JP2014195402A - Safety device for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device for a circuit breaker which can be visually confirmed even in the state where an electric wire is connected to a distribution board, reduces the risk of unlocking internal equipment and a mounting plate as far as possible when mounting the distribution board and further, is capable of easily performing a correcting operation when correction of a lock lever is required.SOLUTION: A safety device 104 is formed integrally with a lock lever 1041 for mounting and fixing a circuit breaker 1 onto a mounting plate and comprises an extension part extending from the lock lever and a display part provided in an end portion of the extension part. The safety device for the circuit breaker is characterized in that, when the circuit breaker is located at a right mounting position and the lock lever is not fixed, the display part protrudes from a casing front side of the circuit breaker to the outside, thereby visually confirming the display part from the outside of the circuit breaker.

Description

The present invention relates to a safety device for a circuit breaker incorporated in a distribution board, and more particularly, to a safety device provided in a circuit breaker capable of confirming whether or not the usage state of the circuit breaker is appropriate.

Internal devices such as circuit breakers incorporated in the distribution board are used with the internal device body attached to a mounting plate. FIG. 1 of Patent Document 1 shows a structure in which a circuit breaker is attached to and detached from a mounting plate. According to this structure, the circuit breaker is attached to and detached from the attachment plate as follows.

The locking portion 703 of the lock lever 7 of the circuit breaker 1 is not protruded from the bottom surface of the circuit breaker, so that the breaker comes between the protrusions a9 and b10 of the mounting plate, and the four claws It mounts on a mounting plate so that the part b may come in the opening part of the recessed part b of 6 of a circuit breaker. At this time, the claw portions 3 and 4 and the recesses 5 and 6 of the circuit breaker are not engaged with each other. Next, when the circuit breaker 1 is slid in the direction of the buses 11 and 12, the buses 11 and 12 are inserted into the plug-in terminal fittings 15 and 16, and the claw portion 3 and the claw portion 4 provided on the mounting plate. Engages with the recess 5 and the recess 6 of the circuit breaker, respectively. The lock lever 7 can be operated with the finger hook portion 702 selectively at the upper end portion and the lower end portion of the frame portion 701 so that the locking portion 703 protrudes or does not protrude from the bottom surface.

In this state, the circuit breaker is restricted from moving in the upward direction (vertical direction with respect to the mounting plate) in FIG. It can be removed in the load side direction).

Next, when the finger hooking portion 702 of the lock lever 7 is pressed in the direction of the mounting plate with a finger, the locking portion 703 protrudes from the bottom surface of the circuit breaker and is fitted into the fitting portion 8 of the mounting plate. Thereby, the movement of the direction which removes a circuit breaker from a bus-bar can be controlled, and the circuit breaker 1 will be in the state where attachment to the attachment board 2 was completed.

When removing the circuit breaker 1 from the mounting plate 2, the finger hooking portion 702 of the lock lever 7 is pulled up with the finger in the direction opposite to the mounting plate, and the fitting portion 8 and the locking portion 703 of the lock lever 7 are fitted. Is released. Next, the circuit breaker 1 is moved so as to be pulled out in the direction opposite to the bus bars 11 and 12, so that the fitting of the claw part 3 and the claw part 4 with the recessed part 5 and the recessed part 6 is released. In this state, the circuit breaker 1 can be removed from the mounting plate 2 by lifting it from the mounting plate.

In such a circuit breaker mounting structure, in order to mount the plug-in type circuit breaker 1 on the mounting plate 2 provided on the distribution board, a claw portion that restricts the movement in the direction perpendicular to the mounting plate 2 3 and the claw part 4 are provided on the mounting plate 2, and the concave part 5 and the concave part 6 respectively corresponding to the claw parts 3 and 4 are provided on the circuit breaker 1. The circuit breaker 1 is provided with a lock lever 7 for restricting the movement in the direction in which the device 1 is removed, and the fitting plate 8 is provided with a fitting portion 8 for fitting the lock lever 7 to restrict the side of the circuit breaker. Since the protruding portion 9 and the protruding portion 10 are provided on the mounting plate 2, it is possible to mount the plug-in type circuit breaker while sliding in parallel with the mounting plate, and even when the electric wire is routed in the distribution board lever Hook finger is not likely to damage the wire coating because it does not only slightly protrudes from the load-side side face of the circuit breaker. It is another object of the present invention to provide an attachment structure that does not require the use of a tool for removing the circuit breaker and does not require the carrying of the tool.

When installing a distribution board with an internal device such as a circuit breaker attached to a construction material that constitutes a wall surface or the like, the distribution board is generally drawn from the wall surface to the side where the distribution board is attached. The cable is temporarily pulled into the box from the wiring hole provided in the box on the distribution board, and the box on the distribution board is pressed toward the wall surface in this state, and the box is placed at a predetermined position on the wall surface. It is installed by screwing.

Inside the distribution board box, there is an insole constructed by attaching internal devices such as the main switch and branch switch to the mounting plate. When installing the distribution board on the wall, the box When the box of the distribution board is pressed against the wall surface in the state where the electric wire is pulled in, the tip of the electric wire and the covering part of the side face abut against the insole, and the insole is A force may be applied to push back in the direction opposite to the direction in which the distribution board is pressed against the wall surface.
Usually, the inner bottom of the mounting plate or the like is screwed and fixed in the box, and as described above, force is applied so that it is pushed back in the direction opposite to the direction in which the distribution board box is pressed against the wall surface. Even if it is received, it cannot be removed from the box.

JP 2002-150911 A

Nowadays, efforts for product safety have become more important than ever. Circuit breakers and distribution boards that incorporate circuit breakers have the role of supplying electricity supplied by the power company to each branch circuit, while circuit breakers are a security that protects wiring from electrical accidents. Therefore, it is necessary to use it properly attached to the distribution board.

When checking whether the circuit breaker is correctly attached to the mounting plate of the distribution board, open the cover on the entire surface that constitutes the distribution board, and check whether the circuit breaker is properly arranged. In addition to visually confirming whether or not, the above-mentioned lock lever is visually confirmed whether or not the lock lever is properly pressed in the direction of the mounting plate.

However, the lock lever is located near the bottom of the circuit breaker, near the mounting plate, and closer to the bottom of the circuit breaker than the wire insertion hole. In this case, it is necessary to sequentially check the inside of the case where the mounting plate is placed on the distribution board so that the confirmation work takes time. Also, at the site where a distribution board is installed, when checking before wiring the circuit breaker, check the inside of the case by looking into the case, but check again after wiring. When doing so, the wired wire will obstruct the visual inspection of the lock lever, and the confirmation work will be performed while avoiding the electric wire, making it difficult to perform the confirmation work and the lock lever being in an inappropriate state, that is, a circuit breaker. When the use state of the cable is not appropriate, it is necessary to access the lock lever after scraping the electric wire and to push the lock lever down to the mounting plate, and it takes time for the confirmation work and the correction work.

In addition, when installing the distribution board on a construction material such as a wall surface, the mounting plate is pushed back in the direction opposite to the direction in which the box of the distribution board is pressed against the wall surface by the electric wire drawn out from the wall surface. In rare cases, the tip of the wire drawn from the wiring hole of the box or the coating on the side surface abuts against the finger hooking portion 702 of the lock lever, and presses the distribution board box against the wall surface. When going, the lock lever may be pushed back in a direction that does not protrude from the bottom surface, and the locking may be released.

In the state where the locking by the lock lever is released, the circuit breaker is restricted in position in the direction perpendicular to the mounting plate and in the juxtaposed direction, but the circuit breaker is prevented from falling off from the power supply side terminal toward the load side terminal. There is a risk that the power supply side terminal may come off from the bus bar without being regulated.

In the initial state before the distribution board is pressed against the wall, the lock lever protrudes from the bottom of the circuit breaker and the circuit breaker is prevented from coming off. It is difficult to notice that the circuit breaker has been released, and if the cable is connected to the load side terminal and starts to be used, the circuit breaker may be disconnected from the busbar or disconnected due to secular use or vibration. As a result, various electrical failures such as poor contact between the bus and the terminal, abnormal heat generation at the terminal portion, and occurrence of a power failure may occur.

The fact that the lock lever has been released by pressing the distribution board against the wall surface is especially difficult to notice when checking the lock lever status again after wiring, and the lock lever status is not appropriate. There was a risk of oversight.

Therefore, the present invention has been made in view of the above problems, and the circuit breaker is installed even when the circuit breaker is attached to the mounting plate of the internal device in the distribution board and the wire is wired. The position of the lock lever to be fixed to the mounting plate can be easily and visually confirmed, and when the distribution board is mounted on a construction material such as a wall surface, the wire drawn from the wall surface to the side where the distribution board is mounted, Reduces the risk of the lock between the internal device and the mounting plate coming off by abutting and sliding against the internal device attached to the mounting plate that constitutes the insole, and also requires the lock lever to be corrected. It is an object of the present invention to provide a safety device for a circuit breaker which can be easily corrected when it becomes.

The safety device for a circuit breaker according to the present invention is configured to solve the above-described problem, and confirms whether or not the use state of the circuit breaker incorporated in the distribution board is in an appropriate state. A safety device provided in a circuit breaker for the circuit breaker, the safety device having a circuit breaker with respect to a mounting plate to which a circuit breaker and a bus for supplying power to the circuit breaker are attached in a distribution board Whether or not the circuit breaker is correctly installed can be visually recognized from the outside of the circuit breaker, and the circuit breaker is protruded from the bottom surface of the circuit breaker in order to fix or unmount the circuit breaker with an external knob. An extension portion that is formed integrally with a lock lever that is alternatively selected, and that extends from the lock lever on a front surface side provided with an operation handle for operating on / off of the circuit breaker from the bottom surface side; Installed at the end of the extension The extension portion is provided between the wire insertion holes for connecting the wires to the load-side terminal of the circuit breaker, and has the function of an insulating wall that prevents the wires from contacting each other. A circuit breaker safety device may be configured.

According to such a configuration, when the circuit breaker is in the correct mounting position and the lock lever is not fitted into the fitting portion, the display portion is interlocked with the lock lever and the housing of the circuit breaker. By projecting from the front side to the outside, the display unit can be seen from the outside of the circuit breaker. Therefore, the circuit breaker is attached to the mounting plate regardless of whether the distribution board is shipped from the factory or before and after wiring the circuit breaker. It is possible to provide a safety device for a circuit breaker that can easily and reliably visually check the position of a lock lever to be fixed and that is excellent in safety when connecting electric wires.

As described above, according to the present invention, the circuit breaker is attached and fixed to the mounting plate even when the circuit breaker is attached to the mounting plate of the internal device in the distribution board and the electric wire is wired. The position of the lock lever can be easily and visually confirmed, and when the distribution board is attached to a construction material such as a wall surface, the wires that are drawn from the wall surface to the side where the distribution board is attached constitute the insole Touching and sliding on internal devices attached to the plate to reduce the possibility of the lock between the internal device and the mounting plate being released as much as possible, and when the lock lever needs to be corrected, it is easily corrected An operable circuit breaker safety device can be provided.

The external appearance block diagram of the circuit breaker which shows embodiment of this invention is shown. The external appearance block diagram of the circuit breaker and mounting plate of this invention is shown. The figure which looked at the circuit breaker of this invention from the bottom face side is shown. The whole safety device perspective view of the present invention is shown. The sliding state figure of the safety device of this invention and a circuit breaker is shown. The principal part internal block diagram of the circuit breaker which shows embodiment of this invention is shown. The principal part sectional drawing of FIG. 7 is shown. The figure which looked at the operating state of the safety device of this invention from the back side is shown. The 2nd external appearance block diagram of the circuit breaker which shows embodiment of this invention is shown. The attachment relation figure of the safety device of this invention and a circuit breaker is shown. The figure which looked at the circuit breaker of this invention from the back side is shown. The external appearance block diagram of the circuit breaker which shows 2nd embodiment of this invention is shown. The enlarged view of the lock lever part of the circuit breaker which shows 2nd embodiment of this invention is shown. The figure of the principal part side view of the circuit breaker which shows 2nd embodiment of this invention is shown. The figure of the principal part bottom view of the circuit breaker which shows 2nd embodiment of this invention is shown.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
FIG. 1 is an external perspective view of a circuit breaker 1 having a safety device according to the present invention. The circuit breaker 1 is formed by casings 101 and 102 in which the outer shell of the main body is divided in the longitudinal direction. The circuit breaker 1 includes a power supply side connection terminal connected to a power supply, a contact connected to the power supply connection terminal, a contact open / close mechanism for opening / closing the contact, and a contact open / close mechanism when an abnormal current is generated. An automatic shut-off mechanism for turning on and off, a load side connection terminal for supplying power to the load side circuit, and the like are provided inside the case, and an operation handle 103 for turning on and off the contact opening / closing mechanism from the outside of the case Is provided on the front side. 105 and 106 are electric wire insertion holes for connecting electric wires to the load side terminals of the circuit breaker 1. The power supply side connection terminal is configured by using a plug-in type terminal, and the load side connection terminal is configured by using a lock connection terminal.

The power supply side terminal side of the circuit breaker 1 is the front side, the load side terminal side is the back side, the side on which the operation handle 103 is provided is the front side, and the side attached to the mounting plate described later is the bottom side. A safety device 104 is provided on the back side.

FIG. 2 shows a mounting plate 2 to which the circuit breaker 1 is attached. The mounting plate 2 is for mounting internal devices such as a circuit breaker and buses 201, 202, and 203 for supplying power to the internal devices.

The mounting plate 2 has first restricting portions 204 and 205 that interact with the circuit breaker when the circuit breaker 1 is attached and restrict the movement of the circuit breaker in the direction from the front side to the bottom side. A second restricting portion 206 that restricts movement in the side-back direction is provided.

The first restricting portion 204 is formed by cutting and raising a part of the mounting plate 2, and the end portion is an engagement piece. On the circuit breaker 1 side, as shown in FIG. 3, the concave portion 107 into which the first restricting portion is fitted on the bottom surface side of the circuit breaker 1, and the engagement piece provided on the bottom surface side of the concave portion. Engaging engagement pieces 108 are provided. When the circuit breaker 1 is attached to the mounting plate 2, the engagement pieces engage with each other, thereby restricting the movement in the direction from the front side to the bottom side on the back side of the circuit breaker.

The first restricting portion 205 is formed to protrude from the mounting plate, and a recess (not shown) into which the protruding portion of the second restricting portion 205 is fitted is formed on the front side of the circuit breaker 1. . By engaging these protrusions and recesses, the movement in the direction from the front side to the bottom side is restricted on the front side of the circuit breaker. Since the movement in the direction from the front side to the bottom side is restricted on both the front side and the back side of the circuit breaker, the circuit breaker can be more reliably fixed to the mounting plate.

The second restricting portion 206 is formed by bending a part of the mounting plate 2 into a concave shape to form a concave portion. On the back side of the circuit breaker 1, a lock lever 1041 is provided to project from the bottom surface of the circuit breaker 1 and to selectively select whether or not by the external knob 1042, and projects from the bottom surface of the circuit breaker 1. When the lock lever 1042 fits into the recess of the second restricting portion 206 and fits with each other, the movement of the circuit breaker in the direction from the front side to the back side is restricted.

When the circuit breaker 1 is attached to the mounting plate 2, the circuit breaker 1 is slid in the direction of the bus on the mounting plate 2, so that the bus is inserted into the power supply side terminal and the first The circuit breaker 1 is placed at an appropriate position on the mounting plate 2 by engaging the restricting portions 204 and 205 with the engaging piece 108 (not shown) of the circuit breaker 1. Then, by pushing down the external knob 1042 of the lock lever 1041 in the direction of the mounting plate 2, the lock lever 1041 protrudes from the bottom surface of the circuit breaker 1 and engages with the concave portion of the mounting plate 2 to complete the mounting.

When removing the circuit breaker 1 from the mounting plate 2, the external knob 1042 of the lock lever 1041 is pulled up in the direction opposite to the mounting plate (front side of the circuit breaker 1) so that the lock lever 1041 does not protrude from the bottom surface. By moving the circuit breaker 1 so as to be pulled out to the back side, the engagement between the first restricting portions 104 and 205 and the circuit breaker is released, and at the same time, the connection between the bus bar and the connection terminal is released, and the circuit breaker 1 is removed. Complete.

Further, the lock lever 1041 is formed with an elastic arm portion 1046 that is elastically formed so that the position of the lock lever 1041 protruding from the bottom surface of the circuit breaker 1 and the position not to be determined are determined. As shown in FIGS. 6 and 7, climbing protrusions 1012, 1022 that slide with the elastic arm portions are formed inside the casings 101, 102 on the back surface-bottom surface side. When the lock lever is pushed down in the direction of the mounting plate and pulled up to the front side by operating the external knob 1042 of the lock lever, the elastic arm portion is bent over the protrusions 1012, 1022 while being bent. Is alternatively determined and the position is maintained.

Further, the lock lever 1041 is formed with a trapezoid climbing protrusion 1047 whose bottom surface is inclined with respect to the mounting plate. When the circuit breaker is to be placed on the mounting plate 2, for example, when the circuit breaker is slid in the direction of the bus bar while the lock lever 1041 is protruding from the bottom surface of the circuit breaker, the slope becomes the mounting plate. 2 is converted into a force for pushing the lock lever 1041 to the front side, and the lock lever 1041 is pushed to the front side. At this time, if the elastic arm portion 1046 has a positional relationship such that the elastic protrusion 1012 does not get over the overhanging protrusions 1012, 1022, the slide advances, and when the lock lever 1041 reaches the recess fitting portion of the mounting plate 2, The force pushed up to the front side is lost, and the elastic arm 1046 is forced to return to the original protruding state. The lock lever 1041 protrudes from the bottom surface of the circuit breaker 1, and it is not necessary to push down the external knob. Complete.

Next, the safety device 104 will be described. FIG. 4 shows an external perspective view of the safety device. The safety device 104 is formed integrally with the lock lever 1041, and is provided at an end portion of the extension portion 1043 extending from the lock lever from the bottom surface side to the front surface side of the circuit breaker. A display unit 1044. A pressing portion 1045 is formed at the front side end of the display portion 1044. A sliding portion 1048 is formed in the extending portion 1043 by digging a part of the meat of the extending portion. The sliding portion 1048 is slid with the sliding portion 1011 formed on the housing side shown in the cross-sectional view of the main part of FIG. 5 and serves as a guide during the operation of the safety device 104.

The display unit 1044 is slidably supported on the inner side of the cylindrical support unit by cylindrical support units 1012, 1022 provided on the housing.

As shown in FIG. 8, the display unit 1044 in the safety device 104 is concealed by the support when the lock lever 1041 protrudes from the bottom, and the support 104 when the lock lever 1041 does not protrude from the bottom. Project from the front to the outside of the housing.

Next, the operation of the safety device 104 will be described with reference to FIG. 1, FIG. 9, FIG. 10, and FIG. First, in a state where the lock lever 1041 does not protrude from the bottom surface, the display portion 1044 protrudes from the support portion of the housing to the front surface side of the housing. In a state where the circuit breaker 1 is placed on the mounting plate 2 and is slid to the bus bar side, and the first restricting portions 204 and 205 are engaged with the engagement pieces 108 (step 1), the circuit breaker 1 is The circuit breaker is installed in the proper position. From this state, when the external knob 1042 of the lock lever 1041 is pushed down in the direction of the mounting plate and the lock lever 1041 is protruded from the bottom surface (step 2), the display portion 1044 is hidden by the support portion of the housing. Installation of the circuit breaker on the mounting plate is completed.

Now, if multiple circuit breakers 1 are arranged side by side on the mounting plate 1, if there is something that has been installed in the same way as in Step 1, check before shipping or inspection during construction. Sometimes it is easy to notice that there is a circuit breaker that is not properly installed by opening the cover of the distribution board and performing visual confirmation from the front side. That is, when the display unit 1044 protrudes to the outer front side of the housing, it can be easily recognized that the lock lever is not pushed down.

In this state, when the lock lever is pushed down in order to perform step 2, the force is transmitted to the lock lever 1041 via the extension 1043 by pressing the pressing portion 1045 provided on the display portion 1044. The lock lever can be pushed down. In particular, after completing the on-site wiring work, if there is something that has been installed in step 1 without having to scrape the wiring, it is not necessary to push down the external knob 1042 of the lock lever 1041. In addition to ensuring safety, improvement in convenience during construction can be expected.

Further, the extending portion 1043 in the safety device 104 is formed in a substantially triangular shape that becomes narrower from the front side to the back side. This makes it easier to guide the electric wire into the electric wire insertion hole when the electric wire is inserted into the electric wire insertion holes 105 and 106 on the load side. Moreover, it also has an effect | action as an insulating wall for making it difficult to contact the electric wires inserted in each electric wire insertion hole.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIGS. 12 to 15 while paying attention to the surrounding portion disposed around the external knob 1042.

A surrounding portion 109 is formed around the external knob 1042 so as to avoid the movement trajectory in the vertical direction so as not to hinder the movement of the external knob 1042. The surrounding portion 109 is configured by forming ribs on a part of the body of the circuit breaker on the side surfaces 109c and 109d and the bottom surfaces 109a and 109b of the external knob 1042 of the safety device 104.

In this embodiment, the 109a part and 109b part by the side of the bottom which comprise the surrounding part 109 are comprised so that the electric wire connected to the load side terminal part of a circuit breaker may not enter from the bottom side. . This is because the device bodies of the circuit breakers are divided in the juxtaposed direction, and a predetermined margin is given to the fitting between the surrounding portions provided in the respective device bodies. Note that the bottom surface side 109a and 109b portions may be in close contact with each other without being separated.

Further, the 109a portion and 109b portion on the bottom side of the surrounding portion 109 are configured such that the distance from the external knob 1042 increases as the central portion of the body is advanced. Accordingly, when the safety device 104 is pulled up with the external knob 1042, a finger can easily enter between the surrounding portion 109 and the external knob.

Note that an enclosure portion may be formed on the front side of the external knob 1042 so as to face the enclosure portion on the bottom surface side so as to surround the outer knob 1042. Accordingly, it is possible to prevent foreign matters from entering from the front side in addition to the bottom side and the side surface.

As shown in FIGS. 14 and 15, the height of the rib forming the surrounding portion 109 is such that the external knob 1042 is in a side view facing the circuit breaker 1 from the parallel direction of the circuit breaker 1. It is provided so as not to protrude outward from the surrounding portion 109. Further, the external knob 1042 is provided so as not to protrude outward from the surrounding portion 109 when viewed from the bottom facing the circuit breaker 1 from the mounting surface side of the circuit breaker 1.

When installing a distribution board with a mounting plate to which a circuit breaker configured in this way is attached to a wall surface, the electric wire drawn out from the wall surface to the side where the distribution board is attached, It is once drawn into the box from the wiring hole provided in the box. And when pressing the box of the distribution board with the wires pulled in the direction of the wall, the direction in which the insole presses the distribution board against the wall surface by the wires coming into contact with the insole and sliding A force is applied to push back in the opposite direction.

At this time, since the insole is screwed and fixed in the box, it does not come off the box. In addition, since the circuit breaker 1 is restricted from moving in three directions in the vertical direction, the side surface direction, and the direction in which the circuit breaker is removed from the bus bar with respect to the mounting plate 2, the electric wire abuts against the circuit breaker and slides. Even if it moves, the circuit breaker does not come off the insole.

Further, an encircling portion 704 is provided in the vicinity of the finger hook portion 702, and the finger hook portion 702 does not protrude outward from the envelop portion 704, so that the electric wire is not in contact with the finger hook portion 702. The wire abuts against the surrounding portion 704, and the electric wire does not directly abut against or slide on the finger hook portion 702, thereby eliminating the possibility of releasing the circuit breaker from the busbar.

Unless the direction in which the circuit breaker is removed from the busbar is not released, the circuit breaker 1 is not released from the vertical and lateral restrictions on the mounting plate 2, and the circuit breaker 1 is removed from the busbar from the mounting plate 2. There is no possibility that various electrical failures such as contact failure between the busbar and the terminal, abnormal heat generation of the terminal portion, occurrence of power failure, etc. occur.

When removing the circuit breaker 1 from the mounting plate 2, the external knob 1042 of the safety device 104 is lifted with a finger in the direction opposite to the mounting plate, and the fitting portion 206 and the locking portion of the lock lever 1041 are fitted. Release the match. At this time, the 109a portion and 109b portion on the bottom surface side of the surrounding portion 109 are configured so that the distance from the external knob 1042 increases as the central portion of the body is advanced. Therefore, when the external knob 1042 is pulled up, The finger can easily enter between the surrounding portion 109 and the external knob.

The display unit 1044 and the pressing unit 1045 in the safety device may be configured by forming a second external knob 1049 that is partially bent. Thereby, in addition to pushing down the lock lever 7 from the front side of the circuit breaker 1, it is also possible to perform an operation of pulling up, and further improvement in convenience when the circuit breaker 1 is attached and detached can be expected.

In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

For example, when the display portion 1044 is colored and the display portion protrudes from the support portions 1012, 1022, the display portion 1044 may be formed to be easily visible from the outside.
Further, the protrusion of the display unit 1044 from the support units 1012, 1022 may be formed so as to be more conspicuous that the state of step 1 is maintained.
In addition, the extending portion 1043 may be extended to the back side so as to enhance the insulation performance between the electrodes.

Further, coloring, character display, and graphic display are performed on the wall surface 110 that is exposed when the lock lever 104 is pressed down in FIG. 13B, and the characters and graphics displayed on the wall surface 110 when the lock lever 104 is normally pressed down. Alternatively, the colored portion may be exposed so that the locked state can be visually recognized. The wall portion 110 may be formed by projecting a part of the body constituting the circuit breaker 1.

Further, in the embodiment, as an example of the means for restricting the position of the side surface of the circuit breaker, the projection portion 207 provided on the mounting plate 2 is shown. However, the fitting direction of the first restricting portion 204 and the recess 107 is changed. In addition to fitting in the direction connecting the power source side and the load side of the circuit breaker, the fitting portion in the juxtaposed direction is formed in the recess 107 so that the circuit breaker can be fitted in the juxtaposed direction. By setting the dimensions in the juxtaposed direction of the parts and the recesses substantially equal, the movement in the juxtaposed direction can be regulated instead of the protruding part 207 that regulates the position of the side surface of the circuit breaker. In addition, it is good also as a structure controlled more firmly together with the protrusion part 207. FIG.

Moreover, although the fitting part 206 demonstrated by the example formed by bending the edge part of the attachment plate 2, it is good also as a hole corresponding to the magnitude | size of the latching | locking part 1041, and the parallel arrangement direction of a hole and a latching | locking part is sufficient. By setting the dimensions substantially the same, the movement in the juxtaposed direction can be restricted in place of the protrusion 207 that restricts the position of the side surface of the circuit breaker. In addition, it is good also as a structure controlled more firmly together with the protrusion part 207. FIG. Furthermore, although the circuit breaker has been described with an example in which the power supply side terminal has a plug-in structure, the circuit breaker can also be implemented with a normal screw terminal, and these can be changed as appropriate without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Circuit breaker 101 Case 102 Case 1012 Support part 1022 Support part 103 Operation handle 104 Safety device 1041 Lock lever 1042 External knob 1043 Extension part 1044 Display part 1045 Press part 1046 Elastic arm part 1047 Trapezoid climbing protrusion 1048 Sliding Part 105 Electric wire insertion hole 106 Electric wire insertion hole 107 Recess 108 Engagement part 109 Enclosure part 110 Wall part 2 Mounting plate 201 Busbar 202 Busbar 203 Busbar 204 First regulation part 205 First regulation part 206 Second regulation part 207 Projection Part

Claims (1)

A safety device provided in a circuit breaker for confirming whether or not a circuit breaker incorporated in a distribution board is in an appropriate state of use,
The safety device is
Whether or not the circuit breaker is correctly attached to the mounting plate on which the circuit breaker and the bus for supplying power to the circuit breaker in the distribution board are attached, is visible from the outside of the circuit breaker,
In order to fix or release the circuit breaker on the mounting plate, it is alternatively selected by projecting from the bottom surface of the circuit breaker or by pushing it down or pulling up with the external knob in the direction of the mounting plate. Formed integrally with the lock lever
An extension part extending from the lock lever on the front side provided with an operation handle for operating on / off of the circuit breaker from the bottom side;
The extension portion is provided between the wire insertion holes for connecting the wires to the load-side terminal of the circuit breaker, and the wires are in contact with each other. A circuit breaker safety device, which also has the function of an insulating wall to prevent damage.