JP2010140818A - Circuit breaker unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker unit in which a switching mechanism portion is downsized. <P>SOLUTION: The circuit breaker unit operates a switching mechanism by having a tripping device operate a trip bar when an overload current flows, and by releasing engagement of a hook and a latch which are energizing supported by a latch spring to which the trip bar is fixed and supported to the mechanism frame. The latch spring is inserted and supported in a hole portion with an inner diameter slightly larger than the outer peripheral diameter of the coil portion of the latch spring installed in the mechanism frame, and the both legs of the latch spring are in contact with the hook and the latch on both sides interposing the mechanism frame and energize these. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a circuit breaker, and more particularly to a structure of an opening / closing mechanism portion thereof.

  In a conventional circuit breaker, for example, as disclosed in Patent Document 1, a latch spring held by a mechanism frame of an opening / closing mechanism is configured by a torsion coil spring, and an inner diameter portion of the latch spring The space is penetrated by a shaft pin fixedly held by a pair of mechanism frames or a bent portion of the mechanism frame, and one of the two legs of the latch spring abuts on the pivotally supported latch and the other leg The portion abuts against the bent portion of the frame, thereby urging the aforementioned latch in a predetermined direction.

In the conventional circuit breaker configured in this way, when an overload current of a predetermined value or more flows for a predetermined time or more, the bimetal part constituting the time trip device is bent by a predetermined amount or more and presses the trip bar. This causes the trip bar to rotate. By turning the trip bar, the latch that is in contact with the trip bar is operated to disengage the latch and the latch, and the opening / closing mechanism is tripped to drive the movable contact, The movable contact fixed to the movable contact deviates from the fixed contact and interrupts the circuit. In addition, when an excessive current such as a short circuit current flows, the electromagnet device constituting the instantaneous trip device operates to rotate the trip bar, thereby engaging the latch and the latch in the same manner as described above. And the opening / closing mechanism trips to drive the movable contact, thereby instantaneously interrupting the circuit.
Japanese Patent Laying-Open No. 2001-35196 (FIG. 13)

  In the case of the conventional circuit breaker configured as described above, an opening / closing mechanism constituting member such as a handle arm or a main spring that operates when the movable contactor is driven to open / close the circuit, a bimetal portion, a plunger In order to prevent the tripping device constituent member such as the shaft from interfering with the latch spring holding member such as the shaft pin holding the latch spring or the bent portion of the mechanism frame, the aforementioned opening / closing mechanism constituent member and tripping device constituent member Therefore, it is necessary to arrange the latch spring holding member so that the latch spring holding member is not arranged on the movement trajectory, and this causes a problem that the circuit breaker is downsized.

  The present invention has been made to solve the above-mentioned problems in the conventional circuit breaker, and an object thereof is to obtain a circuit breaker that can be easily miniaturized.

  A circuit breaker according to the present invention comprises a movable contact that is opposed to a fixed contact, and is driven to move the movable contact away from or contact the fixed contact to interrupt or close an electric circuit; A tripping device that operates when a current greater than or equal to a predetermined value flows in the electrical circuit; a trip bar that is rotatably provided and is driven based on the operation of the tripping device and rotates in a predetermined direction; The trip bar is provided so as to be engageable via a latch and is always urged to rotate in a predetermined direction by a latch spring. When engaged, the rotation is prevented, and the trip bar is A latch that is disengaged when rotated and rotates in the predetermined direction, and is provided to be engageable with the latch, and is disengaged from the latch when the latch rotates in the predetermined direction. And a circuit breaker having an opening / closing mechanism that shuts or closes the electric circuit by driving the movable contact, wherein the latch springs are provided at both ends of the coil and the coil, respectively. A pair of legs, and the coil part is held in the mechanism frame by being inserted into a hole provided in a mechanism frame holding the opening / closing mechanism part, and the pair of legs of the latch spring Are arranged separately on both sides of the mechanism frame across the mechanism frame, and one of the pair of feet contacts the latch to urge the latch and the other A foot part abuts on the latch and biases the latch.

  The circuit breaker according to the present invention comprises a movable contact facing the fixed contact, and is driven to move or move the movable contact away from or to contact the fixed contact, thereby closing or closing the electric circuit. A tripping device that operates when a current greater than or equal to a predetermined value flows through the electric circuit, and a trip bar that is pivotally provided and is driven based on the operation of the tripping device and rotates in a predetermined direction. The trip bar is provided so as to be engageable via a latch, and is always urged to rotate in a predetermined direction by a latch spring, and when engaged, the rotation is prevented, and the trip bar A latch that is disengaged when it rotates and rotates in the predetermined direction, a latch spring that constantly biases the latch, and a latch that is engageable with the latch. A circuit breaker having an opening / closing mechanism that disengages the latch and drives the movable contact to shut off or close the electric circuit when rotated in a direction. A coil portion and a pair of legs provided at both ends of the coil portion, and the coil portion is inserted into a first hole portion provided in a mechanism frame that holds the opening / closing mechanism portion. Is held by the mechanism frame, and one of the pair of legs is in contact with the latch to urge the latch, and the latch spring is provided at each of the coil portion and both ends of the coil portion. A pair of feet, and the coil portion is held in the mechanism frame by being inserted into a second hole provided in a mechanism frame that holds the opening / closing mechanism, and of the pair of feet One of them touches the latch It is characterized in that biases the latch Te.

  According to the circuit breaker of the present invention, the latch spring includes a coil portion and a pair of feet provided at both ends of the coil portion, and the coil portion is provided in a mechanism frame that holds the opening / closing mechanism portion. The pair of legs of the latch spring are separately disposed on both sides of the mechanism frame with the mechanism frame interposed therebetween, and are inserted into the holes formed in the holes. Since one of the legs is in contact with the latch and biases the latch, and the other leg is in contact with the latch and biases the latch, the latch spring The space occupied by the mechanism frame is only the thickness of the mechanism frame and one foot of the latch spring, and the operating locus of the handle arm and main spring of the opening / closing mechanism section or the bimetal section of the tripping device Operating locus of the plunger portion and the like of the electromagnetic device, or can be arranged a latch spring in the vertical side portion with respect to the trajectory of both, it can be made compact in the opening and closing mechanism portion and thus the circuit breaker.

  According to the circuit breaker according to the present invention, the latch spring includes a coil portion and a pair of feet provided at both ends of the coil portion, and the coil portion holds the opening / closing mechanism portion. Is inserted into a first hole provided in the mechanism frame, and is held by the mechanism frame, and one of the pair of feet abuts the latch to urge the latch, and the latch spring is a coil And a pair of feet provided at both ends of the coil part, and the coil part is inserted into a second hole provided in a mechanism frame that holds the opening / closing mechanism part. Since the mechanism frame is configured such that one of the pair of feet abuts the latch and biases the latch, the space occupied by the latch spring and the latch spring between the mechanism frames is Mechanism frame It is only one foot of the plate thickness and latch spring, the operation trajectory of the handle arm of the opening / closing mechanism part, the main spring, etc., the operation trajectory of the bimetal part of the tripping device, the plunger part of the electromagnetic device, or both The latch spring and the latch spring can be arranged on the side in the vertical direction with respect to the trajectory, so that the opening / closing mechanism and the circuit breaker can be miniaturized.

  The objects, features, and effects of the present invention will become more apparent from the detailed description of the following embodiments and the drawings.

Embodiment 1 FIG.
Hereinafter, a circuit breaker according to Embodiment 1 of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol shows the same or equivalent part. FIG. 1 is a perspective view showing an external appearance of a three-phase circuit breaker (hereinafter simply referred to as a circuit breaker) according to Embodiment 1 of the present invention, and FIG. 2 is an open / close state with the cover part removed. It is a perspective view which shows a mechanism part, the trip apparatus, and a base housing | casing.

  1 and 2, the circuit breaker 100 includes an opening / closing mechanism 200, a tripping device 300, an opening / closing contact (not shown), and an arc extinguishing device (not shown). The arc extinguishing device is housed in a base housing 1 composed of a base 101 and a middle base 102 formed of an insulating material, and the switching mechanism 200, the tripping device 300, and the switching contact are fixed to the middle base 102. Is held. A cover 111 made of an insulating material is detachably attached to the base housing 1.

  FIG. 3 is a perspective view showing the switching mechanism 200 and the tripping device 300 when the circuit breaker 100 is in an on state, and FIG. 4 is a perspective view showing the switching mechanism 200 and the tripping device 300 when the circuit breaker 100 is tripped. FIG. 3 and 4, when a load current that is a three-phase electric circuit to which the circuit breaker 100 is connected, a load current of a predetermined value or more, that is, an overload current flows for a predetermined time or more, it is pulled. The bimetal portion 2 that constitutes the time tripping means in the tripping device 300 is bent by a predetermined amount to the right in the drawing to operate the trip bar 3 of the opening / closing mechanism portion 200, and as will be described later, the trip bar 3 The switching mechanism 200 is tripped by rotating the latch 4 that is in contact with each other, and three fixed switching contacts connected to the R, S, and T phase conductors (not shown) of the load circuit are fixed. The three movable contacts 6 that have been in contact with the contact 5 are separated.

  When a short-circuit current flows, a large magnetic force is generated in the electromagnetic coil portion 7 of the electromagnet device constituting the instantaneous tripping means in the tripping device 300, and the plunger portion 8 moves to the right side of the figure. As will be described later, the plunger portion 8 rotates the latch 4 to trip the opening / closing mechanism portion 200 to separate the fixed contact 5 and the movable contact 6 of the opening / closing contact portion.

  Next, the configuration of the opening / closing mechanism 200 will be described. FIG. 5 is a perspective view showing the switching mechanism 200 when the circuit breaker 100 is in an on state, FIG. 6 is a side sectional view of the switching mechanism 200 when the circuit breaker 100 is in an on state, and FIG. FIG. 8 is a perspective view of the switching mechanism 200 when the circuit breaker 100 is in an off state, FIG. 8 is a side sectional view of the switching mechanism 200 when the circuit breaker 100 is in an off state, and FIG. FIG. 10 is a side sectional view of the opening / closing mechanism unit 200 in the trip state of the circuit breaker 100. FIG.

  5 to 10, a pair of mechanism frames 14 arranged to face each other with a gap therebetween are fixed to the base casing 1 described above. The cross bar 20 is rotatably supported by the pair of mechanism frames 14 and rotatably holds three movable contacts 21 each having the movable contact 6 fixed thereto. Each movable contact 21 is always urged clockwise by a contact pressure spring 22, thereby bringing the movable contact 6 into contact with the fixed contact 5 with a predetermined contact pressure.

The handle arm 12 is rotatably supported on the mechanism frame 14 by a pin 121, and a handle 24 that is manually operated by an operator is fixed. As shown well in FIGS. 5, 7, and 9, when the bent portion 123 of the handle arm 12 abuts on the bent portion 141 of the mechanism frame 14, the handle 24 and the handle arm 12 are rotated in the clockwise direction. Is blocked.

  One end of the first link 9 and one end of the second link 10 are rotatably connected by a connect pin 13, and the other end of the second link 10 is rotated to the crossbar 20 by a pin 23. It is connected freely. The first link 9 includes an arcuate concave surface portion 91 at the other end. The main spring 11 composed of a tension spring has one end fixed to the above-described connect pin 13 and the other end fixed to the spring hook 122 of the handle arm 12 so that the connect pin 13 is always in the left direction in the figure. Is energized.

  The lever 19 includes an engaging portion 192 that can be engaged with one end portion of a latch 16 described later at one end portion thereof, and an arcuate convex surface portion 193 at the other end portion. The first link 9 is urged to the left in the figure by the main spring 11 via the connect pin 13, and the concave surface portion 91 of the first link 9 firmly contacts the convex surface portion 193 of the lever 19, thereby The first link 9 and the lever 19 are connected. The concave surface portion 91 of the first link 9 and the convex surface portion 193 of the lever 19 are slidably in contact with each other.

  The latch 16 is rotatably supported by the mechanism frame 14 by a pin 161 and includes a first engagement portion 162 that can engage with the engagement portion 192 of the lever 19 at one end, and a first latch 4 that will be described later. A second engaging portion 163 that can engage with the engaging portion 41 is provided at the other end portion. The trip bar 3 is rotatably supported by the pair of mechanism frames 14 and includes an engaging portion 31 that can engage with a second engaging portion 42 of the latch 4 described later. As shown in FIGS. 2, 3, and 4, the trip bar 3 is provided opposite to the tip of the bimetal portion 2 in the tripping device 300, and as described above, the trip bar 3 is connected to the three-phase electric circuit. When a current of a predetermined value or more flows for a predetermined time or longer, it is pressed by the bimetal portion 2 bent by a predetermined amount and is rotated clockwise.

  As shown well in FIGS. 5, 7, and 8, the latch 4 is rotatably supported by the pair of mechanism frames 14, and engages with the second engaging portion 163 of the latch 16 described above. A first engaging part 41 to be obtained, and a second engaging part 42 to be able to engage with the engaging part 31 of the trip bar 3 described above. Further, the latch 4 can be engaged with a spring receiving portion 43 arranged on the outer side of one mechanism frame 14 and a plunger portion 8 of an electromagnet device constituting an instantaneous tripping means in the above-described tripping device 300. A third engagement portion 44.

  Next, the latch spring 15 and its holding will be described. FIG. 11 is a perspective view showing a part of the mechanism frame 14 that holds the opening / closing mechanism 200 of the circuit breaker 100. FIG. 12 shows the mechanism frame 14, the latch spring 15, and the latch 4 when the circuit breaker 100 is on. FIG. 13 is a side sectional view showing the mechanism frame 14, the latch spring 15, the latch 4, and the latch 16 in the ON state of the circuit breaker 100, and FIG. 14 is an X direction of FIG. 6. FIG. 15 shows the mechanism frame 14, the latch spring 15, the latch 4, and the latch 16 in the trip state of the circuit breaker 100. FIG. 16 is a side sectional view showing the mechanism frame 14, the latch spring 15, the latch 4, and the latch 16 in the trip state of the circuit breaker 100.

  As shown in FIGS. 11 to 16, the mechanism frame 14 that holds the opening / closing mechanism 200 includes a through hole 142 that forms a hole. The latch spring 15 includes a coil portion 151 and a pair of feet 152 and 153 connected to both ends of the coil portion 151, and the coil portion 151 passes through the through hole 142 of the mechanism frame 14, and the pair of feet The parts 152 and 153 are arranged so as to be separately located on both sides of the mechanism frame 14. The aforementioned through hole 142 of the mechanism frame 14 is formed so that the inner diameter thereof is slightly larger than the outer diameter of the coil portion 151 of the latch spring 15, and the latch spring 15 inserted into this through hole 142 has its coil. The outermost peripheral portion of the portion 151 is held by the mechanism frame 14 by contacting the inner peripheral surface of the through hole 142 of the mechanism frame 14.

  The latch spring 15 inserted and held in the through hole 142 of the mechanism frame 14 is engaged in a direction in which one foot 152 is engaged with the spring receiving portion 43 of the latch 4 to rotate the latch 4 in the clockwise direction. The other leg portion 153 engages with a spring receiving portion 164 provided at the other end portion of the latch 16 and urges the latch 16 to rotate counterclockwise.

  Next, the operation of the circuit breaker configured as described above according to the first embodiment of the present invention will be described. When the circuit breaker 100 is in the ON state, as shown in FIGS. 3, 5, and 6, the handle 24 has the bent portion 123 of the handle arm 12 in contact with or near the bent portion 141 of the mechanism frame 14. Located in the stop. At this time, the latch 4 that is constantly urged clockwise by the latch spring 15 is in a stationary state at the illustrated position, and the second engagement portion 42 of the latch 4 is in contact with the engagement portion 31 of the trip bar 3. Engagement prevents the trip bar 3 from rotating clockwise, and the first engagement portion 41 of the latch 4 engages the second engagement portion 163 of the latch 16 to cause the latch 16 to rotate clockwise. Rotation is prevented.

  The other end portion of the main spring 11 fixed to the tip end portion of the handle arm 12 is in the position shown in FIGS. 3, 5, and 6, and the main spring 11 is connected via the connection pin 13 by its pulling force. The first link 9 is urged in the left direction in the figure. As a result, the convex surface portion 193 of the lever 19 is urged to the left in the drawing via the concave surface portion 91 of the first link 9, and the lever 19 rotates in the clockwise direction around the pin 191. The engaging portion 192 provided at one end portion of the lever 19 is engaged with the first engaging portion 162 provided at one end portion of the latch 16. Rotation in the direction is prevented by the latch 16.

  In this state, the second link 10 connected to the first link 9 by the connecting pin 13 is in the position shown in FIGS. 3, 5, and 6, and the movable contact 21 via the pin 23. The movable contact 6 fixed to the movable contact 21 is in contact with the fixed contact 5 by the contact pressure of the contact pressure spring 22 and closes the load circuit.

  Next, when the circuit breaker 100 shown in FIGS. 3, 5, and 6 is in an ON state, a trip operation when a load current of a predetermined value or more flows in the load circuit for a predetermined time or more, that is, time-delay means The tripping operation of the circuit breaker by the operation will be described. When a load current of a predetermined value or more flows in the load circuit for a predetermined time or more, the bimetal portion 2 constituting the time-delaying means in the tripping device 300 bends more than a predetermined amount from the position shown in FIG. 3 to the right in the drawing. Then, it comes into contact with the trip bar 3 and is rotated clockwise to reach the position shown in FIG. When the trip bar 3 is rotated in the clockwise direction, the engaging portion 31 presses the second engaging portion 42 of the latch 4 in the left direction so that the latch 4 is rotated counterclockwise from the position shown in FIG. The position shown in FIGS. 4, 9, and 10 is obtained.

  When the latch 4 rotates counterclockwise, the first engaging portion 41 of the latch 4 is disengaged from the second engaging portion 163 of the latch 16, and the latch 16 rotates the pin 161 by the urging force of the latch spring 15. It rotates clockwise as the center. By the clockwise rotation of the latch 16, the engagement between the first engagement portion 162 of the latch 16 and the engagement portion 192 of the lever 19 is released. As a result, the lever 19 is released from the prevention of the rotation due to the engagement with the latch 16 and is rapidly rotated clockwise around the pin 191 by the urging force of the main spring 11, and the convex surface portion 193 of FIG. Move to the position shown in.

  In the course of the movement of the convex portion 193 of the lever 19 from the position shown in FIG. 6 to the position shown in FIG. 10, the contact surface between the convex portion 193 of the lever 19 and the concave portion 91 of the first link 9 is changed. The position moves upward in the figure beyond the line of action of the main spring 11. As a result, the first link 9 is rapidly rotated clockwise by the urging force of the main spring 11 with the concave surface portion 91 as the rotation center, and one end portion of the second link 10 is connected via the connection pin 13. The position shown in FIG. 6 is moved to the position shown in FIG. As a result, the cross bar 20 is rapidly driven to the left in the drawing by the second link 10 via the pin 23 and is rotated counterclockwise. As a result, the movable contact 21 is driven counterclockwise by the cross bar 20, and the movable contact 6 is separated from the fixed contact 5 to interrupt the load circuit.

  Next, when the circuit breaker 100 shown in FIGS. 3, 5, and 6 is in an ON state, a trip operation when an overcurrent such as a short-circuit current flows through the load circuit, that is, an operation of the instantaneous tripping means. The trip operation of the circuit breaker will be described. When the circuit breaker 100 is in an on state and a normal load current or an overcurrent that can operate the above-mentioned timed trip means flows, an electromagnet constituting the instantaneous trip means in the trip device 300 The suction force of the electromagnetic coil portion 7 of the device to the plunger portion 8 is smaller than the urging force of a plunger urging spring (not shown) that urges the plunger portion 8 in the left direction in the figure. 8 is pressed to the left in the figure by the plunger biasing spring and is stationary at the position shown in FIG.

  If an excessive current such as a short-circuit current flows in this state, the attractive force of the electromagnetic coil portion 7 to the plunger portion 8 becomes larger than the urging force of the plunger urging spring, and the plunger portion 8 instantaneously It is sucked by the part 7 and moves from the position shown in FIG. 3 to the right in the figure. In the middle of the movement process of the plunger portion 8, the third engaging portion 44 of the latch 4 is engaged with the plunger portion 8, and the latch 4 is moved from the position shown in FIGS. 3, 5, and 6. Rotate clockwise.

  As the latch 4 rotates counterclockwise, the first engaging portion 41 of the latch 4 is disengaged from the second engaging portion 163 of the latch 16, and the latch 16 pulls the pin 161 by the urging force of the latch spring 15. It rotates clockwise as the center of rotation. As a result, the movable contact 6 is separated from the fixed contact 5 in the same manner as the trip operation of the circuit breaker by the operation of the time-delaying means described above, and the load circuit is instantaneously interrupted, and the trip state shown in FIGS. It becomes.

  Next, a description will be given of the reset operation for turning the circuit breaker 100 on again from the trip state shown in FIGS. 9 and 10 after the circuit breaker 100 is tripped by the operation of the above-mentioned timed trip means or instantaneous trip means. To do. To reset the circuit breaker 100, from the trip state shown in FIGS. 9 and 10, the handle 24 is further moved to the reset position in the left direction in the drawing (the almost limit position where the handle 24 can move to the left in the drawing). Move. By the movement of the handle 24 to the reset position, the handle arm 12 rotates counterclockwise about the pin 121 as the rotation center, and the main spring 11 and the first link 9 move downward in the drawing. As a result, the lever 19 rotates counterclockwise around the pin 191 and the engagement between the engaging portion 192 of the lever 19 and the first engaging portion 162 of the latch 16 that has been released during the trip operation. The match is retained.

  Accordingly, the latch 4 that is in contact with the other leg 152 of the latch spring 15 is rotated clockwise from the position shown in FIGS. 9 and 10 with respect to the center of rotation by the urging force of the latch spring 15. To do. The latch 16 that is in contact with one leg 153 of the latch spring 15 by the clockwise rotation of the latch 4 is shown in FIGS. 7 and 8 by the urging force of the latch spring 15 with the pin 161 as the center of rotation. It rotates counterclockwise from the position.

  When the handle 24 is operated to the reset position and then the handle is released from the hand, the trip bar 3 is held at the initial position by the clockwise rotation of the latch 4 and the engaging portion 31 of the trip bar 3 is latched. 4 is engaged with the second engaging portion 42. At the same time, the second engaging portion 163 of the latch 16 is engaged with the first engaging portion 41 of the latch 4. As described above, the circuit breaker 100 is turned off from the trip state shown in FIGS. At this time, the handle 24 is slightly on the right side of the figure from the reset position and stops.

  When the handle 24 is further rotated clockwise from the above-mentioned OFF state and moved to the ON position shown in FIGS. 3, 5, and 6, the position of the tip of the handle arm 12 is simultaneously changed from the OFF position to FIG. , Move to the ON position shown in FIGS. The position of the distal end portion of the handle arm 12 is in the middle of the movement process, and the position of the other end portion of the main spring 11 is the contact position between the concave surface portion 91 of the first link 9 and the convex surface portion 193 of the lever 19. Move over the figure.

  As a result, the main spring 11 rotates the first link 9 counterclockwise with the concave surface portion 91 as the rotation center via the connecting pin 13 by the tensile force, and the concave surface portion 91 of the first link 9. Is moved downward from the reset position from the reset position. As a result, the second link 10 rotates clockwise with the pin 23 as a rotation center and moves to the right in the figure, and the crossbar 20 and the movable contact 21 are rotated clockwise around the rotation center. The movable contact 6 is brought into contact with the fixed contact 5 to close the load circuit.

  Next, the operation when the handle 24 is turned off from the on state of the circuit breaker 100 shown in FIGS. 3, 5, and 6 will be described. By operating the handle 24 to the left in the figure, the handle arm 12 rotates counterclockwise together with the handle 24 around the pin 121 as a rotation center. In the middle of this turning process, the other end of the main spring 11 fixed to the tip of the handle arm 12 is in contact with the concave surface portion 91 of the first link 9 and the convex surface portion 193 of the lever 19. It moves to the position shown in FIGS. 7 and 8 beyond the position.

  Due to the movement of the other end of the main spring 11 described above, the alignment of the first link 9 and the second link 10 is lost, and the connecting pin 13 is driven downward by the pulling force of the main spring 11, The first link 9 and the second link 10 rapidly move from the positions shown in FIGS. 3, 5, and 6 to the positions shown in FIGS. Due to the movement of the second link 10 described above, the crossbar 20 connected to the second link 10 via the pin 23 is driven in the counterclockwise direction, and the movable contact 6 is separated from the fixed contact 5, and the load circuit is Cut off.

  According to the circuit breaker according to Embodiment 1 of the present invention configured as described above, the latch spring 15 has the coil portion 151 inserted into the through hole 142 of the mechanism frame 14 and is held by the mechanism frame 14. A pair of legs 152 and 153 are separately disposed on both sides of the mechanism frame 14. The latch spring 15 has one foot 153 that abuts against the latch 16 to constantly urge the latch 16 counterclockwise, and the other foot 152 that abuts against the latch 4 to keep the latch 4 clockwise. Therefore, the space occupied by the through hole 142 of the mechanism frame 14 that is the latch spring 15 and the latch spring holding portion is only in the vicinity of the mechanism frame on one side of the pair of mechanism frames 14, and the other side. The space between the mechanism frame and the space between the pair of mechanism frames 14 can be used for arranging other components.

  For this reason, an operation trajectory in which the bimetal part 2 constituting the time-delay means in the tripping device 300 and the plunger part 8 constituting the instantaneous trip means move from the position in the on state to the position in the trip state, Regardless of the presence of the latch spring 15, it can be present in the space between the pair of mechanism frames 14, and the circuit breaker 100 can be downsized.

That is, FIG. 17 shows a mechanism that is a latch spring 15 and a latch spring holding portion at the side of the operation locus of the bimetal portion 2 and the plunger portion 8 when the circuit breaker is tripped in the first embodiment of the present invention. 4 is a side sectional view showing the opening / closing mechanism 200 and the tripping device 300 showing a state in which a through hole 142 of the frame 14 exists. FIG.

  In this way, the latch spring 15 and the through hole 142 of the mechanism frame 14 that is the latch spring holding portion are also avoided from the side of the operation trace of the bimetal portion 2 and the plunger portion 8 that are components of the tripping device 300. Since the distance occupied by the opening / closing mechanism 200 in the direction from the power supply side terminal to the load side terminal can be reduced and the width of the opening / closing mechanism 200 can be reduced as compared with the conventional circuit breaker that needs to be arranged, the opening / closing mechanism 200 and the circuit breaker 100 can be downsized.

Embodiment 2. FIG.
FIG. 18 is a perspective view showing a hole for holding a latch spring of a mechanism frame in an opening / closing mechanism of a circuit breaker according to Embodiment 2 of the present invention, and FIG. 19 shows the mechanism frame, the latch spring, a latch, It is a front view which shows a latch. 18 and 19, the mechanism frame 14 includes a through hole 143 formed by burring.

  That is, in the circuit breaker according to the second embodiment of the present invention, a through hole 143 for holding the coil portion 151 of the latch spring 15 is formed at one predetermined position of the pair of mechanism frames 14 facing each other by burring. It is a thing. The inner diameter of the through hole 143 is slightly larger than the outer diameter of the coil portion 151 of the latch spring 15.

  The coil spring 151 of the latch spring 15 is inserted into the through hole 143, and the outermost peripheral portion of the coil portion 151 is held by the mechanism frame 14 by contacting the inner peripheral surface of the through hole 143 of the mechanism frame 14. . The leg portions 152 and 153 of the latch spring 15 are separately disposed on both sides of the mechanism frame 14, and one of the foot portions 152 engages with the spring receiving portion 43 of the latch 4 to rotate the latch 4 in the clockwise direction. And the other foot 153 engages with a spring receiving portion 164 provided at the other end of the latch 16 to urge the latch 16 to rotate counterclockwise. Yes. Other configurations are the same as those of the circuit breaker according to the first embodiment.

  According to the circuit breaker according to the second embodiment, a part of the mechanism frame 14 is subjected to burring to form the through hole 143 as a hole for holding the coil portion 151 of the latch spring 15. The length of the through hole 143 in the axial direction is expanded, and the latch spring 15 is prevented from being deformed by an impact at the time of opening / closing operation of the opening / closing mechanism, and the latch spring 15 is prevented from being easily detached from the through hole 143 of the mechanism frame. Can do.

Embodiment 3 FIG.
20 is a perspective view showing a hole for holding a latch spring of a mechanism frame in an opening / closing mechanism of a circuit breaker according to Embodiment 3 of the present invention. FIG. 21 is a perspective view showing the mechanism frame, latch spring, latch, It is a front view which shows a latch. 20 and 21, the mechanism frame 14 includes a through hole 144 formed in the mechanism frame 14 by bending.

  That is, the circuit breaker according to the third embodiment of the present invention has a pair of extending portions 1441 and 1442 that are bent so as to extend inwardly at one predetermined position of the pair of opposed mechanism frames 14. By forming, a through hole 144 for holding the coil portion 151 of the latch spring 15 is formed. The opposing spacing of the pair of extending portions 1441 and 1442 constituting the through hole 144 and the opposing spacing of the plate thickness direction surfaces 1443 and 1444 of the mechanism frame 14 located on both sides of the pair of extending portions 1441 and 1442 are latch springs. The outer diameter of the 15 coil portions 151 is slightly larger.

  The latch spring 15 has a coil portion 151 inserted into the through hole 144, and the outermost peripheral portion of the coil portion 151 contacts the opposing surfaces of the pair of extending portions 1441 and 1442 forming the through hole 144 of the mechanism frame 14. The mechanism frame 14 is held by contact. The leg portions 152 and 153 of the latch spring 15 are separately disposed on both sides of the mechanism frame 14, and one of the foot portions 152 engages with the spring receiving portion 43 of the latch 4 to rotate the latch 4 in the clockwise direction. And the other foot 153 engages with a spring receiving portion 164 provided at the other end of the latch 16 to urge the latch 16 to rotate counterclockwise. . Other configurations are the same as those of the circuit breaker according to the first embodiment.

  According to the circuit breaker according to the third embodiment, the through holes 144 serving as the holes for holding the latch spring 15 are formed by the extending portions 1441 and 1442 formed by bending a part of the mechanism frame. Therefore, the range for holding the coil portion 151 of the latch spring is expanded, the latch spring 15 is deformed by an impact at the time of opening / closing operation of the opening / closing mechanism, and the latch spring 15 is easily detached from the through hole 144 of the mechanism frame. It can be suppressed.

Embodiment 4 FIG.
FIG. 22 is a perspective view showing a hole for holding a latch spring of a mechanism frame in an opening / closing mechanism of a circuit breaker according to Embodiment 4 of the present invention, and FIG. 23 shows the mechanism frame, latch spring, latch and It is a front view which shows a latch. 22 and 23, the mechanism frame 14 includes a through hole 145 formed in the mechanism frame 14 by shearing by cutting.

  That is, the circuit breaker according to the fourth embodiment of the present invention includes a pair of extending portions 1451 that are sheared by cutting so as to extend inwardly at one predetermined position of the pair of mechanism frames 14 facing each other. By forming 1452, a through-hole 145 is formed as a hole for holding the coil portion 151 of the latch spring 15. The end surfaces 1455 and 1456 of the pair of extending portions 1451 and 1452 constituting the through-hole 145 are configured by planes extending in parallel with the through-direction of the through-hole 145, respectively, and the opposing distance between these end surfaces 1455 and 1456, and the pair of The interval between the plate thickness direction surfaces 1453 and 1454 of the mechanism frame 14 located on both sides of the extending portions 1451 and 1452 is formed to be slightly larger than the outer diameter of the coil portion 151 of the latch spring 15.

  The latch spring 15 has its coil portion 151 inserted into the through hole 145, and the outermost peripheral portion of the coil portion 151 contacts the opposing surfaces of the pair of extending portions 1451 and 1452 forming the through hole 145 of the mechanism frame 14. The mechanism frame 14 is held by contact. The leg portions 152 and 153 of the latch spring 15 are separately disposed on both sides of the mechanism frame 14, and one of the foot portions 152 engages with the spring receiving portion 43 of the latch 4 to rotate the latch 4 in the clockwise direction. And the other foot 153 engages with a spring receiving portion 164 provided at the other end of the latch 16 to urge the latch 16 to rotate counterclockwise. . Other configurations are the same as those of the circuit breaker according to the first embodiment.

  According to the circuit breaker according to the fourth embodiment of the present invention, the extending portion 1451 and 1452 formed by performing a shearing process by cutting a part of the mechanism frame 14 as a hole portion that holds the latch spring 15. Since the hole 145 is formed, the range for holding the coil portion 151 of the latch spring is expanded, and the latch spring 15 is deformed by an impact at the time of the opening / closing operation of the opening / closing mechanism, and the latch spring is moved from the through hole 145 of the mechanism frame. It can suppress that 15 becomes easy to remove | deviate.

Embodiment 5 FIG.
FIG. 24 is a perspective view showing a hole for holding a latch spring of a mechanism frame in an opening / closing mechanism of a circuit breaker according to Embodiment 5 of the present invention, and FIG. 25 shows the mechanism frame, the latch spring, a latch, It is a front view which shows a latch. 24 and 25, the mechanism frame 14 has a hole formed by inserting a cylindrical member 17 into a through hole provided in the mechanism frame 14 and joining the cylindrical member 17 to the mechanism frame 14. A through-hole 146 is provided as a part.

  That is, in the circuit breaker according to Embodiment 5 of the present invention, a metallic cylindrical member 17 is press-fitted into a through hole provided at one predetermined position of a pair of opposed mechanism frames 14. By joining the mechanism frame 14 by welding or brazing or the like, a through-hole 146 that is a hole for holding the coil portion 151 of the latch spring 15 is formed. The cylindrical member 17 includes a flange portion 171 on the outer peripheral surface thereof, and a side surface of the flange portion 171 is joined to the mechanism frame 14. Other configurations are the same as those of the circuit breaker according to the first embodiment.

  According to the circuit breaker according to the fifth embodiment of the present invention, the cylindrical member 17 is joined to the mechanism frame 14 to form the through hole 146 as a hole for holding the latch spring 15. This prevents the latch spring 15 from being easily deformed from the through hole 146 of the mechanism frame by deforming the latch spring 15 due to an impact at the time of opening / closing operation of the opening / closing mechanism. it can.

Embodiment 6 FIG.
FIG. 26 is a perspective view showing a hole for holding a latch spring of a mechanism frame in an opening / closing mechanism of a circuit breaker according to Embodiment 6 of the present invention, and FIG. 27 is a diagram showing an ON state of the circuit breaker. It is a perspective view which shows a mechanism frame, a latch spring, a latch, and a latch in an opening-and-closing mechanism part. 26 and 27, the mechanism frame 14 includes a through hole 147 as a hole for holding the latch spring 15, and a through groove 148 connected to the through hole 147 from the end surface of the mechanism frame 14. The inner diameter of the through hole 147 is formed to be slightly larger than the outer diameter of the coil portion 151 of the latch spring 15, and the groove width of the through groove 148 is slightly larger than the diameter of the legs 152 and 153 of the latch spring 15.

  In the circuit breaker according to the sixth embodiment of the present invention, the through hole 147 of the mechanism frame 14 is connected to the end face of the mechanism frame 14 by the through groove 148, so that the foot on one side of the latch spring 15 from the outside of the mechanism frame 14. The coil portion 151 can be inserted into the through hole 147 by passing the portion 153 through the through groove 148. Other configurations are the same as those of the circuit breaker according to the first embodiment.

  According to the circuit breaker according to the sixth embodiment, the through hole 147 of the mechanism frame 14 is connected to the end surface of the mechanism frame 14 by the through groove 148, so that the foot 153 on one side of the latch spring 15 is connected to the through groove 148. Since the latch spring 15 can be easily assembled in the through hole 147 of the mechanism frame 14, the latch spring 15 can be prevented from being deformed, and the opening / closing mechanism portion can be easily assembled. Become.

Embodiment 7 FIG.
FIG. 28 is a perspective view showing a mechanism frame, a latch spring, a latch, a latch, and a base housing in the opening / closing mechanism section in the on state of the circuit breaker according to the seventh embodiment of the present invention. FIG. It is a front view which shows a flame | frame, a latch spring, a latch, a latch, and a base housing | casing. 28 and 29, the base housing 1 that holds the mechanism frame 14 includes a pair of legs 152 and 153 of the latch spring 15 inserted into a through hole 142 as a hole of the mechanism frame 14. Wall portions 1011 and 1012 located outside are provided. That is, the wall portions 1011 and 1012 of the base housing 1 are arranged so as to sandwich both axial sides of the latch spring 15. The wall portions 1011 and 1012 may be formed of a member different from the base housing 1. Other configurations are the same as those of the circuit breaker according to the first embodiment.

  According to the circuit breaker according to the seventh embodiment, the wall portions 1011 and 1012 formed of the same member as the base housing 1 or a member different from the base housing 1 are sandwiched on both sides of the latch spring 15. Since the movement of the latch spring 15 in the axial direction is restricted to the range until it abuts against the walls 1011 and 1012, the latch spring 15 is deformed by an impact during the opening / closing operation of the opening / closing mechanism. The latch spring 15 can be prevented from coming off from the through hole 142 of the mechanism frame.

Embodiment 8 FIG.
30 is a perspective view showing a hole for holding a latch spring and a latch spring of a mechanism frame in an opening / closing mechanism of a circuit breaker according to Embodiment 8 of the present invention, and FIG. FIG. 32 is a perspective view showing a mechanism frame and a latch spring, a latch spring, a latch, and a latch in the opening / closing mechanism in the state, FIG. 32 is a mechanism frame and a latch spring in the opening / closing mechanism in the ON state of the circuit breaker FIG. 33 is a front view showing the mechanism frame, the latch spring, the latch spring, the latch, and the latch.

  30 to 33, a circuit breaker according to an eighth embodiment of the present invention is provided with a latch spring 18 for biasing the latch 4 and a latch spring 15 for biasing the latch 16, respectively. The latch spring 18 includes a coil portion 181 and a pair of foot portions 182 and 183 provided at both axial ends of the coil portion 181.

  The mechanism frame 14 includes a through hole 1490 as a first hole and a through hole 1500 as a second hole. The inner diameter of the through-hole 1500 serving as the second hole is slightly larger than the outer diameter of the coil portion 181 of the latch spring 18. At least one of these through holes 1490 and 1500 is subjected to burring shown in the second embodiment, bending of the mechanism frame 14 shown in the third embodiment, or mechanism shown in the fourth embodiment. Shearing by cutting into the frame 14 or formation by inserting the cylindrical member 17 into the through hole provided in the mechanism frame 14 shown in the fifth embodiment and joining the cylindrical member 17 to the mechanism frame 14. It can be formed by either.

  The coil spring 181 of the latch spring 18 is inserted into the through hole 1500, and the outer peripheral portion having the maximum outer diameter is held by the mechanism frame 14 by contacting the inner peripheral surface of the through hole 1500. The pair of foot portions 182 and 183 of the latch spring 18 are disposed so as to be separately located on both sides of the mechanism frame 14, and one of the foot portions 182 is engaged with the spring receiving portion 43 of the latch 4. The other foot 183 is in contact with the mechanism frame 14. As a result, the latch 4 is urged by the latch spring 18 so as to always rotate clockwise. Other configurations are the same as those in the first embodiment.

  Note that at least one of the through holes 1490 and 1500 may be connected to the end face of the mechanism frame 14 by the through groove shown in the sixth embodiment. Further, as shown in the seventh embodiment, a wall portion is provided on the outer side of at least one of the latch spring 15 and the latch spring 18, and at least one of the latch spring 15 and the latch spring 18 is provided. You may make it prevent the movement to an axial direction.

  According to the circuit breaker according to the eighth embodiment, the space occupied by the latch spring 15 and the latch spring 18 is only in the vicinity of one of the pair of mechanism frames 14 and in the vicinity of the other mechanism frame. And the space part between a pair of mechanism frames 14 can be used for arrangement of other parts.

  For this reason, an operation trajectory in which the bimetal part 2 constituting the time-delay means in the tripping device 300 and the plunger part 8 constituting the instantaneous trip means move from the position in the on state to the position in the trip state, Regardless of the presence of the latch spring 15 and the latch spring 18, it can be present in the space between the pair of mechanism frames 14, and the circuit breaker 100 can be downsized. Further, since the distance occupied by the opening / closing mechanism 200 in the direction from the power supply side terminal to the load side terminal can be reduced and the width of the opening / closing mechanism 200 can be reduced, the downsizing of the opening / closing mechanism 200 and the circuit breaker can be achieved. 100 can be miniaturized.

It is a perspective view which shows the external appearance of the circuit breaker by Embodiment 1 of this invention. It is a perspective view which shows the opening-and-closing mechanism part in the state which removed the cover part of the circuit breaker by Embodiment 1 of this invention, the trip apparatus, and a base housing | casing. It is a perspective view which shows the opening-and-closing mechanism part and tripping device in the ON state of the circuit breaker by Embodiment 1 of this invention. It is a perspective view which shows the switching mechanism part and tripping device in the trip state of the circuit breaker by Embodiment 1 of this invention. It is a perspective view which shows the opening-closing mechanism part in the ON state of the circuit breaker by Embodiment 1 of this invention. It is a sectional side view which shows the switching mechanism part in the ON state of the circuit breaker by Embodiment 1 of this invention. It is a perspective view which shows the opening-closing mechanism part in the OFF state of the circuit breaker by Embodiment 1 of this invention. It is a sectional side view which shows the switching mechanism part in the OFF state of the circuit breaker by Embodiment 1 of this invention. It is a perspective view which shows the opening-closing mechanism part in the trip state of the circuit breaker by Embodiment 1 of this invention. It is a sectional side view which shows the switching mechanism part in the trip state of the circuit breaker by Embodiment 1 of this invention.

It is a perspective view which shows the hole which hold | maintains the latch spring of the mechanism frame of the switching mechanism part of the circuit breaker by Embodiment 1 of this invention. It is a perspective view which shows the mechanism frame in the ON state of the circuit breaker by Embodiment 1 of this invention, a latch spring, a latch, and a latch. It is a sectional side view which shows the mechanism frame in the ON state of the circuit breaker by Embodiment 1 of this invention, a latch spring, a latch, and a latch. It is a front view which shows the mechanism flame | frame, latch spring, latch, and latch which were seen from the X direction of FIG. 6 of the circuit breaker by Embodiment 1 of this invention. It is a perspective view which shows the mechanism frame in the trip state of the circuit breaker by Embodiment 1 of this invention, a latch spring, a latch, and a latch. It is a sectional side view which shows the mechanism frame in the trip state of the circuit breaker by Embodiment 1 of this invention, a latch spring, a latch, and a latch. It is a sectional side view which shows the opening-and-closing mechanism part in the state which has the operation locus of a bimetal part and a plunger part on the latch spring and latch spring holding part of the circuit breaker by Embodiment 1 of this invention. It is a perspective view which shows the hole which hold | maintains the latch spring of the mechanism frame of the switching mechanism part of the circuit breaker by Embodiment 2 of this invention. It is a front view which shows the mechanism frame, latch spring, latch, and latch of the circuit breaker by Embodiment 2 of this invention. It is a perspective view which shows the hole holding the latch spring of the mechanism frame of the switching mechanism part of the circuit breaker by Embodiment 3 of this invention.

It is a front view which shows the mechanism frame, latch spring, latch, and latch of the circuit breaker by Embodiment 3 of this invention. It is a perspective view which shows the hole holding the latch spring of the mechanism frame of the switching mechanism part of the circuit breaker by Embodiment 4 of this invention. It is a front view which shows the mechanism frame, latch spring, latch, and latch of the circuit breaker by Embodiment 4 of this invention. It is a perspective view which shows the hole holding the latch spring of the mechanism frame of the switching mechanism part of the circuit breaker by Embodiment 5 of this invention. It is a front view which shows the mechanism frame, latch spring, latch, and latch of the circuit breaker by Embodiment 5 of this invention. It is a perspective view which shows the hole holding the latch spring of the mechanism frame of the switching mechanism part of the circuit breaker by Embodiment 6 of this invention. It is a perspective view which shows the mechanism frame in the ON state of the circuit breaker by Embodiment 6 of this invention, a latch spring, a latch, and a latch. It is a perspective view which shows the mechanism frame in the ON state of the circuit breaker by Embodiment 7 of this invention, a latch spring, a latch, a latch, and a base housing | casing. It is a front view which shows the mechanism frame, latch spring, latch, latch, and base housing | casing of the circuit breaker by Embodiment 7 of this invention. It is a perspective view which shows the hole which hold | maintains the latch spring and latch spring of the mechanism frame of the switching mechanism part of the circuit breaker by Embodiment 8 of this invention.

It is a perspective view which shows the mechanism frame in the ON state of the circuit breaker by Embodiment 8 of this invention, a latch spring, a latch spring, a latch, and a latch. It is a sectional side view which shows the mechanism frame in the ON state of the circuit breaker by Embodiment 8 of this invention, a latch spring, a latch spring, a latch, and a latch. It is a front view which shows the mechanism flame | frame and latch spring, latch spring, latch, latch of the circuit breaker by Embodiment 8 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base housing | casing 101 Base 102 Middle base 2 Bimetal part 3 Trip bar 4 Latch 5 Fixed contact 6 Movable contact 7 Electromagnetic coil part 8 Plunger part 9 1st link 10 2nd link 11 Main spring 12 Handle arm 121,161 , 191 Pin 122 Spring hook part 13 Connect pin 14 Mechanism frame 142, 143, 144, 145, 146, 147 Hole part 148 Groove part 1490 First hole part 1500 Second hole part 1441, 1442 Extension part 1451, 1452 Extension Residual portion 15 Latch spring 151 Coil portions 152 and 153 Foot portion 16 Latch 17 Cylindrical member 18 Latch spring 100 Circuit breaker 200 Opening and closing mechanism portion 300 Tripping device

Claims (14)

A movable contact provided with a movable contact opposed to the fixed contact, and when driven, the movable contact is separated or brought into contact with the fixed contact to interrupt or close an electric circuit;
A tripping device that operates when a current of a predetermined value or more flows through the electrical circuit;
A trip bar provided rotatably and driven in accordance with the operation of the tripping device to rotate in a predetermined direction;
The trip bar is provided so as to be engageable via a latch, and is always urged to rotate in a predetermined direction by a latch spring. When engaged, the rotation is prevented, and the trip bar A latch that, when rotated, disengages the engagement and rotates in the predetermined direction;
An opening / closing mechanism that is provided so as to be engageable with the latch, and is disengaged from the latch when the latch rotates in the predetermined direction to drive the movable contact to shut off or close the electric circuit. A circuit breaker comprising:
The latch spring includes a coil portion and a pair of feet provided at both ends of the coil portion, and the coil portion is inserted into a hole provided in a mechanism frame that holds the opening / closing mechanism portion. Held by the mechanism frame,
The pair of foot portions of the latch spring are separately disposed on both sides of the mechanism frame with the mechanism frame interposed therebetween, and one foot portion of the pair of foot portions abuts on the latch and A circuit breaker characterized by energizing the latch and energizing the latch with the other foot contacting the latch.   The circuit breaker according to claim 1, wherein the hole is formed by burring a part of the mechanism frame.   2. The circuit breaker according to claim 1, wherein the hole is formed by bending a part of the mechanism frame.   The circuit breaker according to claim 1, wherein the hole is formed by shearing a part of the mechanism frame by cutting.   The circuit breaker according to claim 1, wherein the hole is formed by fixing a hollow cylindrical member in a through hole provided in a part of the mechanism frame.   2. The circuit breaker according to claim 1, wherein the hole is connected to an end surface of the mechanism frame by a groove through which at least one of the pair of legs of the latch spring can pass.   The circuit according to any one of claims 1 to 6, wherein a wall portion for restricting movement of the latch spring in the axial direction is provided on an outer side of both legs of the latch spring. Circuit breaker. A movable contact provided with a movable contact opposed to the fixed contact, and when driven, the movable contact is separated or brought into contact with the fixed contact to interrupt or close an electric circuit;
A tripping device that operates when a current greater than or equal to a predetermined value flows in the electrical circuit;
A trip bar provided rotatably and driven in accordance with the operation of the tripping device to rotate in a predetermined direction;
The trip bar is provided so as to be engageable via a latch, and is always urged to rotate in a predetermined direction by a latch spring. When engaged, the rotation is prevented, and the trip bar A latch that, when rotated, disengages the engagement and rotates in the predetermined direction;
A latch spring that constantly urges the latch, and a latch spring that can be engaged with the latch. When the latch rotates in the predetermined direction, the latch is disengaged to drive the movable contact. A circuit breaker provided with an opening and closing mechanism for closing or closing the electric circuit,
The latch spring includes a coil part and a pair of legs provided at both ends of the coil part, and the coil part is provided in a first hole provided in a mechanism frame that holds the opening / closing mechanism part. Inserted into the mechanism frame, one of the pair of feet abuts the latch and urges the latch;
The latch spring includes a coil portion and a pair of foot portions provided at both ends of the coil portion, and the coil portion is provided in a second hole portion provided in a mechanism frame that holds the opening / closing mechanism portion. A circuit breaker, wherein the circuit breaker is held by the mechanism frame by being inserted, and one of the pair of feet abuts the latch to bias the latch.   The circuit breaker according to claim 9, wherein at least one of the first hole and the second hole is formed by burring a part of the mechanism frame. .   10. The circuit breaker according to claim 9, wherein at least one of the first hole and the second hole is formed by bending a part of the mechanism frame. .   10. The circuit according to claim 9, wherein at least one of the first hole and the second hole is formed by shearing a part of the mechanism frame by cutting. Circuit breaker.   At least one of the first hole and the second hole is formed by fixing a hollow cylindrical member to a through hole provided in a part of the mechanism frame. The circuit breaker according to claim 9.   At least one of the first hole and the second hole is connected to an end surface of the mechanism frame by a groove that allows passage of at least one of the pair of legs of the latch spring. The circuit breaker according to claim 9.   The wall portion for restricting the movement of the latch spring or the latch spring in the axial direction is provided outside each of the leg portions of at least one of the latch spring and the latch spring. The circuit breaker according to any one of 9 to 13.

Images