WO2014057517A1

WO2014057517A1 - Circuit breaker

Info

Publication number: WO2014057517A1
Application number: PCT/JP2012/006513
Authority: WO
Inventors: 和昌渡辺
Original assignee: 三菱電機株式会社
Priority date: 2012-10-11
Filing date: 2012-10-11
Publication date: 2014-04-17
Also published as: CN104025241A; CN104025241B; JP5549794B1; JPWO2014057517A1; KR20150020709A; KR101680492B1

Abstract

The present invention yields a circuit breaker in which the uniformity of design between a wiring circuit breaker and an earth leakage breaker is ensured, and a switching mechanism is shared. The present invention is provided with: a circuit interrupter (27) provided near both contacts; a cross bar (13) for rotatably holding a movable contactor (24); a lower link (39) for driving the cross bar (13); a lever (36) that engages with an overcurrent tripper (50) and rotates when tripping occurs; an upper link (37) supported by the lever (36) and joined to the lower link (39) via a spring pin (38); a main spring (40) in which a driven side is joined to the spring pin (38); a frame (32) fixed to a housing; a handle arm (33) rotatably supported by the frame (32) and joined to the driving side of the main spring (40); a sub-handle arm (34) rotatably supported by the frame (32) and joined to the handle arm (33); and a handle (31) mounted on the sub-handle arm (34).

Description

Circuit breaker

The present invention relates to a circuit breaker such as a circuit breaker for wiring or an earth leakage breaker, and more particularly to standardization and common use of a switching mechanism.

In circuit breakers, in actual use, it is common to install multiple models side by side, such as a circuit breaker and earth leakage circuit breaker, a low-priced product, and a high-performance product. Standardization of external dimensions is progressing. In addition, it is desirable to unify the product design, particularly the handle position for operation, among the models from the standpoint of appearance and mounting compatibility of attached devices.
However, the earth leakage circuit breaker requires a larger space, such as a zero-phase current transformer and electronic circuit unit, and the high-performance product, such as an additional contact pair that supports high breaking capacity. It is necessary to decide the internal layout based on the larger model.
Therefore, after unifying the outer dimensions of the mold case to the same dimensions as the mold case of the earth leakage breaker of the same frame as the wiring breaker, the depth dimension of the connection conductor extending from the load side terminal to the inside of the case Shorter than the connection conductor of the load side terminal applied to the earth leakage circuit breaker, and the installation position of the overcurrent trip device and switching mechanism was moved closer to the load side terminal accordingly, and the space occupied by the arc extinguishing device was expanded. A circuit breaker for wiring is known (for example, see Patent Document 1).

JP 2004-273339 A

As described above, in the conventional circuit breaker, the length of the connecting conductor that connects the load side terminal and the overcurrent trip device is shortened, and the installation position of the overcurrent trip device and the switching mechanism is adjusted accordingly. Since the position of the operation handle is moved closer to the load side terminal, the compatibility of the accessory device is impaired.
Further, Patent Document 1 discloses that the position where the knob portion is raised in the operation handle is changed so that the position of the knob portion is relatively the same, but the operation handle cannot be shared. In addition to the problem, if the amount of movement of the opening / closing mechanism toward the load side terminal becomes large, the movement amount of the corresponding opening / closing mechanism cannot be secured by changing the standing position of the knob portion. Furthermore, since the center of rotation when the operation handle is turned ON / OFF is shifted by the movement of the opening / closing mechanism, there is a problem that the operation handle cannot be turned ON / OFF smoothly.

The present invention has been made to solve the above-described problems, and can ensure the uniformity of the design of the circuit breaker for wiring and the earth leakage circuit breaker and can share the switching mechanism. Get a circuit breaker.

In the circuit breaker according to the present invention, a movable contact having a movable contact at one or both ends, a fixed contact contacting and separating from the movable contact, a rotor holding the movable contact and pivotally supported freely, Lower link that drives the rotor, lever that is engaged with the latch of the tripping device and rotates when tripped, upper link that is pivotally supported by this lever and connected to the lower link via a spring pin, and forms a toggle link A circuit breaker comprising a main spring having a driven side 40b coupled to a spring pin and a handle arm coupled to a driving side 40a of the main spring and pivotally supported on a fixed frame. A sub handle arm pivotally supported on the frame at a point different from a pivot point of the handle arm is provided, and the sub handle arm and the above Combining Ndoruamu a link member, it is obtained by mounting the handle to the sub-handle arm.

According to the present invention, the sub handle arm pivotally supported on the frame by the fulcrum provided on the arc extinguishing device side from the shaft fulcrum of the handle arm is provided, and the handle is attached to the sub handle arm. It is possible to ensure the uniformity of the design of the circuit breaker for wiring and the earth leakage circuit breaker and to share the switching mechanism.

It is side surface sectional drawing which shows the ON state of the circuit breaker for wiring in Embodiment 1 of this invention. It is front sectional drawing which shows the trip state of the circuit breaker for wiring in Embodiment 1 of this invention. It is an exploded view which shows the switching mechanism part of the circuit breaker for wiring in Embodiment 1 of this invention. It is a side view which shows the lever of the circuit breaker for wiring in Embodiment 1 of this invention. It is side surface sectional drawing which shows the OFF state of the circuit breaker for wiring in Embodiment 1 of this invention. It is side surface sectional drawing which shows the trip state of the circuit breaker for wiring in Embodiment 1 of this invention. It is an exploded view which shows the switching mechanism part of the earth-leakage circuit breaker in Embodiment 2 of this invention. It is front sectional drawing which shows the trip state of the earth leakage circuit breaker in Embodiment 2 of this invention. It is side surface sectional drawing which shows the ON state of the earth-leakage circuit breaker in Embodiment 2 of this invention. It is side surface sectional drawing which shows the OFF state of the earth-leakage circuit breaker in Embodiment 2 of this invention. It is side surface sectional drawing which shows the trip state of the earth leakage circuit breaker in Embodiment 2 of this invention.

Embodiment 1 FIG.
1 to 6 show a circuit breaker in the present embodiment. 1 is a side cross-sectional view showing an on state, FIG. 2 is a front cross-sectional view showing an on state, FIG. 3 is an exploded view showing the main part of the opening and closing mechanism, (a) is a side view, (b) is a front view, 4A and 4B are views showing a lever of the opening / closing mechanism, wherein FIG. 4A is a perspective view, FIG. 4B is a side view, FIG. 5 is a side sectional view showing an off state, and FIG.

In FIG. 1, a circuit breaker 101 is configured using a housing 10 that includes a base 11 and a cover 12 formed of an insulating material. On the base 11, circuit breaker units for each phase (for example, three in the case of three phases) connected to the electric circuit are arranged in parallel with each other, and a well-known toggle is placed above the central circuit breaker unit. An opening / closing mechanism unit 30 having a link mechanism is disposed.

The cover 12 covers the circuit breaker unit of each phase on the base 11 and the opening / closing mechanism 30, and the operation handle 31 of the opening / closing mechanism 30 projects from the cover 12. The cover 12 is provided with an upper cover 12 a that can be opened and closed so that an internal accessory device can be disposed inside the circuit breaker 101.
The circuit breaker units for each phase are configured in the same manner, and the crossbar 13 is arranged on the base 11 so as to be orthogonal to the circuit breaker units for each phase in common with the circuit breaker units for each phase. The

Each circuit breaker unit of each phase includes a power supply side terminal 20 provided on the base 11, a fixed contact 22 provided on a fixed contact 21 extending from the power supply side terminal 20, and a contact with the fixed contact 22. A movable contact 23 to be separated, a movable contact 24 provided at one end and rotatably held by the crossbar 13, and a movable contact holder 25 connected to the movable contact 24. And an overcurrent tripping device 50 and a load side terminal 26 connected to the overcurrent tripping device 50 and provided on the base 11. The fixed contact 22 and the movable contact 23 constitute an open / close contact that opens and closes the electric circuit. An arc extinguishing device 27 is provided in the vicinity of the fixed contact 22 and the movable contact 23. If the movable contact 23 comes into contact with the fixed contact 22, the electrical circuit between the

terminals

20 and 26 is turned on. If the movable contact 23 is separated from the fixed contact 22, the electrical circuit between the

terminals

20 and 26. Is turned off.

The crossbar 13 is rotated around its axis 13a by the opening / closing mechanism 30 and the movable contact 24 in each circuit breaker unit of each phase is attached. When the cross bar 13 rotates about its axis 13 a, the movable contact 24 of each circuit breaker unit of each phase is simultaneously rotated, and the movable contact 23 is fixed by the rotation of the movable contact 24. The contact 22 contacts and leaves.
Further, the overcurrent tripping device 50 includes a well-known relay unit 51 that detects an overcurrent and a short circuit current, a trip bar 52 that is driven by the relay unit 51, and the trip bar 52 that is attached clockwise in the drawing. The latch spring 53 is energized, and the latch 54 is prevented from rotating counterclockwise by the trip bar 52.

Next, the configuration of the opening / closing mechanism 30 which is a main part of the present invention will be described. As shown in FIGS. 1 and 2, the opening / closing mechanism 30 is fixed to the base 11, and is provided inside a frame 32 formed by a pair of opposed frame plates 32 </ b> A and 32 </ b> B. The handle arm pivot center 32 a provided on the handle arm 33 is pivotally supported by the handle arm rotation center 33 a so that the handle arm rotation center 33 a is freely pivoted. The handle arm 33 is provided on the outer side of the frame 32. The sub handle arm rotation center 34a provided on the sub handle arm 34 is rotatably supported by the sub handle arm shaft support portion 32b of the frame 32, and is driven by the slide groove 34b provided on the sub handle arm 34. A slide pin 35 for connecting the sub handle arm 34 and the handle arm 33, that is, , A link member, the operating handle 31 mounted on the sub-handle arm 34, it is unitized. Since the sub handle arm shaft support portion 32b of the frame 32 is provided outside the frame 32, it does not interfere with the handle arm rotation center 33a.

Further, inside the handle arm 33, a lever 36 that is locked to the latch 54 of the overcurrent tripping device 50 and is pivotally supported by the lever pivotal support portion 32c of the frame 32 by the first rotating shaft portion 36a, and this The upper link 37 pivotally supported by the lever 36 is supported by the upper link 37, and the upper link 37 and the spring pin 38 are engaged with each other to form a toggle link. The lower link 39 rotates the cross bar 13. And a pair of main springs 40 each having a driven side 40b stretched around the spring pin 38 and a drive side 40a stretched around the slide pin 35.
The “holding member” described in the claims is the cross bar 13 described above, and the “link member” is the slide pin 35 described above.

The handle arm 33 has both arms, that is, an end portion 33a formed in an arc shape on the U-shaped side surface, on the handle arm shaft support portion 32a of the arc-shaped recess provided in the frame 32 by the force of the main spring 40. While being pressed, it is formed in a substantially U shape so that its turning locus is substantially flush with the inner surfaces of the

frame plates

32A, 32B of the frame 32.
The sub handle arm 34 also includes a sub handle arm having a circular arc recess provided on the outer side of the frame 32. The sub handle arm rotation center 34a, which is an end portion of the U-shaped side surface formed in an arc shape. While being pressed against the shaft support portion 32b by the force of the main spring 40, it is formed in a substantially U shape so that its turning locus is substantially flush with the outer surfaces of the

frame plates

32A and 32B of the frame 32.

On the other hand, as shown in FIG. 3, the lever 36 is formed in a substantially U-shape so that both arms can be rotated between the

frame plates

32A and 32B. The first rotation shaft portion 36 a extending outward substantially parallel to the portion corresponding to is supported by a shaft hole 32 c provided in the frame 32.

The upper link 37 has a gap formed between the frame 32 and the lever 36 by pivotally attaching the first arcuate recess 37a to the second shaft portion 36c protruding from the side surface of the lever 36. Although the rotation is performed, the gap corresponds to the width of the projecting portion 32c1 in which the shaft hole 32c is obtained by so-called burring. In the ON state, the first rotation shaft portion 36a is pressed against the projecting portion 32c1 by the force of the main spring 40. The upper link 37 also has a third arcuate recess, and the third arcuate recess and the first hole 39a of the lower link 39 are pivotally and pivotally attached to the spring pin 38, respectively. As described above, the upper link 37 and the lower link 39 are connected via the spring pin 38 as a skeleton of a so-called toggle link mechanism. Furthermore, the second hole 39b is pivotally attached to a crossbar pin disposed in the crossbar 13, whereby the lower link 39 and the crossbar 13 are connected. In this embodiment, the upper link 37 is substantially U-shaped like the handle arm 33 and the lever 36, and the lower link 39 is formed in a pair of opposing plates like the frame 32, respectively. Needless to say, it is not limited to this shape.

Next, the operation of the circuit breaker 101 will be described.
First, the manual operation from on to off will be described.
As shown in FIG. 1, when the operation handle 31 is operated, the combined sub handle arm 34 rotates counterclockwise about the sub handle arm rotation center 34a. At this time, the slide pin 35 is driven by the slide groove 34b. The handle arm 3 and the main spring 40 are coupled to the slide pin 35, and the handle arm 33 rotates counterclockwise about the handle arm rotation center 33a. In accordance with the movement of the slide pin 35, the drive side 40a of the main spring 40 passes through the first hole 39a of the upper link 37 around the driven side 40b coupled to the spring pin 40. At this time, the upper link 37 urged counterclockwise around the link support shaft 37 a by the main spring 40 via the spring pin 38 is urged clockwise by the movement of the drive side 40 a of the main spring 40. It starts to turn. By the rotation of the upper link 37, the first hole 39a of the lower link 39 coupled via the spring pin 38 is lifted. As the second hole 39b of the lower link 39 is also lifted, the cross bar 13 coupled thereto is rotated counterclockwise, and the movable contact 24 is rotated. In accordance with this rotation, the movable contact 23 is separated from the fixed contact 22 to be turned off as shown in FIG.

Next, the manual operation from OFF to ON will be described.
In FIG. 5, when the handle 31 is operated, the combined sub handle arm 34 rotates clockwise about the sub handle arm rotation center 34a. At this time, the slide pin 35 is driven by the slide groove 34b. A handle arm 33 and a main spring 40 are coupled to the slide pin 35, and the handle arm 33 rotates clockwise about the handle arm rotation center 33a. As the slide pin 35 moves, the drive side 40a of the main spring 40 passes through the link support shaft 37a of the upper link 37 with the driven side 40b coupled to the spring pin 38 as the center.

At this time, the upper link 37 urged clockwise around the link support shaft 37 a by the main spring 40 via the spring pin 38 is urged counterclockwise by the movement of the drive side 40 a of the main spring 40. Then, the rotation starts. By the rotation of the upper link 37, the first hole 39a of the lower link 39 coupled via the spring pin 38 is pushed down. As the second hole 39b of the lower link 39 is also lowered, the cross bar 13 coupled thereto is rotated clockwise, and the movable contact 24 is rotated. As the movable contact 23 comes into contact with the fixed contact 22 according to this rotation, the on state shown in FIG.

Next, the trip operation will be described.
In FIG. 1, when both

terminals

20 and 26 are in an overcurrent state due to an abnormality in the electric circuit or the like, the relay unit 51 is operated, and the trip bar 52 is pushed to rotate counterclockwise. At this time, the rotation of the latch 54 is not restrained, and the latch 54 starts to rotate counterclockwise. Next, the lever engaging portion 36b of the lever 36 becomes free to rotate, and the clockwise rotation about the first rotation shaft portion 36a is started. Along with this rotation, the link support shaft 37a of the upper link 37 also moves, but when passing through the axis of the main spring 40, a biasing force in the clockwise direction is generated from the spring pin 38 to the upper link 37, When the lower link 39 is lifted via the spring pin 38, the cross bar 13 and the movable contact 24 are sequentially operated, and the movable contact 23 is separated from the fixed contact 22, so that the trip state shown in FIG.

From the trip state shown in FIG. 6, by moving the handle 31 counterclockwise, the sub handle arm 34 rotates the handle arm 33 via the slide pin 35, and the lever 36 is counterclockwise by the lever engaging portion 36b. In order to return clockwise, the OFF state shown in FIG. 5 is entered.

According to the present embodiment, the sub handle arm 34 pivotally supported by the frame 32 by the sub handle arm shaft support portion 32b provided on the arc extinguishing device 27 side from the handle arm rotation center 33a of the handle arm 33 is provided. Since the handle 31 is mounted on the sub handle arm 34, the design uniformity with the circuit breaker for wiring and the earth leakage circuit breaker can be ensured, and the opening / closing mechanism 30 can be shared.

In addition, since the handle 31 includes the handle arm fixing portion 31a and the sub handle arm fixing portion 31b, the earth leakage breaker can be configured with the same handle as that in the case where the circuit breaker is configured.

Further, a sub handle arm 34 pivotally supported on the frame 32 by a sub handle arm shaft support portion 32b provided on the arc extinguishing device 27 side from the handle arm rotation center 33a of the handle arm 33 is provided. Since the handle 31 is attached to 34, the mounting position of the cross bar 13, the movable contact 24, and the fixed contact 21 can be moved closer to the load side terminal to increase the space occupied by the arc extinguishing device, thereby improving the shut-off performance. can do.

Further, since the sub handle arm 34 is detachably connected to the slide groove 34b provided in the handle arm 33 by the slide pin 35, an earth leakage breaker can be easily configured.

Further, since the sub handle arm 34 is pivotally supported by the sub handle arm shaft support portion 32b and is provided outside the frame 32, the sub handle arm 34 can be removed without disassembling the handle 31. Further, since the fixing portions 31a and 31b of the sub handle arm 34 and the fixing portions 31c and 31d of the handle arm 33 are provided side by side with the handle 31, the handle 31 can correspond to both specifications, and the standardization of parts is further promoted. be able to.

In addition, since the link member that connects the sub handle arm 34 and the handle arm 33 is a cylindrical pin like the slide pin 3 and the sub handle arm 34 is connected via the slide groove 34b, the shape of the parts is simplified. And the number of parts can be reduced.

Further, since the hook portion of the main spring 40 is directly engaged with the slide pin 35, the top surface shape of the handle arm 33 is simplified and the slidability of the engaging portion of the main spring 40 is improved, and the durability of the opening / closing mechanism portion is improved. Can increase the sex.

In this embodiment, an example of a one-point circuit breaker having a movable contact at one end of the movable contact is shown. However, a two-point circuit breaker having a movable contact at both ends of the movable contact is shown. Even if the sub handle arm is provided and the operation handle is provided on the sub handle arm, the same effect can be obtained.

Embodiment 2. FIG.
In the first embodiment, the case where the circuit breaker for wiring is configured has been described, but in the present embodiment, the case where the circuit breaker for earth leakage is configured by removing the sub handle arm and the slide pin will be described.
7 to 11 show a circuit breaker which is a leakage breaker in the present embodiment. 7 is a side sectional view showing the ON state, FIG. 8 is a front sectional view showing the ON state, FIG. 9 is an exploded view showing the main part of the opening and closing mechanism, (a) is a side view, (b) is a front view, FIG. 10 is a side sectional view showing an off state, and FIG. 11 is a side sectional view showing a trip state.

7, 10, and 11 correspond to FIGS. 1, 5, and 6, respectively.
As shown in FIGS. 8 and 9, the earth leakage breaker 102 according to the present embodiment removes the sub handle arm 34 and the slide pin 35 from the circuit breaker 101 described in the first embodiment, and directly attaches to the handle arm 33. The handle 31 is mounted, and the crossbar 13, the fixed contact 21, the movable contact 24, and the overcurrent trip are set by the difference in the horizontal distance between the position where the sub handle arm rotation center 34a is located and the handle arm rotation center 33a. The device 50 is moved to the power source side (right side on the paper surface), and a zero-phase current transformer or the like is placed in the empty space (difference between the A size in FIG. 7 and the B size in FIG. 1) on the load side (left side on the paper surface). The leakage detection related component 60 is arranged. Since the operations in the respective states of FIGS. 7, 10, and 11 are the same as those in the first embodiment except that the handle arm 33 is driven from the handle 31, the description thereof is omitted.

In FIG. 7, a circuit breaker 102 is connected to a zero-phase current transformer 60a that detects a leakage current of an AC circuit, and to this zero-phase current transformer 60a, and an overcurrent according to an output signal of the zero-phase current transformer 60a. Leakage detection device 60b for driving tripping device 50, movable contact 24 having movable contact 23 at one end, fixed contact 22 contacting and moving away from movable contact 23, and both

contacts

22 and 23 are provided in the vicinity. An arc extinguishing device 27, a crossbar 13 that is a holding member that holds the movable contact 24 and is pivotally supported, a lower link 39 that drives the crossbar 13, and an overcurrent tripping device 50 A lever 36 that is engaged with the latch 54 and rotates when tripped, an upper link 37 that is pivotally supported by the lever 36 and coupled to the lower link 39 via a spring pin 38, and a driven side 40b of the spring pin 38 are coupled. The main spring 40, the frame 32 fixed to the casing of the circuit breaker 102, and the driving side 40a of the main spring 40 are coupled to the main spring 40 and freely pivoted by a first shaft fulcrum 33a provided on the frame 32. A supported handle arm 33 and a handle 31 mounted on the handle arm 33 are provided.

As shown in FIG. 9, the frame 32 has a second pivot point 32b provided on the arc extinguishing device 27 side from the first pivot point.
In this embodiment, an example of a one-point circuit breaker having a movable contact at one end of the movable contact is shown. However, a two-point circuit breaker having a movable contact at both ends of the movable contact is shown. Is also applicable.

Next, the operation of the circuit breaker 102 will be described.
First, the manual operation from on to off will be described.
As shown in FIG. 7, when the operation handle 31 is operated, the combined handle arm 33 rotates counterclockwise about the handle arm rotation center 33a. The handle arm 33 and the drive side 40a of the main spring 40 are coupled to each other. The main spring 40 has the driven side 40a centered on the driven side 40b coupled to the spring pin 40, and the drive side 40a passes through the first hole 39a of the upper link 37. pass. At this time, the upper link 37 urged counterclockwise around the link support shaft 37 a by the main spring 40 via the spring pin 38 is urged clockwise by the movement of the drive side 40 a of the main spring 40. It starts to turn. By the rotation of the upper link 37, the first hole 39a of the lower link 39 coupled via the spring pin 38 is lifted. As the second hole 39b of the lower link 39 is also lifted, the cross bar 13 coupled thereto is rotated counterclockwise, and the movable contact 24 is rotated. In accordance with this rotation, the movable contact 23 is separated from the fixed contact 22 to be turned off as shown in FIG.

Next, the manual operation from OFF to ON will be described.
In FIG. 10, when the handle 31 is operated, the combined handle arm 33 rotates clockwise around the handle arm rotation center 33a. As the handle arm 33 rotates, the drive side 40a of the main spring 40 passes through the link support shaft 37a of the upper link 37 around the driven side 40b coupled to the spring pin 38.

Next, the trip operation will be described.
In FIG. 7, when the relay section 51 operates due to an overcurrent state between the

terminals

20 and 26 due to an abnormality in the electric circuit or the like, or the leakage current is detected by the zero-phase current transformer 60a and the leakage detection device 60b is activated, a trip occurs. The bar 52 is pushed and rotates counterclockwise. At this time, the rotation of the latch 54 is not restrained, and the latch 54 starts to rotate counterclockwise. Next, the lever engaging portion 36b of the lever 36 becomes free to rotate, and the clockwise rotation about the first rotation shaft portion 36a is started. Along with this rotation, the link support shaft 37a of the upper link 37 also moves, but when passing through the axis of the main spring 40, a biasing force in the clockwise direction is generated from the spring pin 38 to the upper link 37, When the lower link 39 is lifted via the spring pin 38, the cross bar 13 and the movable contact 24 are sequentially operated, and the movable contact 23 is separated from the fixed contact 22, so that the trip state shown in FIG.

From the trip state shown in FIG. 11, the handle arm 33 is rotated by moving the handle 31 counterclockwise, and the lever 36 is returned counterclockwise by the lever engaging portion 36b. Therefore, the off state shown in FIG. It becomes.

According to the earth leakage breaker of the present embodiment, the sub handle arm shaft support portion 32b provided on the arc extinguishing device 27 side from the handle arm rotation center 33a is provided on the frame 32, and the handle 31 is attached to the handle arm 33. The design uniformity with the circuit breaker for wiring and the earth leakage circuit breaker can be ensured, and the switching mechanism 30 can be shared.

Further, since the frame 32 has a sub handle arm shaft support portion 32b provided on the arc extinguishing device 27 side from the handle arm rotation center 33a that is a shaft fulcrum of the handle arm 33, a sub handle arm 34 and a slide pin 35 are added. Thereby, a mechanism component can be moved to the anti-arcing device 27 side, and generation | occurrence | production of an empty space can be suppressed. A larger arc extinguishing grid 27 as shown in FIG. 1 can be employed.

In the above description, the circuit breaker has been described. However, it is natural that this type of switch can be used in general, and even if minor changes are made, it does not depart from the scope of the invention.

13 Crossbar,
22 fixed contacts,
23 movable contacts,
24 movable contacts,
25 Movable element holder 27 Arc extinguishing device,
31 handle,
32 frames,
32a Handle arm shaft support portion 32b Sub handle arm shaft support portion 33 Handle arm,
33a Center of rotation of handle arm,
34 Sub handle arm,
34a Sub handle arm rotation center 34b Slide groove 35 Slide pin,
36 levers,
37 Top link,
37a Link support shaft 38 Spring pin,
39 Down link,
39a first hole,
39b second hole,
40 Main spring,
50 Overcurrent trip device 51 Relay section,
52 Trip bar,
53 Latch spring 54 Latch,
60 Electric leakage detection related parts,
101 Circuit breaker.

Claims

A movable contact having a movable contact at one end or both ends, a fixed contact contacting and moving away from the movable contact, an arc extinguishing device provided in the vicinity of both the contacts, and holding the movable contact so as to freely rotate. A holding member that is pivotally supported, a lower link that drives the holding member, a lever that is engaged with a latch of an overcurrent tripping device and that rotates when tripped, and a pivot pin that is pivotally supported by the lever and is attached to the lower link An upper link coupled via a main pin, a main spring coupled on the driven side of the spring pin, a frame fixed to the casing of the circuit breaker, and a drive side of the main spring, provided on the frame A handle arm that is pivotally supported by a first pivot point that is formed, and a sub-hand that is coupled to the handle arm and pivotally supported by a second pivot point provided on the frame. Circuit breaker characterized by comprising an arm, a handle this is mounted on the sub-handle arm, the.
The circuit breaker according to claim 1, wherein the second shaft fulcrum is provided closer to the arc extinguishing device than the first shaft fulcrum.
The circuit breaker according to claim 2, wherein a link member that removably connects the sub handle arm to the handle arm, and the handle includes a handle arm fixing portion and a sub handle arm fixing portion.
4. The circuit breaker according to claim 2, wherein the sub handle arm includes a slide groove that movably connects the handle arm with the link member. 5.
The circuit breaker according to claim 4, wherein the link member is coupled to a drive side of the main spring, and the main spring and the handle arm are coupled via the link member.
A zero-phase current transformer for detecting a leakage current of an electric circuit, a leakage detector connected to the zero-phase current transformer, and driving the overcurrent tripping device according to an output signal of the zero-phase current transformer; Alternatively, a movable contact having movable contacts at both ends, a fixed contact that is in contact with and away from the movable contact, an arc extinguishing device provided in the vicinity of both the contacts, and the movable contact are held and freely pivoted. A supported holding member, a lower link that drives the holding member, a lever that is engaged with a latch of the overcurrent tripping device and that rotates when tripped, and is pivotally supported by the lever, and a spring pin on the lower link An upper link coupled via a main pin, a main spring coupled on the driven side of the spring pin, a frame fixed to the casing of the circuit breaker, and a drive side of the main spring, provided on the frame First pivot point Includes more rotation and freely axially supported by the handle arm, and a handle attached to the handle arm,
The circuit breaker according to claim 1, wherein the frame has a second pivot point provided closer to the arc extinguishing device than the first pivot point.