JP4143166B2 - Circuit breaker switching mechanism - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a contact opening / closing mechanism such as a push button type earth leakage circuit breaker that pulls up a movable contact to contact a fixed contact.
[0002]
[Prior art]
As the contact opening / closing mechanism as described above, for example, a contact opening / closing mechanism as shown in Japanese Patent Application No. 9-98539 has been used. In FIG. 1 of the same application, the movable contacts 5 and 5 ′ are lifted by the springs 14 with respect to the downward fixed contacts 4 and 4 ′ via the reset member 10, the actuating member 12, and the crossbar member 13 engaged with the actuating member 12. In order to turn the contact OFF from the state of FIG. 1, the bimetal 18, 18 ′ detects an overcurrent and releases the engagement of the actuating member 12 and the crossbar member 13. The electromagnet device 17 connected to the leakage detector 16 is driven to release the engagement between the actuating member 12 and the crossbar member 13, and the contacts 5, 5 ′ are driven by the self-biased movable contact plates 6, 6 ′. , 4 ′.
[0003]
[Prior art issues]
However, in the conventional contact opening / closing mechanism as described above, the reset member 10 and the reset button 9 are directly connected, and the reset button 9 is touched with a finger while the contacts 4, 4 'and 5, 5' are in contact with each other. When pressed, there are problems such as a decrease in contact pressure between the contacts, or the contacts 4, 4 ′ and 5, 5 ′ moving away to temporarily turn off.
[0004]
In addition, when the engagement between the crossbar member 13 and the actuating member 12 is released and the contact is turned off, the engagement is restored by pressing the reset button 9 to restore the engagement and turn the contact on. It was necessary to release the button 9, but the speed at which the contacts 5, 5 'contact the contacts 4, 4' depends on the speed at which the button 9 is released. Then, there were problems such as rough contact surfaces.
[0005]
OBJECT OF THE INVENTION
Thus, in the present invention, in the push button type lever lifting type contact opening / closing mechanism as described above, even if the button is pressed while the contact is ON, the contact is not temporarily turned OFF. By pressing a button, the contact can be reliably turned on, and the contact contact speed is intended to provide a contact opening / closing mechanism that does not depend on the speed at which the button is released.
[0006]
[Means for achieving the objectives]
The invention of claim 1 is arranged in a case composed of the base 1 and the cover 2, and is opposed to the fixed contact 17, the fixed contact plate 18 fixed to the case by fixing the fixed contact 17, and the fixed contact 17. The movable contact 16 that is disposed and contacts and is separated from the fixed contact 17, the movable contact plate 15 that is fixed and is constantly biased away from the fixed contact 17, and the movable contact 16 contacts the fixed contact 17. The cross bar 14 that supports the movable contact plate 15 in the contact direction and slides in the groove 101 of the case in the contact / separation direction of the movable contact 16, and the movable contact 16 is urged in the direction to contact the fixed contact 17 and the case groove. 102, a crossbar pulling member 7 that slides within 102, an engagement means that engages and disengages the crossbar 14 and the crossbar pulling member 7, and is always elastically biased in the engaging direction, and the position of the crossbar. By crossbar When the contact bar 14 is in the contact ON position, the cross bar pulling member 7 is not engaged, and when the cross bar 14 is in the contact OFF position, contact closing means for engaging the cross bar lifting member 7 is provided. A compression spring 6 is provided between the contact input means and the crossbar lifting member 7, and contact release means for releasing the engagement between the engagement means and the crossbar 14 and opening the contacts 16 and 17 is provided. This is a contact opening / closing mechanism.
[0007]
The invention of claim 2 is arranged in a case composed of the base 1 and the cover 2 and is opposed to the fixed contact 17, the fixed contact plate 18 fixed to the case by fixing the fixed contact 17, and the fixed contact 17. The movable contact 16 that is disposed and contacts and is separated from the fixed contact 17, the movable contact plate 15 that is fixed and is constantly biased away from the fixed contact 17, and the movable contact 16 contacts the fixed contact 17. The cross bar 20 that supports the movable contact plate 15 in the contact direction and slides in the groove 101 of the case in the contact / separation direction of the movable contact 16, and the movable contact 16 is urged in the direction in contact with the fixed contact 17 and the case groove A crossbar lifting member 19 that slides in the inside 102, and an engagement portion 1002 that is pivotally supported by the crossbar lifting member 19 and that is separated from the pivotal support portion with the crossbar 20, are always provided. Crossbar When the cross bar 20 is in the contact ON position, the cross bar 14 is not engaged with the cross bar pulling member 7 when the cross bar 20 is in the contact ON position. When in the OFF position, contact closing means for engaging in a direction to hold down the crossbar pulling member is provided, and a compression spring 6 is provided between the contact charging means 1 and the crossbar pulling member 19, and the engaging means 10 The contact opening / closing mechanism includes contact release means for releasing the engagement of the cross bar 14 and opening the contacts 16 and 17.
[0008]
The invention of claim 3 is arranged in a case comprising the base 1 and the cover 2, and is opposed to the fixed contact 17, the fixed contact plate 18 fixed to the case by fixing the fixed contact 17, and the fixed contact 17. The movable contact 16 that is disposed and contacts and is separated from the fixed contact 17, the movable contact plate 15 that is fixed and is constantly biased away from the fixed contact 17, and the movable contact 16 contacts the fixed contact 17. A cross bar 23 that supports the movable contact plate 15 in the contact direction and slides in the groove 101 of the case in the contact / separation direction of the movable contact 16, and is biased in a direction in which the movable contact 16 contacts the fixed contact 17 and the case groove. The crossbar pulling member 22 that slides in the inside 102 and the crossbar 23 rotate around a support portion 2301 with the movable contact plate 15, and the crossbar is pulled away from the rotation center. Up Includes an engagement portion 2302 of the member 22, the engaging portion 2302 always elastically biased to the side for engagement with the cross bar pulling member 22, the position of the crossbar in contact ON and OFF, the cross bar 23 is When the contact is in the ON position, the cross bar pull-up member 22 is not engaged, and when the cross bar 23 is in the contact OFF position, the contact input means is provided to engage the cross bar pull-up member 22 in the direction of restraining. A compression spring 6 is provided between the means and the crossbar pulling member 22, and contact releasing means for releasing the engagement between the crossbar pulling member 22 and the crossbar 23 and opening the contacts 16 and 17 is provided. It is a contact opening and closing mechanism characterized by the above.
[0009]
The invention of claim 4 is arranged in a case comprising the base 1 and the cover 2, and is opposed to the fixed contact 17, the fixed contact plate 18 fixed to the case by fixing the fixed contact 17, and the fixed contact 17. The movable contact 16 that is disposed and contacts and is separated from the fixed contact 17, the movable contact plate 15 that is fixed and is constantly biased away from the fixed contact 17, and the movable contact 16 contacts the fixed contact 17. A cross bar 25 that supports the movable contact plate 15 in the contact direction and slides in the groove 101 of the case in the contact / separation direction of the movable contact 16, and is biased in a direction in which the movable contact 16 contacts the fixed contact 17 and the case groove. A crossbar pulling member 22 that slides in the inside 102 and a pivot shaft supported by the crossbar 25, and an engagement portion 2601 with the crossbar pulling member 22 is provided at a position away from the pivot support portion. 2601 is always An engaging member 26 that is cross-bar pulling member 22 and the elastic biasing on the side to be engaged, the position of the crossbar in contact ON and OFF, crossbar pulling member when the crossbar 25 is in contact ON position 22 When the cross bar 25 is in the contact OFF position without being engaged, contact contact means for engaging in a direction to suppress the cross bar pulling member 22 is provided, and between the contact throwing means and the cross bar pulling member 22 is compressed. A contact opening / closing mechanism including a spring 6 and contact release means for releasing the engagement between the crossbar pulling member 22 and the engagement member 26 and opening the contacts 16 and 17.
[0010]
According to a fifth aspect of the present invention, the contact input means includes the engaging member 5 and the button member 3 that is operated by pressing with a finger. The engaging member 5 is separated from the shaft support portion 502 and the shaft support portion 502. A cam portion 505 and an engagement portion 506 are provided at positions, and the shaft support portion 502 of the engagement member 5 is pivotally supported by the button member 3 so that the engagement portion 506 is always on the crossbar lifting member side. When the cam portion 505 is linked to the crossbar and the crossbar is in the contact ON position, the engaging member 5 is lifted by the engaging portion 506 around the shaft support portion 502. When the engagement is released from the member and the cross bar is in the contact OFF position, the engaging portion 506 is engaged with the cross bar lifting member by urging, and the button member 3 is moved by the guide portion 103 of the case. The sliding direction is regulated by the sliding direction. Claims 1, characterized in that a contact switching mechanism according to any one of 4.
[0011]
The invention according to claim 6 is the contact opening / closing mechanism according to any one of claims 1 to 5, wherein the contact opening means is a manual opening means by a release button 3201 and a lever 3202. .
[0012]
The invention according to claim 7 is the contact opening / closing mechanism according to any one of claims 1 to 5, characterized in that the contact opening means is a bimetal overcurrent detection means.
[0013]
The contact opening / closing mechanism according to any one of claims 1 to 5, characterized in that the contact opening means is a leakage detector and an electromagnet device connected to the leakage detector. It is.
[0014]
The invention of claim 9, wherein, contact opening means, claim 6, claim 7, characterized in that it is a combination of claims 8 appropriately, any one of claims 1 to 5 This is a contact opening / closing mechanism.
[0015]
[Action]
According to the first to fourth aspects of the present invention, the contact input means is configured not to engage the crossbar lifting member when the crossbar is in the contact ON position. Does not change, the contact is not temporarily turned off, and when the crossbar is in the OFF position, it engages in a direction to hold down the crossbar lifting member. It is possible to obtain a contact opening / closing mechanism that reliably turns the contact ON when the crossbar engaging means is restored and the button is released.
[0016]
The invention of claim 5 provides a specific configuration of the contact input means. By using the contact input means of claim 5, in the process from contact OFF to contact ON, the contact input means and the crossbar lifting member The contact speed of the contacts can always be made constant by relying on the urging force of the crossbar lifting member regardless of the speed at which the button member is released with the finger.
[0017]
The inventions of claims 6 to 9 are embodiments of the contact opening means of the inventions of claims 1 to 4.
[0018]
[Explanation of Examples]
FIG. 1 is a diagram of an embodiment of claim 1 of the present invention. In FIG. 1, reference numeral 17 denotes a fixed contact, which is fixed to a fixed contact plate 18, and the fixed contact plate 18 is fixed to a case composed of a base 1 and a cover 2. Reference numeral 16 denotes a movable contact that faces the fixed contact 17 and is fixed to the movable contact plate 15. The base is fixed to the case, and is formed of an elastic plate material in the illustrated example. It is urged in a direction away from 17.
[0019]
A cross bar 14 supports the movable contact plate 15 from the direction in which the contact 16 contacts the contact 17, and slides in the groove 101 of the case provided in the direction in which the movable contact 16 contacts and separates from the fixed contact 17.
[0020]
Reference numeral 7 denotes a crossbar lifting member that slides in the groove 102 of the case that is the same as the sliding direction of the crossbar 14 and is biased by the spring 8 in the direction in which the contact 16 contacts the contact 17. Thus, the engaging means engages and disengages between the crossbar lifting member 7 and the crossbar 14 according to the state of the contact releasing means of FIG. When the engaging means is in the engaged state, the cross bar 14 is lifted by the cross bar lifting member 7 by the urging force of the spring 8, and the movable contact plate 15 is lifted from the lower side of the figure, and the movable contact 16 is fixed. The contact 17 is brought into an ON state.
[0021]
Further, when the engaging means in the figure is in the disengaged state, the spring 8 lifts only the crossbar lifting member 7, the crossbar 14 does not lift up, the contact 16 does not contact 17 and is in the OFF state.
[0022]
In FIG. 1, a spring 6 is arranged between the contact input means and the crossbar lifting member 7, and always urges the contact input means to jump out to the position regulated with respect to the case. Yes. In addition, although the spring 6 is hung on the crossbar lifting member 7 in the illustrated example, it may be hung on the case. Further, the contact input means is a crossbar pulling member when the crossbar 14 is at the top depending on the position of the crossbar 14 in the contact ON / OFF state, that is, whether the crossbar 14 is at the top or the bottom in the figure. When the cross bar 14 is at the bottom without being engaged with 7, the engagement is performed in a direction to hold down the cross bar lifting member 7.
[0023]
In the state of FIG. 1, since the contact is in an OFF state and the crossbar 14 is on the lower side of the figure, the contact input means is engaged in a direction to hold down the crossbar lifting member 7, and the contact input means is By pressing from the upper side of the figure, the crossbar lifting member 7 can be pushed down against the spring 8 until the engaging means shown in the figure is engaged. Is released, the cross bar 14 is lifted upward by the urging force of the spring 8, and the contact 16 comes into contact with the contact 17 to shift to the state shown in FIG.
[0024]
In the state of FIG. 2, since the contact is in the ON state and the crossbar 14 is on the upper side of the figure, the contact input means does not engage with the crossbar lifting member 7, and the contact input means is pressed from the upper side of the figure. However, since no force is applied to the crossbar pulling member 7 and the crossbar 14 does not drop downward in the figure, the contact pressure between the contacts 16 and 17 decreases, or the contact temporarily opens to turn off. There is no state.
[0025]
3 to 5 are specific embodiments of the engaging means between the crossbar and the crossbar lifting member of FIG. 1, FIG. 3 is claim 2, FIG. 4 is claim 3, and FIG. 4 is an example. In FIGS. 3 to 5, 1, 2, 6, 8, 15, 16, 17, 18, and contact input means are the same as those shown in FIG.
[0026]
3, 10 is a engaging member, one end is rotated axially supported by the shaft portion 1001 to the cross bar pulling member 19 and the other end always by a spring 21 in the engaging portion 1002 that engages the cross bar 20 It is biased in the engagement direction. When releasing the contact, the contact tripping means shown in the figure urges the engagement member 10 shown in the figure to rotate counterclockwise around the figure 1001 to engage the crossbar 20 and the crossbar lifting member 19. The contact is turned off as shown in FIG. In FIG. 3, the contact input means does not engage with the input member 19, and the engagement of the crossbar pulling member 19 in the direction of holding down from the upper side of FIG. Is the same as
[0027]
Next, in order to shift the contact from the OFF state to the ON state, when the contact closing means is pressed from above in FIG. 4, the crossbar lifting member 19 moves downward from the state in FIG. The engagement between the engagement portion 1002 and the cross bar 20 is restored by the bias of the spring 21, and when the contact input means is released, the state returns to the ON state in FIG.
[0028]
In FIG. 5, reference numeral 23 denotes a crossbar, and a portion 2301 that supports the movable contact plate 15 from the lower side of the drawing has an axial shape, and an engaging portion 2302 that extends from the portion 2301 to the crossbar lifting member side is shown. Have both. The crossbar 23 is swingable about a portion 2301, and the engaging portion 2302 is always urged to the crossbar lifting member 22 side by the spring 24. The contact releasing means rotates the engaging portion 2302 counterclockwise around the portion 2301 to disengage the crossbar lifting member 22 and the crossbar 23, and turns the contact OFF. The return to contact ON by the pressing force of the contact input means after OFF is the same as in the case of FIGS.
[0029]
In FIG. 6, 25 is a cross bar, 26 is an engaging member, and the engaging member of 26 is pivotally supported on the cross bar 25 side, which is different from FIGS. Others are the same as those in FIGS.
[0030]
FIGS. 7, 8, 9 and 10 show an embodiment of claim 5 and an embodiment of the contact input means of claims 1 to 4. FIG. For the sake of explanation, the engaging means is used in FIGS. 3 and 4, but the functions are the same in FIGS. 5 to 6.
[0031]
In FIG. 7, 3, 5, and 29 correspond to the contact input means shown in FIGS. 1 to 6, 5 is an engaging member, and the shaft support portion 502 is pivotally supported by the button member 3 and separated from the shaft support portion 502. In the position, there is an engaging portion 506 in a direction to hold down the crossbar lifting member 19 and a cam portion 505 linked to the extension portion 2801 of the crossbar 28. 29 is a spring that urges the engagement member 5 with respect to the button member 3 in a direction in which the engagement portion 506 engages with the crossbar lifting member 19. The case where it is in the ON state is shown. The button member 3 is supported by a guide part 103 of the case so as to slide in the same direction as the sliding direction of the crossbar lifting member 19.
[0032]
In FIG. 7, since the contact point is in the ON state, the crossbar 28 is located in the upper part of the drawing, and the extension portion 2801 of the crossbar 28 pushes the cam portion 505 of the engagement portion 5 so that the engagement portion 5 is , Against the urging spring 29, it rotates in the clockwise direction in the figure around the shaft support portion 502 with the button member 3, and the engaging portion 506 is disengaged from above the crossbar lifting member 19. Even if the button member 3 is pushed from above in the figure against the spring 6, the crossbar lifting member 19 does not move downward in the figure. Therefore, the pressing pressure of the button member 3 does not affect the contact pressure of the contacts 16 and 17, and the contacts do not open.
[0033]
When the engagement between the engaging member 10 and the cross bar 28 is released from the state shown in FIG. 7 by the contact releasing means, the contact 16 is separated from 17 as described in FIG. It becomes.
[0034]
In the state of FIG. 8, the engagement member 10 and the cross bar 28 are disengaged, the cross bar 28 is lowered downward in the figure, and the cross bar lifting member 19 is urged by the spring 8 to It moves upward in the figure until it comes into contact with the position restricting portion 104. Since the button member 3 is pushed up by the spring 6 from the crossbar pulling member 19 until the edge 301 of the button member 3 contacts the guide portion 103, the cam portion 505 of the engaging portion 5 is The extension 2801 of the cross bar 28 is not pushed away. Thus the engaging member 5, by the spring 29, rotates about the shaft 502 from the state of FIG. 7 in a counterclockwise direction in the figure, the engaging portion 506, located above the cross bar pull-up member 19 8 is engaged, and when the button member 3 is pressed from the state of FIG. 8, the engaging portion 506 presses the crossbar pulling member 19 downward in the figure, so that the engaging member as described in FIG. 10 and the crossbar 28 return to engagement. Thereafter, when the button member 3 is slowly released, the extension portion 2801 of the crossbar 28 pushes the cam portion 505 and rotates the engaging member 5 clockwise in the process of shifting from FIG. 8 to FIG. 7, the engaging portion 506 of the engaging member 5 is disengaged from the crossbar pulling member 19, and there is no restriction for pressing the crossbar pulling member 19. (ON) state.
[0035]
FIG. 9 shows a second embodiment of claim 5. 7 and 8 are different from each other in that a spring plate 30 having a base end fixed to the case is interposed between the cam portion 505 of the engaging member 5 and the cross bar 31, and the spring 6 is engaged. The engaging member 5 is provided between the spring hooking portion 501 and the crossbar pulling member 19 apart from the shaft portion 502 of the member 5, so that the engaging member 5 is rotated counterclockwise with the shaft portion 502 as the center. The moment is given by the spring 6, and the spring 29 in FIG. 7 can be omitted. In the state of FIG. 9, the spring plate 30 is pushed by the cross bar 31 to rotate the engagement member 5 to a position where the engagement portion 506 of the engagement member 5 is disengaged from the cross bar lifting member 19.
[0036]
As shown in FIG. 10, in the state in which the contacts 16 and 17 are open, the spring plate 30 is not pushed by the crossbar 31 but rotates to the right in the figure by self-elasticity. The position is the same as in FIG. The rest of the configuration is the same as in FIGS. 7 and 8, but in the configuration shown in FIGS. 9 and 10, for example, the position of the tip of the spring plate 30 changes depending on whether the contact is ON or OFF. It can be seen or not seen from the hole on the case surface, and can be used for ON / OFF display of the contact.
[0037]
FIG. 11 shows an embodiment of the contact tripping means according to claims 6 to 9, and the three tripping means are collectively shown in one figure.
[0038]
In FIG. 11, 32 is a means for manually turning off the contact from the outside of the case and corresponds to claim 6. 3202 is a lever, located in the fulcrum 3203 crossbar pulling up member 19 as the center and press the HirakiHanarebotan 3201, the lever is rotated around the fulcrum 3203, the lever tip 3204, the engagement member 10 to the shaft 1001 By rotating counterclockwise in the figure, the engagement with the cross bar 20 is released, and the contact is turned OFF.
[0039]
In FIG. 11, 33 is a bimetal, and when an overcurrent flows between the fixed contact plate 18 and the load terminal 35 in the figure, the engagement member 10 is rotated by self-heating and the engagement with the cross bar 28 is released. , Contact turns off.
[0040]
11, 34 is a leak tripping unit consisting of electric leakage detector 3402 and the electromagnet device 3401, the electric leakage detector 3402 detects the earth leakage, when driving the electromagnet 3401, rotates the engagement member 10, The engagement with the cross bar 20 is released, and the contact is turned OFF.
[0041]
The circuit breaker according to the present invention having a desired function can be configured by using a combination of the above-described contact releasing means of 32, 33, and 34 as appropriate.
[0042]
In the above description of the embodiment, the contacts 16, 17, the fixed contact plate 18, the movable contact plate 15 and the like have been described as one. However, the two contacts may be used as a two-pole circuit breaker. Note that the urging force of the spring 6 is several steps smaller than the urging force of the spring 8.
[0042]
【effect】
According to the present invention,
According to the first to fourth aspects of the present invention, the contact input means is configured not to engage the crossbar lifting member when the crossbar is in the contact ON position. Does not change, the contact is not turned off, and the crossbar is engaged in the direction in which the crossbar lifting member is held down when the crossbar is in the OFF position. It has an effect that it is possible to obtain a contact opening / closing mechanism that reliably turns the contact ON when the button is released after returning.
[0043]
The invention of claim 5 provides a specific configuration of the contact input means. By using the contact input means of claim 5, in the process from contact OFF to contact ON, the contact input means and the crossbar lifting member The contact speed of the contacts can be always made constant by depending on the urging force of the crossbar pulling member regardless of the speed at which the button member is released with the finger.
[0044]
The inventions of claims 6 to 9 have the effect that the contact opening means of the inventions of claims 1 to 4 can be turned off by using a desired contact releasing means.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a mechanism in an OFF state of an embodiment of the invention of claim 1. FIG. 2 is an explanatory diagram of a mechanism in an ON state of an embodiment of the invention of claim 1. FIG. FIG. 4 is a mechanism explanatory diagram of the OFF state of the embodiment of the invention of claim 2. FIG. 5 is a mechanism explanatory diagram of the ON state of the embodiment of the invention of claim 3. FIG. 7 is a mechanism explanatory diagram of the ON state of the embodiment of the invention of claim 4. FIG. 7 is a mechanism explanatory diagram of the ON state of the first embodiment of the invention of claim 5. FIG. FIG. 9 is an explanatory diagram of the mechanism in the OFF state of the example. FIG. 9 is an explanatory diagram of the mechanism in the ON state of the second embodiment of the invention of claim 5. FIG. Explanatory drawing [Fig. 11] Explanatory drawing of mechanism of inventions of claims 6, 7, 8, 9
DESCRIPTION OF SYMBOLS 1 Base 2 Cover 3 Button member 5 Engagement member 502 Shaft part 505 Cam part 506 Engagement part 6 Spring 7 Crossbar raising member 8 Spring 10 Engagement member 15 Movable contact plate 16 Movable contact 17 Fixed contact 18 Fixed contact plate 19 Crossbar lifting member 20 Crossbar 21 Spring 22 Crossbar lifting member 23 Crossbar 24 Spring 25 Crossbar 26 Engaging member 27 Spring 28 Crossbar 29 Spring 30 Spring plate 31 Crossbar
1002 Engagement section 3201 Release button 3202 Lever
3203 fulcrum 3401 electromagnet device 3402 leakage detector

Claims (9)

A fixed contact 17, a fixed contact plate 18 fixed to the case by fixing the fixed contact 17, and a fixed contact 17 disposed opposite to the fixed contact 17. The movable contact 16 that contacts and separates, the movable contact plate 15 that is fixed to the movable contact 16 and is always biased away from the fixed contact 17, and the movable contact plate 15 that contacts the fixed contact 17. And a cross bar 14 that slides in the groove 101 of the case in the contact / separation direction of the movable contact 16 and a cross that is urged in a direction in which the movable contact 16 contacts the fixed contact 17 and slides in the case groove 102. The crossbar 14 is brought into contact with the bar pulling member 7, the crossbar 14 and the crossbar pulling member 7 are engaged and disengaged, and the engaging means is always elastically biased in the engaging direction, and the position of the crossbar. ON position The crossbar pulling member 7 is not engaged when the crossbar 14 is in the contact OFF position, and when the crossbar 14 is in the contact OFF position, contact closing means that engages the crossbar pulling member 7 in a direction to hold down is provided. A compression spring 6 is provided between the bar lifting members 7, and contact release means for releasing the engagement between the engagement means and the cross bar 14 and opening the contacts 16 and 17 is provided. Contact switching mechanism. A fixed contact 17, a fixed contact plate 18 fixed to the case by fixing the fixed contact 17, and a fixed contact 17 arranged opposite to the fixed contact 17. The movable contact 16 that contacts and separates, the movable contact plate 15 that fixes the movable contact 16 and is always biased away from the fixed contact 17, and the movable contact plate 15 that contacts the fixed contact 17. And a cross bar 20 that slides in the groove 101 of the case in the contact / separation direction of the movable contact 16 and a cross that is urged in a direction in which the movable contact 16 contacts the fixed contact 17 and slides in the case groove 102 The bar pulling member 19 and the crossbar pulling member 19 are pivotally supported, and an engagement portion 1002 with the crossbar 20 is provided at the end away from the pivotal support portion, and the engagement portion 1002 is always engaged with the crossbar 20. ~ side When the crossbar 20 is in the contact ON position due to the elastically biased engagement member 10 and the position of the crossbar, it does not engage with the crossbar pulling member 7 and when the crossbar 14 is in the contact OFF position, A contact closing means that engages in a direction to hold down the crossbar pulling member is provided, and a compression spring 6 is provided between the contact closing means 1 and the crossbar pulling member 19, and the engagement means 10 and the crossbar 14 are engaged. A contact opening / closing mechanism comprising contact release means for releasing the contact and opening the contacts 16 and 17. A fixed contact 17, a fixed contact plate 18 fixed to the case by fixing the fixed contact 17, and a fixed contact 17 disposed opposite to the fixed contact 17. The movable contact 16 that contacts and separates, the movable contact plate 15 that is fixed to the movable contact 16 and is always biased away from the fixed contact 17, and the movable contact plate 15 that contacts the fixed contact 17. A cross bar 23 that slides in the groove 101 of the case in the direction of contact and separation of the movable contact 16, and a cross that is urged in a direction in which the movable contact 16 contacts the fixed contact 17 and slides in the case groove 102 a bar pulling member 22, the cross bar 23, which rotates around the support portion 2301 of the movable contact plate 15, the engagement between the cross bar pulling member 22 at a position apart from the pivoting central Comprising a 2302, engagement portion 2302 is always elastically urged to the side which engages the cross bar pulling member 22, the position of the crossbar in contact ON and OFF, when the crossbar 23 is in contact ON position When the crossbar 23 is not engaged with the crossbar pulling member 22 and the crossbar 23 is in the contact OFF position, contact putting means for engaging the crossbar pulling member 22 in a direction to suppress the crossbar pulling member 22 is provided. A contact opening / closing mechanism including a compression spring 6 and contact release means for releasing the engagement between the crossbar pulling member 22 and the crossbar 23 and opening the contacts 16 and 17. . A fixed contact 17, a fixed contact plate 18 fixed to the case by fixing the fixed contact 17, and a fixed contact 17 disposed opposite to the fixed contact 17. The movable contact 16 that contacts and separates, the movable contact plate 15 that is fixed to the movable contact 16 and is always biased away from the fixed contact 17, and the movable contact plate 15 that contacts the fixed contact 17. And a cross bar 25 that slides in the groove 101 of the case in the contact / separation direction of the movable contact 16 and a cross that is urged in a direction in which the movable contact 16 contacts the fixed contact 17 and slides in the case groove 102. The bar pulling member 22 is pivotally supported by the cross bar 25, and is provided with an engaging portion 2601 with the cross bar pulling member 22 at a position away from the shaft supporting portion. Kakariawase the engagement member 26 is elastically biased to the side that engages the member 22, the position of the crossbar in contact ON and OFF, to the crossbar pulling member 22 when the crossbar 25 is in contact ON position First, when the cross bar 25 is in the contact OFF position, contact closing means that engages in a direction to suppress the cross bar lifting member 22 is provided, and the compression spring 6 is interposed between the contact charging means and the cross bar lifting member 22. And a contact opening / closing mechanism comprising contact release means for releasing the engagement between the crossbar pulling member 22 and the engagement member 26 and opening the contacts 16 and 17. The contact input means includes the engagement member 5 and the button member 3 that is operated by pressing with a finger. The engagement member 5 includes a shaft support portion 502, a cam portion 505 at a position away from the shaft support portion 502, An engaging portion 506 is provided, and the shaft supporting portion 502 of the engaging member 5 is pivotally supported by the button member 3 so that the engaging portion 506 is always urged toward the crossbar lifting member. The cam portion 505 is linked to the crossbar, and when the crossbar is at the contact ON position, the engaging member 5 is disengaged from the crossbar lifting member with the engaging portion 506 centered on the shaft support portion 502, When the cross bar is in the contact OFF position, the engaging portion 506 is engaged with the cross bar lifting member by urging, and the button member 3 slides in the sliding direction of the cross bar lifting member at the guide portion 103 of the case. It is characterized by being regulated Contact switching mechanism according to any one of Motomeko 1 to 4. The contact opening / closing mechanism according to any one of claims 1 to 5 , wherein the contact opening means is a manual opening means using a release button 3201 and a lever 3202. Wherein, contact opening means, characterized in that the over-current detection means according to the bimetal, contact switching mechanism according to any one of claims 1 to 5. The contact opening / closing mechanism according to any one of claims 1 to 5 , wherein the contact opening means is a leakage detector and an electromagnet device connected to the leakage detector. The contact opening / closing mechanism according to any one of claims 1 to 5 , wherein the contact opening means is an appropriate combination of the sixth, seventh, and eighth aspects .

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