body part 4221 faces the second electromagnetic body 421 (the pair of side walls) in the orthogonal direction.

[0086] A gap is formed between the second movable main body part 4221 and the second movable body 422 (side wall), and this gap narrows when the second movable main body part 4221 is positioned in the suction position, and widens when the second movable main body part 4221 is positioned in the separated position.

[0087] The direction in which the second biasing member 423 biases the second movable main body part 4221 is set in accordance with the direction in which the second movable main body part 4221 approaches the second electromagnetic body 421.

[0088] As shown in Figure 4, the opening / closing mechanism 5 is an opening / closing rotor 50 that can rotate around an axis extending along the width direction, and has an opening / closing rotor 50 that switches the open / closed state of the first conductive path 3 and the second conductive path 4 in accordance with the rotational movement, a pressing member 51 that applies an external force to the opening / closing rotor 50 to rotate the opening / closing rotor 50 in one direction in the circumferential direction, and a pressing operation unit 52 for operating the pressing member 51.

[0089] The opening / closing rotor 50 has a first holding portion 500 that holds the base end of the first movable conductive plate 3110, a second holding portion 501 (see Figure 6) that holds the base end of the second movable conductive plate 4110, and a rotating held portion 502 that is provided on the first holding portion 500 and the second holding portion 501 and is held in a state that allows it to rotate circumferentially around an axis extending along the width direction.

[0090] In the opening / closing mechanism 5 of this embodiment, the rotating held part 502 is configured as a shaft part extending along the width direction. Therefore, the first holding part 500 and the second holding part 501 are rotatable in the circumferential direction around the rotating held part 502, and are configured to rotate together in the same direction.

[0091] As the first holding portion 500 rotates to one side in the circumferential direction around the rotating held portion 502, it moves the first movable conductive plate 3110 in a direction approaching the first fixed conductive plate 3100, causing the first movable contact 3111 to abut against the first fixed contact 3110 (i.e., switching the first conductive path 3 to a closed state).

[0092] In addition, as the first holding portion 500 rotates to the other side in the circumferential direction around the rotating held portion 502, it moves the first movable conductive plate 3110 in a direction away from the first fixed conductive plate 3100, and moves the first movable contact 3111 away from the first fixed contact 3110 (i.e., switches the first conductive path 3 to an open state).

[0093] As shown in Figure 6, the second holding portion 501 rotates to one side in the circumferential direction around the rotating held portion 502, moving the second movable conductive plate 4110 in a direction approaching the second fixed conductive plate 4100, and bringing the second movable contact 4111 into contact with the second fixed contact 4110 (i.e., switching the second conductive path 4 to a closed state).

[0094] In addition, as the second holding portion 501 rotates to the other side in the circumferential direction around the rotating held portion 502, it moves the second movable conductive plate 4110 in a direction separating it from the second fixed conductive plate 4100, separating the second movable contact 4111 from the second fixed contact 4110 (i.e., switching the second conductive path 4 to an open state).

[0095] As shown in Figure 4, the pressing member 51 has a pressing connection part 510 that is connected to the opening / closing rotor 50 and the pressing operation part 52 and is movable in both directions in the height direction, and a pressing plate 511 that extends from the pressing connection part 510 toward the operating member 6 and is engageable with the operating member 6 from one side in the height direction and also from the other side.

[0096] The holding connection portion 510 has an opening / closing link 5100 connected to the opening / closing rotor 50, an operation link 5101 connected to the holding operation portion 52, and a link connection portion 5102 connecting the opening / closing link 5100 and the operation link 5100.

[0097] The tip of the opening / closing link 5100 is connected to a portion of the opening / closing rotor 50 that is shifted to one side from the rotationally held portion 502 in the orthogonal direction.

[0098] The base end of the opening / closing link 5100 is connected to one side of the link connecting portion 5102 in the orthogonal direction.

[0099] The tip of the operating link 5101 is connected to the pressing operating part 52 .

[0100] The base end of the operating link 5101 is connected to the other side of the link connecting portion 5102 in the orthogonal direction.

[0101] Therefore, the base end of the operating link 5101 is connected to the link connecting portion 5102 at a position shifted to the other side in the orthogonal direction from the base end of the opening / closing link 5100.

[0102] The pressing plate 511 extends from the link connecting portion 5102 toward the operating member 6 in the perpendicular direction.

[0103] The upper plate surface of the pressing plate 511 that is disposed facing upward is a surface that can be engaged with the operating member 6 from the downward side.

[0104] When the opening / closing mechanism 5 switches the first conductive path 3 and the second conductive path 4 to the closed state, the upper surface of the pressing plate 511 engages with the operating member 6. In addition, the pressing plate 511 is biased upward from the opening / closing rotor 50 via the opening / closing link 5100 and the link connecting portion 5102, and this maintains the engagement between the pressing plate 511 and the operating member 6.

[0105] The pressing operation unit 52 is configured by a handle configured to be rotatable relative to the housing 2. The pressing operation unit 52 is configured to press down the operation link 5101 downward when rotated to one side in the circumferential direction starting from the rotation center.

[0106] Furthermore, when the holding operation part 52 is rotated to one side in the circumferential direction starting from the center of rotation, if the holding plate 511 and the operating member 6 are engaged, the state in which the holding operation part 52 is rotated to one side in the circumferential direction starting from the center of rotation is also maintained.

[0107] As shown in Figure 5, the actuating member 6 has an actuating rotating part 60 that serves as the center of rotation in the circumferential direction around an axis extending along the width direction, and is rotatably mounted inside the housing 2, an actuating engaging part 61 that extends upward from the actuating rotating part 60 and is engageable with the pressure plate 511 in the height direction, an actuating side movable body receiving part 62 that is pushed in the release direction, an actuating side bimetal receiving part 63 that is pushed from the engagement position in the release direction by the first bimetal 320, an interlocking receiving part 64 that is pushed from the engagement position to the disengagement position by the interlocking member 7, an engagement biasing member 65 (see Figure 5) that biases in the anti-release direction, and a movable holding part 66 that rotatably holds the first base part 3220 of the first movable body 322.

[0108] The operational engagement portion 61 has an engagement surface 610 formed to face downward. The upper plate surface of the pressing plate 511 engages with the engagement surface 610 from below.

[0109] When the first movable body 322 arranged in the temporary arrangement position abuts the operating engagement portion 61, the operating engagement portion 61 receives a biasing force from the first movable body 322 in the release direction, but is in a state in which it does not move in the release direction.

[0110] The biasing force of the engagement biasing member 65 is transmitted to the first movable body 322 as an external force in the direction opposite to the release direction. Therefore, the biasing force of the engagement biasing member 65 is greater than that of the first biasing member 323 within the range in which the first movable body 322 can move from the temporary arrangement position to the suction position.

[0111] When the first movable body 322 moves from the temporary arrangement position to the suction position, the operational engagement portion 61 is pushed in the release direction by the first movable body 322, and moves from the engagement position to the disengagement position.

[0112] The actuation side movable body receiving portion 62 is disposed forward of the first movable main body portion 3221 in the release direction, and is in contact with the first movable main body portion 3221.

[0113] The operating side bimetal receiving portion 63 is disposed forward of the first bimetal 320 in the release direction, and is in contact with the first bimetal 320.

[0114] The interlocking receiving portion 64 is disposed forward of an interlocking release operating portion 70 of the interlocking member 7 (described later) in the release direction, and is in contact with the first bimetal 320.

[0115] As described above, the engagement biasing member 65 biases the operational engagement portion 61 in the direction opposite to the release direction.

[0116] The movable holding portion 66 is formed so as to partially surround the periphery of the first base portion 3220.

[0117] As shown in Figure 6, the interlocking member 7 has an interlock release operating part 70 that pushes the interlocking receiving part 64 in the release direction, an interlocking side movable body receiving part 71 that is pushed in the release direction by the second movable body 422, and an interlocking side bimetal receiving part 72 that is pushed in the release direction by the second bimetal 420.

[0118] The interlock release operation portion 70 is always in contact with the interlock receiving portion 64, and the second movable body 422 is always in contact with the interlock side movable body receiving portion 71.

[0119] The interlocking side bimetal receiving portion 72 is not in contact with the second bimetal 420 when the second bimetal 420 is not bent, and comes into contact with the second bimetal 420 when the second bimetal 420 is bent.

[0120] The configuration of the circuit breaker 1 of this embodiment is as described above. Next, the operation of the circuit breaker 1 will be described.

[0121] When the first conductive path 3 and the second conductive path 4 are in a closed state and no overcurrent is flowing through either the first conductive path 3 or the second conductive path 4, as shown in Figure 4, the operating member 6 is placed in the engagement position and the pressing plate 511 of the opening / closing mechanism 5 is engaged with the operating engagement portion 61 of the operating member 6.

[0122] Moreover, the first movable body 322 is disposed at the temporary disposition position, and is spaced apart from the first electromagnetic body 321.

[0123] Furthermore, the first movable body 322 presses the actuation-side movable body receiving portion 62 in the release direction to such an extent that the actuation member 6 does not move toward the disengagement position.

[0124] When an overcurrent flows through the first conductive path 3 and the first movable body 322 is attracted to the first electromagnetic body 321, as the first movable body 322 moves from the temporary placement position to the attraction position, the actuating side movable body receiving portion 62 is pushed in the release direction to move the actuating member 6 to the disengagement position.

[0125] When the operating member 6 moves to the disengagement position, the presser plate 511 is disengaged from the operating engagement portion 61, and the opening / closing mechanism 5 opens the first conductive path 3 and the second conductive path 4 (see FIGS. 7 and 8).

[0126] In this way, the first conductive path 3 and the second conductive path 4 are opened.

[0127] As described above, in the circuit breaker 1 of this embodiment, when an overcurrent flows in the first conductive path 3, as the first movable body 322 approaches the first electromagnetic body 321, the first movable body 32 moves the operating member 6 from the engaged position to the disengaged position, thereby starting the operation of the opening / closing mechanism 5 to open the first conductive path 3 and the second conductive path 4.

[0128] The first biasing member 323 biases the first movable body 322 to a position where it temporarily abuts the operating member 323 in the engagement position between the separated position and the attracted position, so that the first movable body 322 starts to move from a state where it is abutting the operating member 6, and moves the operating member 6 from the engagement position to the disengagement position, thereby improving the responsiveness of the circuit-breaking function to overcurrent.

[0129] Therefore, the circuit breaker 1 of this embodiment can achieve the excellent effect of improving the responsiveness of the breaking function to an overcurrent.

[0130] Furthermore, in the circuit breaker 1 of this embodiment, the first biasing member 323 is configured to bias the first movable body 322 so that it is temporarily positioned at a position closer to the first electromagnetic body 321 than the separated position. Therefore, the first movable body 322 is temporarily positioned at a position closer to the first electromagnetic body 321 than the separated position, and when the first electromagnetic body 321 is electromagnetized, the attractive force on the first movable body 322 increases, improving responsiveness.

[0131] Next, a circuit breaker according to a second embodiment of the present invention will be described with reference to the accompanying drawings. Note that the names and symbols of the components are different from those used in the description of the circuit breaker of the first embodiment.

[0132] The circuit breaker of this embodiment is a fully electromagnetic type circuit breaker.

[0133] The circuit breaker 1 includes a housing 2 as shown in Figures 9 and 10, a conductive path 3 as shown in Figure 12, an opening / closing mechanism 4 for opening and closing the conductive path 3, and an operating member 5 configured to move between an engagement position where the operating member engages with the opening / closing mechanism 4 to maintain the conductive path 3 in a closed state by the opening / closing mechanism 4, and a disengagement position where the operating member disengages from the opening / closing mechanism 4 to release the opening / closing mechanism 4 from maintaining the conductive path 3 in a closed state.

[0134] As shown in Figure 10, the housing 2 has a storage section 20 that stores the conductive path 3, the opening / closing mechanism 4, and the operating member 5 inside, and a lid section 21 that is arranged above the conductive path 3, the opening / closing mechanism 4, and the operating member 5.

[0135] In the description of the circuit breaker 1 of this embodiment, the direction in which the accommodating section 20 and the cover section 21 overlap is referred to as the height direction. In addition, the direction from the accommodating section 20 to the cover section 21 in the height direction is referred to as the upward direction, and the direction from the cover section 21 to the accommodating section 20 in the height direction is referred to as the downward direction.

[0136] Furthermore, the circuit breaker 1 of this embodiment has three conductive paths 3, and the direction in which these three conductive paths 3 are arranged is referred to as the width direction, and the direction perpendicular to the height direction and width direction is referred to as the orthogonal direction (see Figure 11).

[0137] Furthermore, the direction in which the operating member 5 moves from the engaged position toward the disengaged position is referred to as the disengagement direction, and the direction in which the operating member 5 moves from the disengaged position toward the engaged position is referred to as the anti-disengagement direction.

[0138] The terms "upper" and "lower" are used for convenience, and the circuit breaker 1 may be installed with the housing and cover facing sideways.

[0139] As shown in Figure 12, the conductive path 3 has a terminal portion 30 to which an external electrical path is electrically connected, an opening / closing portion 31 that is electrically connected to the terminal portion 30 and is configured to open and close, and a tripping mechanism 32 that performs a tripping operation to release the engagement between the operating member 5 and the opening / closing mechanism 4 by moving the operating member 5 from an engaged position to a disengaged position.

[0140] The terminal portion 30 has one terminal portion 300 and another terminal portion 301 that respectively constitute separate end portions of the conductive path 3 .

[0141] One terminal portion 300 is arranged on one side of the housing 2 in the orthogonal direction.

[0142] The other terminal portion 301 is disposed on the other side of the housing 2 in the orthogonal direction.

[0143] The opening / closing unit 31 has a contact point electrically connected to the one terminal unit 300 and a contact point electrically connected to the other terminal unit 301 .

[0144] The contact portion electrically connected to the other terminal portion 301 is fixed in the housing 2 so that its position does not change, and is hereinafter referred to as a fixed contact portion 310.

[0145] On the other hand, the contact portion electrically connected to the terminal portion 300 is disposed in the housing 2 in a state in which it can be brought into contact with and separated from the fixed contact portion 310, and is hereinafter referred to as the movable contact portion 311.

[0146] The fixed contact portion 310 has a fixed conductive plate 3100 formed using a thin metal plate, and a fixed contact 3101 attached to the fixed conductive plate 3100 .

[0147] The fixed conductive plate 3100 has a tip end to which the fixed contact 3101 is attached, and a base end that is fixed to the housing 2.

[0148] The fixed conductive plate 3100 is fixed so that its position does not change within the housing 2, and therefore the fixed contact 3101 also does not change its position.

[0149] The movable contact portion 311 has a movable conductive plate 3110 which is made of a long, thin metal plate and which is configured to move within the housing 2 , and a movable contact 3111 which is attached to the movable conductive plate 3110 .

[0150] The movable conductive plate 3110 has a tip end to which the movable contact 3111 is attached, and a base end opposite the tip end.

[0151] Furthermore, the tip of the movable conductive plate 3110 is disposed at a position shifted upward from the tip of the fixed conductive plate 3100. The tip of the movable conductive plate 3110 and the tip of the fixed conductive plate 3100 face each other in the height direction.

[0152] Accordingly, the movable contact 3111 is disposed at a position shifted upward from the fixed contact 3101. The movable contact 3111 and the fixed contact 3101 face each other in the height direction.

[0153] Therefore, the opening / closing section 31 is configured so that when the tip of the movable conductive plate 3110 moves upward in the height direction, the movable contact 3111 moves away from the fixed contact 3101, and when the tip of the movable conductive plate 3110 moves downward in the height direction, the movable contact 3111 abuts against the fixed contact 3101.

[0154] In the opening / closing section 31, when the fixed contact 3101 and the movable contact 3111 are separated from each other, the conductive path 3 is in an open state, and when the fixed contact 3101 and the movable contact 3111 are in contact with each other, the conductive path 3 is in a closed state.

[0155] The tripping mechanism 32 includes an operating base part 320 erected within the storage part 20, an electromagnetic body 321 which becomes electromagnetized in response to a current flowing through the conductive path 3, a movable body 322 which is configured to be movable between a separated position where there is a gap between the electromagnetic body 321 and the operating member 5 which is positioned at the engagement position, and an attracted position where it is attracted by the electromagnetized electromagnetic body 321 and approaches the electromagnetic body 321 while abutting against the operating member 5, moving the operating member 5 from the engagement position to the disengaged position, a biasing member 323 which biases the movable body 322 to a position (hereinafter referred to as the temporary position) between the separated position and the attracted position where it abuts against the operating member 5 which is positioned at the engagement position, and a coil 324 which is positioned around the electromagnetic body 321.

[0156] The operating base portion 320 has a base portion 3200 fixed inside the housing 2 and a standing portion 3201 standing upright from the base portion 3200.

[0157] The electromagnetic body 321 is formed in a shaft shape and is erected in the housing 2 with the axis direction aligned with the height direction.

[0158] The electromagnetic body 321 is made of metal and is inserted inside the main body of the coil 324 .

[0159] Here, the coil 324 has a coil main body 3240 formed in a spiral shape, a first connection portion 3241 extending from one end of the coil main body 3240 and electrically connected to one terminal portion 300, and a second connection portion 3242 extending from the other end of the coil main body 3240 and electrically connected to the movable contact portion 311.

[0160] The electromagnetic body 321 is configured to generate a magnetic force in response to a current flowing through the coil 324 .

[0161] The temporary placement position of the movable body 322 is the position where the movable body 322 is placed when the conductive path 3 is in the closed state.

[0162] In addition, the separated position of the movable body 322 refers to a position to which the movable body 322 can move when the movement of the movable body 322 is not restricted by the biasing member 323 (when the biasing member 323 is not attached).

[0163] Therefore, although the original movable range of the movable body 322 is from the separated position to the attracted position, the original movable range of the movable body 322 is limited to the range from the temporary placement position to the attracted position by the biasing member 323. Therefore, the movable body 322 is allowed to move within a range in which it can maintain a state of contact with the actuating member 5.

[0164] The movable body 322 in this embodiment has a base 3220 supported at the tip of the standing portion 3201 in a state where it can rotate around an axis extending in the width direction, a first extension portion 3221 extending from the base 3220 towards the electromagnetic body 321 and facing the upper end surface of the electromagnetic body 321 in the height direction, and a second extension portion 3222 extending from the base 3220 to the opposite side of the electromagnetic body 321 and arranged in contact with the biasing member 323 and the operating member 5.

[0165] When the movable body 322 rotates to one side in the circumferential direction around the base portion 3220, the gap between the first extending portion 3221 and the electromagnetic body 321 narrows, and the second extending portion 3222 pushes the operating member 5 in the release direction.

[0166] Furthermore, when the movable body 322 rotates to the other side in the circumferential direction around the base portion 3220, the gap between the first extending portion 3221 and the electromagnetic body 321 widens, and the second extending portion 3222 moves in the direction opposite to the release direction.

[0167] The biasing member 323 is made of a plate spring. One end of the biasing member 323 in the longitudinal direction is fixed to the standing portion 3201 (one surface of the standing portion 3201 that is arranged toward the operating member 5), and the other end of the biasing member 323 in the longitudinal direction is raised from the standing portion 3201 toward the operating member 5.

[0168] Additionally, second extending portion 3222 abuts against the other end side of biasing member 323. Therefore, when second extending portion 3222 is pushed toward biasing member 323, biasing member 323 is configured to push back second extending portion 3222 in the release direction.

[0169] As shown in Figure 13, the opening / closing mechanism 4 is movable up and down in the height direction and has a crossbar 40 that switches the open / closed state of the conductive path 3 as it moves up and down, an opening / closing biasing member 41 that biases the crossbar 40 upward, a pressing member 42 that presses the crossbar 40 downward, a pressing operation unit 43 for operating the pressing member 42, an opening / closing engagement unit 44 that can restrict the movement of the operating member 5 by engaging with the operating member 5, and an opening / closing guide unit 45 that guides the movement of the pressing member 42.

[0170] The crossbar 40 has an insertion area formed therein through which the movable conductive plate 3110 can be inserted in the orthogonal direction, and the movable conductive plate 3110 is fixed in a state in which it is inserted into this insertion area. Therefore, the crossbar 40 is configured to move the movable conductive plate 3110 upward as it moves upward. As a result, the movable contact 3111 moves away from the fixed contact 3101, and the conductive path 3 switches to an open state.

[0171] Additionally, the crossbar 40 is configured to move the movable conductive plate 3110 downward as it moves downward, causing the movable contact 3111 to come into contact with the fixed contact 3101, switching the conductive path 3 to the closed state.

[0172] The opening / closing biasing member 41 is configured to bias the movable conductive plate 3110 upward, thereby biasing the cross bar 40 upward as well.

[0173] Therefore, the crossbar 40 is configured to move downward together with the movable contact portion 311 when pressed downward, and to move upward together with the movable contact portion 311 when the pressing operation is released.

[0174] The pressing member 42 is rotatably connected to the crossbar 40 and the pressing operation portion 43 .

[0175] The pressing operation part 43 has an operation shaft 430 extending along the width direction, and an operation part main body 431 configured to be rotatable in the circumferential direction around the operation shaft 430.

[0176] The pressing member 42 is rotatably connected to an operating portion main body 431 of the pressing operating portion 43.

[0177] The operating unit main body 431 is configured to move the holding member 42 downward when rotated toward one side in the circumferential direction centered on the operating shaft 430, and to move the holding member 42 upward when rotated toward the other side in the circumferential direction centered on the operating shaft 430.

[0178] As the pressing member 42 moves up and down, the crossbar 40 and the movable contact portion 311 also move up and down.

[0179] The opening / closing engagement portion 44 has a rotation mounting portion 440 that is rotatably mounted on the operating shaft 430, and an extension engagement portion 441 that extends from the rotation mounting portion 440 and engages with the operating member 5.

[0180] The extending engagement portion 441 extends downward from the rotation mounting portion 440, and is configured so that its tip portion engages with (butts against) the operating member 5 from the upper side in the height direction.

[0181] The opening / closing guide portion 45 is fixed inside the housing 2, and has a guide groove 450 formed therein to guide the movement of the connecting portion of the pressing member 42 with the operation portion main body 431.

[0182] The actuating member 5 has an actuating rotating part 50 which is the center of rotation in the circumferential direction around an axis extending along the width direction and which is rotatably mounted inside the housing 2, an actuating abutment part 51 which extends upward from the actuating rotating part 50 and abuts against the movable body 322 in the perpendicular direction, an actuating engagement part 52 which extends from the actuating rotating part 50 towards the opening / closing mechanism 4 and with which the extending engagement part 441 engages from the upward side, and an actuating biasing member 53 (see Figure 14) which applies a biasing force acting on one side in the circumferential direction around the actuating rotating part 50 to the actuating abutment part 51 and the actuating engagement part 52.

[0183] The actuating member 5 is configured to move (rotate) from the disengaged position to the engaged position by rotating in one direction in the circumferential direction around the actuating rotating part 50, and to move from the engaged position to the disengaged position by rotating in the other direction in the circumferential direction around the actuating rotating part 50.

[0184] The biasing force of the actuation biasing member 53 is transmitted to the movable body 322 as an external force in the direction opposite to the release direction. Therefore, the biasing force of the actuation biasing member 53 is greater than that of the biasing member 323 within the range in which the movable body 322 can move from the temporary arrangement position to the suction position.

[0185] The configuration of the circuit breaker 1 according to this embodiment is as described above. Next, the operation of the circuit breaker 1 will be described.

[0186] When the conductive path 3 is in a closed state and no overcurrent is flowing through the conductive path 3, the operating member 5 is positioned in the engaged position, as shown in Figure 15, and the extended engaging portion 441 of the opening / closing mechanism 4 is engaged with the operating abutment portion 51 of the operating member 5.

[0187] Moreover, the movable body 322 is placed at the temporary placement position, and is spaced apart from the electromagnetic body 321 .

[0188] Furthermore, the movable body 322 presses the actuation contact portion 51 in the release direction to such an extent that the actuation member 5 does not move toward the disengagement position.

[0189] When an overcurrent flows through the conductive path 3 and the movable body 322 is attracted to the electromagnetic body 321, the movable body 322 moves from the temporary placement position to the attraction position, and the actuating abutment portion 51 is pushed in the release direction to move the actuating member 5 to the disengagement position.

[0190] When the operating member 5 moves to the disengagement position, the extension engagement portion 441 is disengaged from the operating engagement portion 52, and the opening / closing mechanism 4 opens the conductive path 3 (see FIG. 16).

[0191] In this way, the conductive path 3 is opened.

[0192] As described above, in the circuit breaker 1 according to this embodiment, when an overcurrent flows in the conductive path 3, as the movable body 322 approaches the electromagnetic body 321, the movable body 322 moves the operating member 5 from the engaged position to the disengaged position, thereby starting the operation of the opening and closing mechanism 4 to open the conductive path 3.

[0193] The biasing member 323 biases the movable body 322 to a position where it temporarily abuts against the operating member 5 in the engagement position between the separated position and the attracted position, so that the movable body 322 starts to move from a state where it is abutting against the operating member 5, and can move the operating member 5 from the engagement position to the disengagement position, thereby improving the responsiveness of the circuit-breaking function to overcurrent.

[0194] Therefore, the circuit breaker 1 of this embodiment can also achieve the excellent effect of improving the responsiveness of the breaking function to an overcurrent.

[0195] Furthermore, in the circuit breaker 1 of this embodiment, the first biasing member 323 is configured to bias the first movable body 322 so that it is temporarily positioned at a position closer to the first electromagnetic body 321 than the separated position. Therefore, the first movable body 322 is temporarily positioned at a position closer to the first electromagnetic body 321 than the separated position, and when the first electromagnetic body 321 is electromagnetized, the attractive force on the first movable body 322 increases, improving responsiveness.

[0196] The circuit breaker 1 according to the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0197] In the circuit breaker 1 of the first embodiment described above, the first base portion 3220 of the first movable body 322 forms the rotation shaft, and the movable holder 66 of the actuating member 6 forms the bearing, but this configuration is not limiting. For example, the actuating member 6 may be configured to have a rotation shaft instead of the movable holder 66, and the first movable body 322 may be configured to have a bearing instead of the first base portion 3220.

[0198] In the circuit breaker 1 of the first embodiment described above, the second base portion 4220 of the second movable body 422 forms the rotation axis, and the housing bearing portion 23 of the inner wall body 21 forms the bearing, but this configuration is not limiting. For example, the inner wall body 21 may be configured to have a rotation axis instead of the housing bearing portion 23, and the second movable body 422 may be configured to have a bearing instead of the second base portion 4220.

[0199] The first base portion 3220 in the first embodiment described above is formed to extend outward in the width direction more than the first movable main body portion 3221, and its tip portion is rotatably held by the outer body 20, but this configuration is not limited to this as long as it is attached in a state where it can rotate relative to the outer body 20.

[0200] Although not specifically mentioned in the description of the circuit breaker 1 of the first embodiment above, the first bimetal 320 and the second bimetal 420 perform so-called time-delay tripping, and the first electromagnetic body 321 and the second electromagnetic body 421 perform so-called instantaneous tripping. [Explanation of symbols]

[0201] (First embodiment) 1...circuit breaker, 2...casing, 3...first conductive path, 4...second conductive path, 5...opening / closing mechanism, 6...operating member, 7...interlocking member, 20...exterior body, 21...inner wall body, 22...latching portion, 23...casing bearing portion, 30...first terminal portion, 31...first opening / closing portion, 32...first tripping mechanism, 40...second terminal portion, 41...second opening / closing portion, 42...second tripping mechanism, 50...opening / closing rotor, 51...member, 52...operating portion, 60...operating rotor portion, 61...operating engagement portion, 62...operating side movable body receiving portion, 63... Operating side bimetal receiving portion, 64...interlocking receiving portion, 65...engagement biasing member, 66...movable holding portion, 70...interlock release operating portion, 71...interlocking side movable body receiving portion, 72...interlocking side bimetal receiving portion, 200...rear surface, 201...front surface, 202...outer surface, 300...first one terminal portion, 301...first other terminal portion, 310...first fixed contact portion, 311...first movable contact portion, 320...first bimetal, 321...first electromagnetic body, 321...electromagnetic body, 322...first movable body, 323...first attachment Forcing member, 400...second one terminal portion, 401...second other terminal portion, 410...second fixed contact portion, 411...second movable contact portion, 420...second bimetal, 421...second electromagnetic body, 422...second movable body, 422...second rotating body, 423...second forcing member, 500...first holding portion, 501...second holding portion, 502...rotating held portion, 510...connecting portion, 511...pressing plate, 610...engaging surface, 3100...first fixed conductive plate, 3101...first fixed contact, 3110...second 1 Movable conductive plate, 3110...first fixed contact, 3111...first movable contact, 3220...first base, 3221...first movable main body, 4100...second fixed conductive plate, 4101...second fixed contact, 4110...second movable conductive plate, 4110...second fixed contact, 4111...second movable contact, 4220...second base, 4221...second movable main body, 5100...opening / closing link, 5101...operation link, 5102...link connecting portion, B1...first base, B2...second base Second Embodiment 1...circuit breaker, 2...casing, 3...conductive path, 4...opening / closing mechanism, 5...operating member, 20...accommodating section, 21...lid section, 30...terminal section, 31...opening / closing section, 32...tripping mechanism, 32...operating mechanism, 40...crossbar, 41...opening / closing biasing member, 42...holding member, 43...operating section, 44...opening / closing engaging section, 45...opening / closing guide section, 50...operating rotation section, 51...operating abutment section, 52...operating engaging section, 53...operating biasing member, 62...operating side movable body receiving section, 300...one terminal section, 301...other terminal section, 310...fixed contact section, 311...movable contact section, 3 20...operation base portion, 321...electromagnetic body, 322...movable body, 323...biasing member, 324...coil, 430...operation shaft, 431...operation portion main body, 440...rotation mounting portion, 441...extension engagement portion, 450...guide groove, 3100...fixed conductive plate, 3101...fixed contact, 3110...movable conductive plate, 3111...movable contact, 3200...base portion, 3200...standing portion, 3201...standing portion, 3220...base portion, 3221...first extension portion, 3222...second extension portion, 3240...coil main body portion, 3241...first connection portion, 3242...second connection portion

Claims

1. a pair of contact portions that, when in contact with each other, close a conductive path within the housing, and, when separated from each other, open the conductive path; an opening / closing mechanism that opens and closes the conductive path by bringing the pair of contact portions into and out of contact with each other; an actuating member configured to move between an engagement position where the actuating member engages with the opening and closing mechanism to maintain the pair of contact portions in contact with each other by the opening and closing mechanism, and a disengagement position where the actuating member disengages from the opening and closing mechanism to release the opening and closing mechanism from maintaining the pair of contact portions in contact with each other; a tripping mechanism configured to perform a tripping operation to release the engagement between the actuating member and the opening / closing mechanism by moving the actuating member from the engagement position to the disengagement position, The tripping mechanism includes: an electromagnetic body that is electromagnetized by receiving an overcurrent flowing through the conductive path; a movable body configured to be movable between a spaced position at which there is a gap between the electromagnetic body and the operating member disposed at the engagement position, and an attracted position at which the movable body is attracted to the electromagnetized electromagnetic body, approaches the electromagnetic body, and abuts against the operating member to move the operating member from the engagement position to the disengagement position, a biasing member that biases the movable body to a position between the separated position and the suction position where the movable body abuts against the operating member that is positioned at the engagement position, Circuit breaker.

2. the biasing member biases the movable body so as to temporarily position the movable body at a position closer to the electromagnetic body than the separated position; 10. The circuit breaker of claim 1.

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