JP2010129237A - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate screwing operation of an adjusting screw when performing time regulation of overload current tripping operation. <P>SOLUTION: The circuit breaker 1 includes a contact part 3, an opening/closing mechanism 4, a latch means 5, and a tripping means 6 which are provided within a device body 2. The contact part 3 is inserted to a main circuit between a power source and a load. The opening/closing mechanism 4 opens/closes the contact part 3 by operating an operation part 11 exposed to a front surface 8 of the device body 2 from the outside of the device body 2. The tripping means 6 includes a bimetal 6a and an adjusting screw 21. The bimetal 6a has one end fixed to the rear end surface within the device body 2, and includes a free end 6b extended forward within the device body 2 at the other end. The adjusting screw 21 is screwed to a thread hole 6c provided through in the free end 6b. When overload current is carried to the main circuit, the free end 6b is displaced to cause the adjusting screw 21 to press the latch means 6 opposed thereto, whereby the locking of the opening/closing mechanism 4 with the latch means 6 is released to forcedly open the contact part 3. The free end 6b is inclined so that the head of the adjusting screw 21 is turned to the front of the device body 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a circuit breaker.

Conventionally, when an overcurrent flows through a main circuit that is attached to a distribution board or the like and is inserted between a power source and a load, the contact part of the main circuit is pulled off to cut off the power supply to the load. A circuit breaker is provided. Such a circuit breaker generally includes the aforementioned contact portion, an opening / closing mechanism, a latch means, and a tripping means inside a container body that forms an outline. The open / close mechanism is exposed to the front of the container body and opens and closes the contact part by opening and closing the operation part that can be operated from the outside of the container body, and the latch means is biased against the force applied in the direction in which the contact part opens. When the overcurrent flows through the main circuit, the tripping means releases the locking and forcibly opens the contact portion.

By the way, there are two types of tripping means: an electromagnetic type that detects a short-circuit current to cut off power supply and a thermal type that detects an overload current and cuts off power supply. Among them, the thermal trip means includes a bimetal and an adjusting screw. This bimetal is a superposition of two metals having different coefficients of thermal expansion. One end is fixed to the rear end surface of the body, and the other end has a free end extending toward the front of the body. is doing. The adjusting screw is screwed into a screw hole penetrating the free end. When an overload current flows through the main circuit, the amount of heat generated by the bimetal electrically connected to the main circuit increases, and the free end is displaced toward the latch means arranged opposite to the main circuit. Along with this, the adjusting screw presses the latch means, so that the aforementioned locking is released and the contact portion is forcibly opened. Various types of such circuit breakers have been conventionally provided (see, for example, Patent Documents 1 and 2).
JP 2001-28225 A JP 2002-231118 A

However, in the circuit breaker having the tripping means using the conventional bimetal, the screwing direction of the adjusting screw is parallel to the front surface of the device body. For this reason, when adjusting the operating time from when the overload current starts to flow until the bimetal is displaced and the contact part is pulled off by screwing the adjusting screw with the screwdriver to the opposite latch means with a screwdriver or the like, The adjustment screw had to be screwed while maintaining the longitudinal direction of the driver in the parallel direction, and there was a problem that workability was poor.

The present invention has been made in view of the above-mentioned reasons, and an object thereof is to provide a circuit breaker that can easily perform the screwing operation of the adjusting screw at the time of adjusting the operation time of overload current tripping. There is.

In order to achieve the above-mentioned object, the invention of claim 1 exposes the contact portion inserted into the main circuit between the power source and the load inside the vessel body forming the outer shell and the front surface of the vessel body. An opening / closing mechanism that opens and closes the contact portion by opening / closing an operation portion that can be operated from the outside of the container, and an engagement mechanism that engages with the opening / closing mechanism in a state of being biased against a force applied in a direction in which the contact portion opens. Latching means for stopping, and tripping means for releasing the locking and forcibly opening the contact portion when an overcurrent flows in the main circuit, and the tripping means has one end portion at the rear of the body. A bimetal having a free end fixed to the end face and extending to the front in the body at the other end, and an adjustment screw screwed into a screw hole penetrating the free end; When an overload current flows through the free end, the free end is displaced and the adjustment screw faces Releasing the locking by pressing the latch means, said free end, characterized in that the screw head of the adjusting screw is inclined in a direction facing the front of the device body.

According to this invention, the free end of the bimetal is inclined in a direction in which the screw head of the adjustment screw faces the front of the instrument body. The adjustment screw can be screwed from the front to the back while being inserted and held in the longitudinal direction of the driver, so that the adjustment screw can be screwed when adjusting the operating time for overload current tripping. Work can be done easily.

In the present invention, there is an effect that the adjustment screw can be easily screwed when adjusting the operation time for overload current tripping.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the following description, front, rear, left, right, up and down directions are defined in FIG. As shown in FIG. 1, the circuit breaker 1 according to the present embodiment includes a contact portion 3, an opening / closing mechanism 4, a latch means 5, and a tripping means 6 inside a container body 2 that forms an outline.

As shown in FIGS. 1 and 2, the container body 2 is formed of a synthetic resin material into a case 2a having a front surface opened and formed in a substantially rectangular box shape, and a rear surface opened in a flat and substantially rectangular box shape. And a cover 2b. As shown in FIG. 2, assembly holes 7 penetrating in the front-rear direction are formed in substantially four corners of the case 2a and the cover 2b in the vertical and horizontal directions. When the rims are inserted through the assembly holes 7 by combining the peripheral edges of the opening sides of the case 2a and the cover 2b so as to face each other, the case 2a and the cover 2b are fixed to form the body 2. A substantially central portion of the front surface 8 of the container body 2 protrudes forward in a rectangular plate shape, and further, a concave portion 9 is formed in the central portion of the protruding portion that is recessed rearward in a rectangular shape. As shown in FIG. 1, the recess 9 is formed with a through hole 10 penetrating in a rectangular shape into the inside of the container body 2 from the substantially central part in the vertical direction to the lower end part. In addition, on the front surface 8,
A display window 22 is provided which is arranged side by side on the right side of the recess 9 and penetrates the container body 2 in a rectangular shape and is fitted with a lens for enlarging characters. Inside the container 2 is a display window 2
2 is housed a member (not shown) on which characters indicating the state of the main circuit (normal state or abnormal state in which an overcurrent flows) is stored. The state of the circuit can be confirmed. A terminal block 23 that is recessed rearward in the left-right direction is disposed at the upper end of the container body 2 as shown in FIG. Three input terminals 25, 25, 25 each including a screw terminal having a terminal screw 24 are juxtaposed in the left-right direction. Further, the terminal block 23 has insulating walls 13, 1 that insulate between adjacent input terminals 25, 25.
3 is formed to protrude forward. At the right end of the body 2 is a terminal mounting portion 1 that protrudes upward.
4 are integrally formed, and on the right side thereof, three output terminals 26, 26, 26 projecting from the inside of the vessel body 2 are arranged in the front-rear direction such as a rear end portion, a front end portion, and a rear end portion. It is arranged in parallel in the vertical direction while changing the position alternately. Input terminals 25, 25, 25 and output terminals 26, 26,
26, and the input terminals 25, 25, 25 are connected to a commercial power source through voltage conductors and neutral wire conductors (not shown), respectively, and output terminals 26, 26,2
6 are each connected to a load via a conductive bar (not shown) serving as a bus. The circuit breaker 1 is installed with the rear surface of the body 2 facing the inner bottom surface of the distribution board.

As shown in FIG. 1, the contact portion 3 includes a fixed contact 16 and a movable contact 17.
In the vessel 2, three such contact portions 3 are arranged in the left-right direction, and the input terminal 25
, 25, 25 and the output terminals 26, 26, 26 are respectively inserted into the main circuits. That is, the circuit breaker 1 according to the present embodiment is a multipolar circuit breaker including three-pole contact portions 3, 3, and 3. The fixed contacts 16, 16, 16 and the movable contacts 17, 17, 17 are each 1
It is opposed in a pair. In the drawings of this embodiment, only the central contact portion 3 is shown.

As shown in FIG. 1, the stationary contacts 16, 16, 16 are made of a single elongated rectangular plate formed of a conductive material, and one end portion (the upper end portion in the figure) is the upper end of the container body 2. It is fixed to the input terminal 25 of the part by a terminal screw 24. Then, it extends downward from one end, bends backward from substantially the center in the longitudinal direction to the other end, and further bends downward near the other end. Further, fixed contacts 16a, 16a are connected to the other end portions of the fixed contacts 16, 16, 16 respectively.
16a are fixed to each other.

As shown in FIG. 1, the movable contacts 17, 17, 17 are made of a single elongated rectangular plate formed of a conductive material, and movable contacts 17 a, 17 a, 17 a are respectively fixed to one end portions thereof. Yes. Further, the movable contacts 17, 17, and 17 are arranged so that the movable contacts 17a, 17a, and 17a face the paired fixed contacts 16a, 16a, and 16a on the front side. The other end portions of the movable contacts 17, 17, 17 are disposed below the substantially central portion in the vertical direction of the container body 2. The movable contacts 17, 17, 17 are locking grooves 30 a, 30 a of the movable frame 30 described later.
, 30a and supported by the movable frame 30. Furthermore, the movable contacts 17, 1
As shown in FIG. 1, 7 and 17 are protrusions 27, 27, 2 that protrude from the rear end surface of the container 2.
7 and convex portions 17b, 17b, 17b protruding from the movable contacts 17, 17, 17 are urged forward by coil springs 28, 28, 28 respectively interposed. The other end of the movable contacts 17, 17, 17 is restricted from moving downward and forward by an L-shaped stopper 2 c that protrudes forward from the rear end surface in the body 2 in the left-right direction. Is done. The movable contacts 17a, 17a, and 17a come into contact with the fixed contacts 16a, 16a, and 16a facing each other so as to be able to contact and separate in the front-rear direction as the movable frame 30 moves in the front-rear direction.

As shown in FIGS. 1 and 3, the opening / closing mechanism 4 includes an operation unit 11, a movable frame 30, a locking link 31, an operation unit link 32, and a frame 33 (not shown in FIG. 1). Composed.

As shown in FIG. 3, the frame 33 has a pair of side pieces 33a and 33a formed by cutting out two rectangular plates formed of a metal material into substantially the same shape, and the pair of side pieces 33a and 33a at the upper ends. It is comprised from the connection piece 33b formed in the rectangular plate shape connected by a part. Each side piece 33a, 3
Fixing pieces 33d, 3 each having a screw hole 33c projecting outward at the rear end of 3a.
3d is provided (only the left fixing piece 33d is shown in FIG. 3), and is fixed to a mounting base (not shown) projecting from the rear end surface of the container 2 with screws. The front end portions of the side pieces 33a and 33a protrude forward in a disc shape, and bearing holes 33e and 33e penetrating in the left-right direction are formed in the center portion of the disc portion. Of the side pieces 33a, 33a, the left side piece 33a,
A hooking groove 33f is formed in the lower front end portion of the front portion. Further, guide grooves 33g, 33 penetrating in a circular arc shape downward from the vicinity of the upper ends of the side pieces 33a, 33a.
Each g is formed. Cylindrical shaft protrusions 33h and 33h project from the inner surfaces of the side pieces 33a and 33a facing each other. Near the lower ends of the side pieces 33a, 33a, bearing holes 33i, 33i penetrating in the left-right direction are formed.

As shown in FIGS. 1 and 3, the operation portion 11 is formed in a substantially L-shaped plate shape as a whole by a synthetic resin material, and has a horizontal portion 11 a extending in the vertical direction and a standing portion 11 b extending in the front-rear direction.
It consists of. The horizontal portion 11 a is exposed to the front surface 8 of the vessel body 2 through the through hole 10 of the vessel body 2, and the standing portion 11 b is accommodated inside the vessel body 2. The operation unit 11 has a horizontal portion 11a.
A shaft pin 19 that passes through a shaft hole 11c that is drilled in the left-right direction near the root of the upright portion 11b.
The both ends of the shaft pin 19 are received by the bearing holes 33e of the frame 33. That is, if the horizontal portion 11a is manually operated from the outside of the container body 2, a rotation operation around the shaft pin 19 can be performed. Further, a hooking portion 11d protrudes from the lower end portion of the horizontal portion 11a, and when the front end portion of the horizontal portion 11a is in a state of being turned upward, the hooking portion 11 is formed at the lower end portion of the recess 9. It latches in the hollow 9a arrange | positioned. A bearing portion 11e formed in a cylindrical shape is disposed at the rear end portion of the standing portion 11b with the longitudinal direction thereof directed in the left-right direction.
Furthermore, the bearing part 11e is provided with a link shaft hole 11f that penetrates both left and right ends thereof.
As shown in FIG. 1, in the vicinity of the root of the upright portion 11 b on the left side of the operation portion 11, the shaft hole 11 c is recessed in the right direction in a substantially donut shape, and the lower half of the peripheral portion of the donut is opened. A spring receiving groove 11g is provided. Here, an operation portion return spring 34 made of a saddle spring is attached to the inner peripheral edge of the spring receiving groove 11g. As shown in FIG. 3, an engaging piece 34 a bent in a hook shape is provided at one end of the operation part return spring 34, and this engaging piece 34 a is engaged with the hooking groove 33 f of the frame 33. Has been. Therefore, the operation unit 1
1 is urged in a direction in which the laterally arranged portion 11 a stands up forward by the elastic restoring force of the operation portion return spring 34.

As shown in FIG. 3, the operation unit link 32 includes a pair of leg pieces 32a and 32a and a connecting portion 32b.
And the drive shaft 32c, and is formed in a substantially square shape as a whole. The pair of leg pieces 32a, 32a are formed in a substantially strip shape, and link bearing holes 32d, 32d penetrating in the left-right direction are formed in the front end portion. The connecting portion 32b is formed in an elongated rectangular plate shape, and connects both leg pieces 32a and 32a. The drive shaft 32c is formed in a cylindrical shape, and both ends in the left-right direction are fixed to the inner lower ends of both leg pieces 32a and 32a. The link shaft pin 29 is inserted into the link shaft hole 11f and the link bearing holes 32d and 32d of the operation unit 11, and both ends of the link shaft pin 29 projecting outward from the link bearing holes 32d and 32d. The portions are inserted and locked in the guide grooves 33g and 33g of the frame 33, respectively.
That is, the movement range of the operation unit link 32 is restricted by the guide grooves 33g and 33g.

As shown in FIG. 3, the locking link 31 is formed by bending a rectangular plate into a substantially square shape.
1a and a pair of arm pieces 31b, 3 projecting upward from the left and right sides of the front end of the locking plate 31a
1b. In addition, bearing grooves 31c and 31c that are recessed downward in a substantially semicircular shape are formed at the tip portions of the arm pieces 31b and 31b. Both the bearing grooves 31c and 31c support the shaft protrusions 33h and 33h of the frame 33, respectively, so that the locking link 31 is rotatably attached to the frame 33.

As shown in FIG. 3, the movable frame 30 is formed in a substantially rectangular plate shape by a synthetic resin material, and is arranged with its longitudinal direction facing the left-right direction and the short side direction facing the front-rear direction. It is stored so that it can move forward and backward. Further, as described above, the movable frame 30 has three movable contacts 1.
Locking grooves 30a, 30a, and 30a through which 7, 17, and 17 are inserted and locked are juxtaposed in the left-right direction.

As shown in FIG. 1, the drive shaft 32 c of the operation unit link 32 is in contact with the front end portion at the center in the left-right direction of the movable frame 30 and the upper surface of the locking plate 31 a of the locking link 31.

As shown in FIG. 3, the latch means 5 includes a latch plate 5a, a latch plate return spring 5b, and a latch plate shaft pin 5c. The latch plate 5a is formed in a substantially rectangular plate shape with a synthetic resin material, and straddles the movable contacts 17, 17, 17 with its longitudinal direction facing the left-right direction and the lateral direction facing the front-rear direction. Be placed. Further, the front end portion of the latch plate 5a is inclined upward in the left-right direction. A substantially L-shaped leg piece 5d protruding rearward is disposed at the rear end portion of the center in the left-right direction of the latch plate 5a so as to face the lower surface of the lock plate 31a of the lock link 31. A bearing portion 5e having a bearing hole through which the latch plate shaft pin 5c is inserted in the left-right direction is formed at the bent portion of the leg piece 5d. And the bearing hole 33i of the frame 33
, 33i are inserted through the end portions of the latch plate shaft pin 5c protruding from both ends of the bearing portion 5e, so that the latch plate 5a is rotatably attached to the frame 33. Here, a latch plate return spring 5b made of a saddle spring is attached to the outer peripheral surface of the left end portion of the bearing portion 5e. A latching piece 5f formed by bending one end of the latch plate return spring 5b into a hook shape is hooked on the peripheral portion of the left side piece 33a of the frame 33. That is, the latch plate return spring 5
The leg piece 5d is urged by the elastic restoring force b in the direction of pressing the locking plate 31a of the opposing locking link 31 from below.

The tripping means 6 includes bimetals 6a, 6a, 6a and adjusting screws 21, 2, as shown in FIG.
1 and 21. The bimetals 6a, 6a, 6a are formed in an elongated rectangular plate shape extending in the front-rear direction by overlapping two metals having different thermal expansion coefficients, and are arranged in parallel in the left-right direction on the rear end face in the vessel body 2. (In the figure, only one arranged at the center is shown). In addition, since the circuit breaker which uses the bimetal for the tripping means is already known, the description of the characteristics of the bimetal is omitted. And bimetal 6a, 6a, 6a is each one end part (rear end part in a figure)
Is fixed to the rear end surface of the container body 2, and the other end portion (front end portion in the figure) has free ends 6 b, 6 b, 6 b extending forward in the container body 2. Further, the bimetals 6a, 6a, 6a are respectively associated with the movable contacts 17, 17, 17 arranged on the upper side in a one-to-one correspondence, and have flexible wires such as braided wires (not shown). And the movable contacts 17, 17, 17 are electrically connected to each other. The one end side of each of the bimetals 6a, 6a, 6a is connected to a connection line (not shown) via a terminal fitting or the like, and the connection line passes through the terminal mounting part 14 from the lower side in the body 2. It is connected to the output terminals 26, 26, 26 described above. That is, the movable contacts 17, 17, and 17 are electrically connected to the output terminals 26, 26, and 26, respectively. The free ends 6b, 6b, 6b are arranged to face the latch plate 5a, and are inclined upward like the front end portion of the latch plate 5a, and screw holes 6c, 6c, 6c are provided therethrough. Has been. Adjustment screws 21, 21, 21 are screwed into the screw holes 6 c, 6 c, 6 c with their screw heads facing forward.

The basic operation of the circuit breaker 1 of the present embodiment as described above will be described with reference to FIG. As shown in FIG. 4 (b), the horizontal portion 11a is manually depressed against the elastic return force of the operation portion return spring 34 with respect to the horizontal portion 11a of the operation portion 11 in the state of standing upward. 9 is rotated so as to face down toward the bottom side (rear in the figure). Then, as shown in FIG.
One upright portion 11 b rotates toward the locking plate 31 a side of the locking link 31. Accordingly, the operation unit link 32 rotates clockwise around the link shaft pin 29 as a fulcrum. At the same time, the drive shaft 32c of the operation unit link 32 slides from the front to the back while pressing the upper surface of the locking plate 31a downward, and further moves against the elastic return force of the coil springs 28, 28, 28. The frame 30 is pushed backward. As a result, the movable contacts 17, 17, 17 move downward, and the movable contact 17a
, 17a, 17a come into contact with the opposed fixed contacts 16a, 16a, 16a, respectively. And
As shown in FIG. 4A, the position of the axis of the link shaft pin 29 when viewed from the left side moves downward from a straight line connecting the axis of the shaft pin 19 and the axis of the drive shaft 32c. Then, the locking plate 31a
The rear end portion presses the upper end portion of the leg piece 5d of the latch means 5 downward, and the drive shaft 32c restricts the return of the movable frame 30 to the front. On the other hand, since the latch plate 5a is biased against the force applied to the locking plate 31a by the latch plate return spring 5b, the upper end portion of the leg piece 5d and the rear end portion of the locking plate 31a are locked. . By this locking, the lateral portion 11a of the operation portion 11 is held at a position that is substantially flush with the bottom surface of the concave portion 9, and the contact state of the three-pole contact portions 3, 3, and 3 is maintained. That is, the contact portions 3, 3, and 3 are in a closed state (on state), and power is supplied to the load.

On the contrary, when a force is manually applied to the horizontal portion 11a of the operation portion 11 in the direction of standing forward, the standing portion of the operation portion 11 as shown in FIG. 11 b rotates while being urged by the elastic return force of the operation portion return spring 34. Along with this, the operation unit link 3
2 rotates counterclockwise about the link shaft pin 29 as a fulcrum, and drives the drive shaft 32c of the operation unit link 32.
Slides from the rear to the front on the upper surface of the locking plate 31a. Then, the movable frame 3 whose restriction is released
0 moves forward together with the movable contacts 17, 17, 17 by the elastic return force of the coil springs 28, 28, 28. That is, the movable contacts 17a, 17a, 17a are fixed contacts 16a, 16a.
The contact portions 3, 3 and 3 are separated from a and 16a, and the contact portions 3, 3 and 3 are in an open state (off state), and power supply to the load is stopped. In the open state, the hooking portion 11d of the operation portion 11 abuts on the front end portion of the locking piece 31a, so that the rotation of the locking link 31 is restricted.

In this way, the circuit breaker 1 has the input terminal 2 by opening and closing the operation unit 11 from the outside of the body 2.
5, 25, 25 and contact points 3, 3, inserted in the main circuit between the output terminals 26, 26, 26
3 can be opened and closed.

In the above-described closed state, the input terminals 25, 25, 25 and the output terminals 26, 26,
When an overload current flows through the main circuit between the bimetal 6a and 26, as shown in FIG.
, 6a, 6a increase in heat generation, and the free ends 6b, 6b, 6b bend upward. With this displacement, the adjustment screws 21, 21, 21 press the front end portion of the latch plate 5a facing each other.
Then, the latch plate 5a rotates counterclockwise around the latch plate shaft pin 5c against the elastic return force of the latch plate return spring 5b, and the upper end portion of the leg piece 5d and the rear end portion of the locking plate 31a. Is released. Along with this, the locking link 31 receiving the downward force from the drive shaft 32c rotates counterclockwise together with the operation portion link 32, and the drive shaft 3 that restricted the movement of the movable frame 30.
2c moves downward. The restriction of the movable frame 30 is released, and the movable frame 30 moves forward together with the movable contacts 17, 17, 17 by the elastic return force of the coil springs 28, 28, 28. That is, the movable contacts 17a, 17a, 17a are fixed to the fixed contacts 16a, 16a without manually operating the operation unit 11.
A and 16a are separated from each other, and the contact portions 3, 3, and 3 are forcedly opened (trip state). In this way, the circuit breaker 1 has contact points 3, 3, 3 when an overload current flows in the main circuit.
Forcibly tripping the power supply to the load.

As shown in FIG. 4, a stepped portion in which the left and right ends are recessed rearward is formed at the front end of the center of the movable frame 30, and a shaft portion 30 b is further provided in the left-right direction. . When the movable frame 30 and the operation part link 32 rotate and move as described above, the shaft part 30b is connected to both leg pieces 32.
Since it slides on the peripheral surface of a and 32a, the opening / closing operation | movement of the contact parts 3, 3, and 3 is performed smoothly.

Next, the operation of the circuit breaker 1 of this embodiment will be described. Generally, the circuit breaker sets and confirms the operating characteristics of the tripping means during the manufacturing process at the factory. For example, it is necessary to adjust the operation time from when the overload current starts to flow until the bimetal is displaced and the contact portion is pulled off by screwing the adjustment screw relative to the opposing latch means. As described in the prior art, in the circuit breaker having the tripping means using the conventional bimetal, the screwing direction of the adjusting screw is parallel to the front surface of the body. For this reason, when the adjustment screw is screwed with a screwdriver or the like, the adjustment screw has to be screwed while maintaining the longitudinal direction of the driver in the parallel direction, resulting in poor workability. On the other hand, the free end 6b of the bimetal 6a of this embodiment is inclined upward, and the adjustment screw 21 is screwed together with the screw head thereof facing the front of the body body 2 along with this. Therefore, the tip of the driver can be inserted into the screw head from the front of the body 2 and the adjusting screw 21 can be screwed from the front to the rear while holding the longitudinal direction of the driver substantially in the front-rear direction. In addition, it is possible to easily perform the screwing operation of the adjusting screw at the time of adjusting the operation time for overload current tripping.

In this embodiment, the input terminals 25, 25, 25 are fixed contacts 16, 16, 16, and the output terminals 26, 26, 26 are movable contacts 17, 17, 17. The terminals 25, 25, 25 are used as movable contacts 17, 17, 17, and output terminals 26, 26, 2
Six sides may be fixed contacts 16, 16, 16. Moreover, the circuit breaker 1 of this embodiment is
Although the circuit breaker is a multipolar circuit breaker having three contact portions 3, the present invention is not limited thereto, and the contact portion 3 may be one pole.

It is sectional drawing of embodiment of this invention. The container in the same as above is shown, (a) is a perspective view and (b) is a front view. It is a disassembled perspective view of the opening-closing mechanism and latch means in the same as the above. It is a principal part left view in the same as the above, (a) shows the closing state of a contact part, (b) shows the opening state of a contact part, (c) shows the forced opening state of a contact part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Body 3 Contact part 4 Opening-closing mechanism 5 Latch means 6 Tripping means 6a Bimetal 6b Free end 6c Screw hole 8 Front 11 Operation part 21 Adjustment screw

Claims (1)

By opening / closing operation of the contact part inserted into the main circuit between the power source and the load, and the operation part exposed to the front of the instrument body and operable from the outside of the instrument body inside the container body forming the outer shell An opening / closing mechanism that opens and closes the contact portion; a latch means that engages with the opening / closing mechanism in a state of being biased against a force applied in a direction in which the contact portion opens; and when an overcurrent flows in a main circuit, A tripping means for releasing the locking and forcibly opening the contact portion,
The tripping means has one end fixed to the rear end face of the body and the other end penetrating the free end with a bimetal having a free end extending toward the front of the body. An adjustment screw that is screwed into the screw hole, and when the overload current flows through the main circuit, the free end is displaced, and the lock is released by pressing the latch means facing the adjustment screw. And
The circuit breaker according to claim 1, wherein the free end is inclined in a direction in which a screw head of the adjustment screw faces the front of the container body.

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