JP2021068662A - Circuit breaker - Google Patents

Abstract

To provide a circuit breaker capable of reliably preventing the burning of a coil when reversely connected, without providing a switch to protect the coil.SOLUTION: A circuit breaker 10 includes: an electrical circuit opening/closing part 40 that operates to switch the opening/closing of an electrical circuit; a trip coil device 100 allowing the electrical circuit opening/closing part 40 to operate so that it becomes an open state when an electric leakage occurs; a test button 60 operated by a user to test the operations of the trip coil device 100 and the electrical circuit opening/closing part 40. The circuit breaker 10 further includes an operation prevention mechanism to prevent the test button 60 from being operated when the electrical circuit opening/closing part 40 is in an open state.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to circuit breakers.

The circuit breaker is used as a device for switching the opening and closing of an electric circuit, for example, inside a distribution board. When the circuit breaker is configured as a so-called "earth leakage breaker", the circuit breaker has a function of cutting off the electric circuit according to the operation performed by the user on the handle, and also when an electric leakage occurs. It also has a function to detect this and automatically shut off the electric circuit.

In order to realize such an earth leakage breaker function, the circuit breaker is a zero-phase current transformer for detecting the occurrence of an earth leakage, and the electric circuit is switched to an open state according to a signal from the zero-phase current transformer. A trip coil device or the like is provided for this purpose. Further, the circuit breaker is provided with a test operation unit operated by the user in order to confirm that the trip coil device and the like operate normally. The test operation unit is, for example, a test button pressed by the user.

The electric power for operating the trip coil device and the like is supplied from the load side part of the electric circuit inside the circuit breaker. In such a configuration, when the electric circuit is opened by operating the handle or the like, power is not supplied to the trip coil device or the like. Therefore, even if an operation is performed on the test operation unit when the electric circuit is open, no current flows through the coil portion of the trip coil device.

However, when the circuit breaker is reversely connected, that is, when the circuit breaker is connected so that power is supplied from the load side, even when the electric circuit is opened by the steering wheel operation or the like. , Power will continue to be supplied to the trip coil device and the like. In such a configuration, if an operation is performed on the test operation unit while the electric circuit is open, the current continues to flow in the coil portion of the trip coil device, so that the coil burns out. There is a possibility that it will end up.

Therefore, in the circuit breaker described in Patent Document 1 below, a switch linked to the operation of the movable contactor is provided in the middle of the path for supplying electric power to the trip coil device. In such a configuration, when the electric path is opened by operating the handle or the like, the above switch is also switched to the open state in conjunction with the movable contactor, and power is not supplied to the trip coil device thereafter. This makes it possible to prevent the coil from burning as described above.

Japanese Unexamined Patent Publication No. 2002-216612

However, in a configuration in which a switch is separately provided for the purpose of protecting the trip coil device, such as the circuit breaker described in Patent Document 1, the number of parts is increased and the man-hours for mounting the switch are increased. It is not preferable from the viewpoint of cost because it increases.

It is an object of the present disclosure to provide a circuit breaker capable of reliably preventing coil burnout when reversely connected without providing a switch for protecting the coil.

The circuit breaker according to the present disclosure includes an electric circuit opening / closing part that operates to switch the opening / closing of the electric circuit, a tripping coil device that operates the electric circuit opening / closing part so as to be in an open state when an electric leakage occurs, and a tripping coil. It includes a test operation unit operated by a user to test the operation of the device and the electric circuit opening / closing unit. This circuit breaker further includes an operation prevention mechanism for preventing the test operation unit from being operated when the electric circuit opening / closing unit is in the open state.

In the circuit breaker having such a configuration, the operation prevention mechanism prevents the test operation unit from being operated when the electric circuit opening / closing unit is in the open state. When the electric circuit opening / closing part is in the open state, the operation itself for the test operation part cannot be performed. Therefore, even if a switch as described in Patent Document 1 is not provided, the coil is surely prevented from burning. Is possible.

According to the present disclosure, there is provided a circuit breaker capable of reliably preventing the coil from burning when it is reversely connected without providing a switch for protecting the coil.

FIG. 1 is a diagram schematically showing the appearance of the circuit breaker according to the present embodiment. FIG. 2 is a diagram showing an internal structure of the circuit breaker according to the present embodiment. FIG. 3 is a diagram showing an internal structure of the circuit breaker according to the present embodiment. FIG. 4 is a diagram showing an internal structure of the circuit breaker according to the present embodiment. FIG. 5 is a diagram schematically showing a circuit configuration of the circuit breaker according to the present embodiment. FIG. 6 is a diagram showing an internal structure of the circuit breaker according to the present embodiment.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.

The circuit breaker 10 according to the present embodiment is attached to a distribution board (not shown), and is configured as a device for switching the opening and closing of the electric circuit in the distribution board. As shown in FIG. 1, the circuit breaker 10 includes a housing 20, a power supply side terminal seat 31, a load side terminal seat 32, and a handle 50.

The housing 20 is a member that generally forms the outer shape of the circuit breaker 10. The housing 20 is made of resin. Inside the housing 20, a movable contact 80 and the like, which will be described later, are housed.

The housing 20 is divided into a base 21 and a cover 22. The base 21 is a lower portion in FIG. 1 and is a portion attached to a base (not shown) inside the distribution board. The cover 22 is a portion on the upper side in FIG. 1, and is a portion that covers the base 21 from the side opposite to the base.

The power supply side terminal seat 31 is a portion to which the power supply side wiring (not shown) is connected. As shown by the dotted line in FIG. 1, a part of the left side portion of the housing 20 in FIG. 1 is recessed toward the right side, thereby forming a concave portion 23 which is a concave space. .. The power supply side terminal seat 31 is arranged in the recess 23.

The load-side terminal seat 32 is a portion to which load-side wiring (not shown) is connected. As shown by the dotted line in FIG. 1, a part of the housing 20 on the right side in FIG. 1 is recessed toward the left side, thereby forming a recess 24 which is a concave space. .. The load side terminal seat 32 is arranged in the recess 24.

The handle 50 is a portion operated by the user to switch the opening and closing of the electric circuit. A part of the handle 50 projects outward through an opening (not shown) formed in the cover 22.

When the handle 50 is tilted toward the load side as shown in FIG. 1, the electric path inside the housing 20, that is, the electric path connecting the power supply side terminal seat 31 and the load side terminal seat 41 is open. ing. Therefore, the power supply to the load side wiring is cut off.

When the handle 50 is operated from the state shown in FIG. 1 and the handle 50 is rotated counterclockwise and tilted toward the power supply side, the electric circuit is switched to the closed state. As a result, the electric power from the power supply side wiring is supplied to the load side wiring. Further, when the handle 50 is operated from this state and the handle 50 rotates in the direction opposite to the above to reach the state shown in FIG. 1, the electric circuit is switched to the open state again. As described above, the handle 50 is provided as a member that rotates by an operation for switching the opening and closing of the electric circuit.

As will be described in detail later, the circuit breaker 10 also has a function of detecting an electric leakage when it occurs and automatically cutting off the electric circuit. That is, the circuit breaker 10 has a function as a so-called "earth leakage breaker".

A test button 60 and a display unit 70 are arranged at positions in the circuit breaker 10 near the handle 50. The test button 60 is a part operated by the user in order to test that the function as the earth leakage breaker as described above is normally exhibited. The test button 60 has a substantially cylindrical shape, and a part of the test button 60 projects outward through an opening (not shown) formed in the cover 22, similar to the handle 50 described above. When the user presses the test button 60 in the direction from the base 21 to the cover 22, the trip coil device 100 and the electric circuit opening / closing unit 40, which will be described later, operate and the electric circuit opens, as in the case of an electric leakage. It can be switched to the state. As described above, the test button 60 is a part operated by the user in order to test the operation of the trip coil device 100 and the electric circuit opening / closing part 40, and corresponds to the "test operation part" in the present embodiment. ..

The display unit 70 is a part for displaying whether or not an electric leakage has occurred. The display unit 70 has a substantially cylindrical shape, and like the test button 60 described above, a part thereof projects outward through an opening (not shown) formed in the cover 22. In a normal state where no electric leakage occurs, the amount of protrusion of the display unit 70 is relatively small. On the other hand, when an electric leakage occurs and the electric circuit is switched to the open state, the display unit 70 moves upward in FIG. 1 and the amount of protrusion thereof increases. The user can confirm whether or not an electric leakage has occurred by visually recognizing the display unit 70 from the outside. When the handle 50 is operated to close the electric circuit again after the electric leakage occurs and the electric circuit is switched to the open state, the display unit 70 moves to the lower side in FIG. 1 and returns to the state where the protrusion amount is small.

The internal configuration of the circuit breaker 10 will be described. FIGS. 2 and 3 show the internal configuration when the electric circuit is open. FIG. 4 shows the internal configuration when the electric circuit is closed. In FIGS. 2, 3 and 4, some of the members arranged inside the circuit breaker 10 are not shown.

As shown in FIGS. 2, 3 and 4, a movable contact 80 and a trip coil device 100 are provided inside the circuit breaker 10.

The movable contact 80 rotates inside the circuit breaker 10 to switch between a closed state in contact with the fixed contact 90 (not shown) and an open state in which the movable contact 80 is separated from the fixed contact 90. It is a member for. The movable contact 80 is entirely made of metal. The circuit breaker 10 according to the present embodiment is configured as a three-pole circuit breaker 10. Therefore, as shown in FIG. 5, three movable contacts 80 and three fixed contacts 90 are provided.

When the handle 50 is tilted toward the load side as shown in FIG. 1, the movable contact 80 is in the state shown in FIGS. 2 and 3, and the movable contact 80 and the fixed contact 90 are separated from each other. doing. As a result, the electric circuit inside the circuit breaker 10 is opened.

When the handle 50 is operated and the handle 50 rotates counterclockwise from the state shown in FIG. 1, the movable contact 80 rotates in the direction of the arrow AR1 shown in FIG. 2 and is in the state shown in FIG. In this state, the movable contact 80 and the fixed contact 90 are in contact with each other, and the electric circuit inside the circuit breaker 10 is in a closed state. After that, when the handle 50 is operated and the handle 50 rotates in the direction opposite to the above, the movable contact 80 rotates in the direction of the arrow AR2 in FIG. 4 and returns to the state shown in FIGS.

The movable contact 80 is supported by a separator 82. The separator 82 is made of resin. The separator 82 has a rotating shaft 83, and is held in a rotatable state around the rotating shaft 83. All of the three movable contacts 80 described above are held by the separator 82. Therefore, when the separator 82 rotates around the rotation shaft 83, each of the three movable contacts 80 also rotates together with the separator 82.

When an operation is performed on the handle 50 and the handle 50 rotates, the rotational force is transmitted to the separator 82 via a transmission mechanism (not shown). As a result, the three movable contacts 80 rotate together with the separator 82, and the opening and closing of the electric circuit is switched as described above.

The movable contact 80, the separator 82, and the fixed contact 90 are portions of the circuit breaker 10 that operate to switch the opening and closing of the electric circuit. Hereinafter, these are collectively referred to as "electric circuit opening / closing part 40". Further, the movable contact 80 and the separator 82 correspond to the actually operating "movable part" of the electric path opening / closing part 40.

The trip coil device 100 is a device for operating the electric circuit opening / closing unit 40 so as to be in an open state when an electric leakage occurs. The trip coil device 100 includes a coil 120 and a movable electromagnetic piece 130.

The coil 120 is a coil formed by winding a conducting wire around a bobbin 110. When an electric current flows through the coil 120 and an electromagnetic force is generated, the movable electromagnetic piece 130 described below operates due to the electromagnetic force.

The movable electromagnetic piece 130 operates by the electromagnetic force generated by the coil 120 to operate an opening / closing mechanism (not shown) to switch the electric path opening / closing unit 40 to the open state. Since a known configuration of such an opening / closing mechanism can be adopted, specific illustrations and explanations thereof will be omitted.

A specific circuit configuration for operating the trip coil device 100 will be described with reference to FIG. As shown in the figure, a zero-phase current transformer 210, an amplifier 220, and a switching circuit 230 are provided inside the circuit breaker 10.

The zero-phase current transformer 210 outputs a current corresponding to the balance of the three-phase alternating current in the electric circuit. In FIG. 5, three electric lines connecting the power supply side terminal seat 31 and the load side terminal seat 32 are shown as electric lines 11, 12, and 13, respectively. The electric circuits 11, 12, and 13 are all arranged so as to pass through the inside of the zero-phase current transformer 210. When no electric leakage has occurred, the three-phase alternating current passing through the electric circuits 11, 12, and 13 is balanced, so that the current output from the zero-phase current transformer 210 is approximately zero. On the other hand, when an electric leakage occurs, the above balance is lost, so that the current output from the zero-phase current transformer 210 becomes large.

The amplifier 220 amplifies the current output from the zero-phase current transformer 210 and inputs this to the switching circuit 230. The "current output from the zero-phase current transformer 210" can also be said to be a signal indicating the occurrence of electric leakage.

The switching circuit 230 is a circuit configured to pass a current through the coil 120 when the value of the current input from the amplifier 220 exceeds a predetermined value. When a current flows through the coil 120, as described above, the movable electromagnetic piece 130 operates and the electric circuit opening / closing portion 40 is switched to the open state.

Wiring 14 and 15 are connected to the switching circuit 230. The wiring 14 is a wiring connecting the electric circuit 11 and the switching circuit 230. The wiring 15 is a wiring connecting the electric circuit 13 and the switching circuit 230. The switching circuit 230 operates by receiving electric power supplied through the wirings 14 and 15.

The electric circuit 11 and the electric circuit 13 are connected to each other via the wiring 16. A terminal resistor 150 and a test switch 140 are arranged in the middle of the wiring 16. In FIGS. 2 and 5, the reference numeral "151" is attached to the end of the wiring 16 extending from the terminal resistor 150. Hereinafter, the said portion is also referred to as “end portion 151”.

The test switch 140 is a leaf spring whose entire body is made of metal. As shown in FIG. 2 and the like, one end of the test switch 140 is attached to the bobbin 110. When the circuit breaker 10 is viewed in the direction from the cover 22 toward the base 21, that is, in the vertical direction of FIG. 1, the test button 60 is arranged at a position overlapping the test switch 140. Further, the rear end of the test button 60 is in contact with the test switch 140.

In the normal state when the test button 60 is not pressed, the test switch 140 and the end portion 151 are separated from each other, and the test switch 140 is in the open state. When the test button 60 is pressed, the force from the test button 60 deforms the test button 60, which is a leaf spring. As a result, a part of the test button 60 comes into contact with the end portion 151, and the test switch 140 is closed.

Such a test switch 140 can be said to be a switch that switches to a closed state by operating the test button 60, which is a test operation unit. In the present embodiment, the test switch 140 is attached to a member constituting the trip coil device 100, specifically, a bobbin 110, whereby the test switch 140 is integrated with the trip coil device 100. With such a configuration, the work of attaching the test switch 140 can be simplified.

When the test button 60 is operated and the test switch 140 is closed, the balance of the three-phase alternating current passing through the electric circuits 11, 12, and 13 is lost, that is, the same state as when an electric leakage occurs. Therefore, if the trip coil device 100 and the electric circuit opening / closing unit 40 are normal, they operate in the same manner as in the case of electric leakage, and the electric circuit is switched to the open state.

In the state where the power supply side wiring is connected to the power supply side terminal seat 31 side and the load side wiring is connected to the load side terminal seat 32 side, that is, in the forward connection state, when the electric circuit opening / closing part 40 is opened, the switching circuit Power is no longer supplied to the 230 and the trip coil device 100. Therefore, even if the test button 60 is pressed and the test switch 140 is closed in this state, no current flows through the coil 120.

On the other hand, in the state where the load side wiring is connected to the power supply side terminal seat 31 side and the power supply side wiring is connected to the load side terminal seat 32 side, that is, in the reverse connection state, the electric circuit opening / closing portion 40 is in the open state. Even after that, power is supplied to the switching circuit 230 and the trip coil device 100. Therefore, when the test button 60 is pressed and the test switch 140 is closed in this state, a current continuously flows through the coil 120. As a result, the coil 120 may burn out.

As a configuration for preventing the coil 120 from burning during reverse connection as described above, for example, a configuration in which a switch is provided at the position of the dotted line DL in the middle of the wiring 15 can be considered. If the switch is also configured to be in the open state when the electric circuit opening / closing unit 40 is in the open state, power will not be supplied to the switching circuit 230 and the trip coil device 100. Such burning of the coil 120 does not occur.

However, in the configuration in which the switch is separately provided for the purpose of protecting the coil 120, the number of parts increases and the man-hours for mounting the switch increase, which is not preferable from the viewpoint of cost.

Therefore, the circuit breaker 10 according to the present embodiment is configured to surely prevent the coil 120 from being burnt out without providing the above-mentioned switch.

As shown in FIG. 2 and the like, the regulation rib 160 is arranged at a position in the circuit breaker 10 near the trip coil device 100. The regulation rib 160 is an elongated rod-shaped member. The regulation rib 160 is arranged so that its longitudinal direction is along the direction in which the test button 60 is pressed, that is, the vertical direction in FIGS. 1 and 2. The regulation rib 160 is held in a movable state along the longitudinal direction (vertical direction in FIG. 2) by a structural member arranged around the regulation rib 160.

As shown in FIGS. 2 and 3, when the electric circuit opening / closing portion 40 is in the open state, one end (lower end in FIG. 2) of the regulation rib 160 comes into contact with the separator 82 which is a movable portion. ing. Further, the other end (upper end in FIG. 2) of the regulation rib 160 projects further toward the test switch 140 side than the end portion 151.

Therefore, when the user tries to press the test button 60 while the electric circuit opening / closing portion 40 is in the open state, the test switch 140 hits the regulation rib 160 before contacting the end portion 151. It touches and cannot move to the end 151 side any more. That is, the regulation rib 160 prevents the user from pressing the test button 60 to test the operation of the trip coil device 100 and the like. Since the test switch 140 is surely prevented from being closed, the coil 120 does not burn out as described above even when the test switch 140 is reversely connected.

On the other hand, as shown in FIG. 4, when the electric circuit opening / closing portion 40 is in the closed state, there is a gap between one end of the regulation rib 160 (lower end in FIG. 2) and the separator 82 which is a movable portion. Is formed. Therefore, in this state, when the user tries to press the test button 60, the regulation rib 160 moves to the separator 82 side by the force from the pressed test switch 140. In this case, since the movement of the test switch 140 is not hindered by the regulation rib 160, the test switch 140 is finally in contact with the end portion 151, that is, the test button 60 is completely pressed. ..

As described above, the circuit breaker 10 according to the present embodiment is an operation prevention that prevents the test button, which is a test operation unit, from being operated when the electric circuit opening / closing unit 40 is in the open state. It has a mechanism. In the present embodiment, the regulation rib 160 and the peripheral members supporting the regulation rib 160 correspond to the above-mentioned "operation prevention mechanism".

The regulation rib 160 regulates the operation of the test button 60 along the pressing direction when the electric circuit opening / closing portion 40 is in the open state. Specifically, the regulation rib 160 is in contact with the separator 82, which is a movable portion, when the electric circuit opening / closing portion 40 is in the open state, thereby hindering the operation of the test switch 140. The operation of the test button 60 is regulated.

The specific configuration of the operation prevention mechanism is not limited to the modes described above, and various modes can be adopted. For example, the movement of the regulating rib 160 when the electric circuit opening / closing portion 40 is in the open state is not regulated by the contact with the separator 82, but is regulated by the contact with the movable contact 80. May be good.

Further ingenuity in the operation prevention mechanism will be described. FIG. 6 shows the configuration of the regulation rib 160 and its surroundings when the electric circuit opening / closing portion 40 is in the closed state. In the figure, each component is cut along a surface including the central axis of the display unit 70.

As shown in FIG. 6, a flat plate portion 71, an arm portion 72, and a protrusion 73 are formed on the lower side of the display portion 70, that is, on the movable contact 80 side. All of these are made of resin, and together with the display unit 70, the whole is formed as an integral member.

The flat plate portion 71 is a portion formed in a substantially flat plate shape. The flat plate portion 71 is arranged so that the normal direction of the main surface thereof is along the moving direction of the movable electromagnetic piece 130. The flat plate portion 71 is formed with an opening 710 so as to penetrate the flat plate portion 71 along the normal direction. A movable electromagnetic piece 130 is inserted through the opening 710.

The arm portion 72 is a rod-shaped portion of the flat plate portion 71 formed so as to extend further toward the movable contact 80 side from the end portion on the movable contact 80 side. The protrusion 73 is a portion formed so as to project from the tip of the flat plate portion 71 toward the separator 82 side.

As described above, the amount of protrusion of the display unit 70 from the cover 22 is relatively small in the normal state where no electric leakage occurs. As shown in FIG. 6, the position of the display unit 70 at this time is a position that is an end portion on the movable contact 80 side in the movable range.

At this time, the display unit 70 is urged toward the cover 22 side by the springs 75 shown in FIGS. 2, 3, and 4. However, since the display unit 70 is held by a lock mechanism (not shown), the position of the display unit 70 does not change.

When an electric leakage occurs and the trip coil device 100 operates, the lock mechanism is released. The display unit 70 moves toward the cover 22 side by the urging force of the spring 75. As a result, the amount of protrusion of the display unit 70 increases.

After that, when the handle 50 is operated by the user, the separator 82 and the movable contact 80 rotate in the direction indicated by the arrow AR1 in FIG. 2 and the like. At this time, when the protrusion 84 (see FIGS. 3 and 4) formed on the side surface of the separator 82 hits the protrusion 73, the display unit 70 is pulled down in the direction away from the cover 22. As a result, the protruding amount of the display unit 70 is returned to the normal protruding amount.

As shown in FIG. 6, a protrusion 74 protruding toward the regulation rib 160 side is formed on the surface of the flat plate portion 71 on the regulation rib 160 side. Further, a groove 161 that retracts in a concave shape is formed on the surface of the regulation rib 160 on the flat plate portion 71 side. The protrusion 74 is stretched inside the groove 161. The groove 161 is formed so as to extend along the longitudinal direction of the regulation rib 160. However, the range in which the groove 161 is formed along the longitudinal direction is not the entire regulation rib 160 but only a part of the regulation rib 160. With such a configuration, the groove 161 defines the movable range of the regulation rib 160.

The regulating rib 160 can be further moved from the state shown in FIG. 6 toward the movable contact 80 side (lower side in FIG. 6). When the protrusion 74 comes into contact with the end surface 162 of the groove 161 on the cover 22 side, the regulation rib 160 cannot move further to the movable contact 80 side. Even when the regulation rib 160 moves to the most movable contact 80 side in the movable range, when the electric circuit opening / closing portion 40 is in the closed state as shown in FIG. 6, the regulation rib 160 hits the separator 82. There is no contact, and a gap is formed between the two.

After that, when an electric leakage occurs and the electric circuit opening / closing portion 40 is switched to the open state, the separator 82 and the movable contact 80, which are movable portions, start to rotate in the direction indicated by the arrow AR2 in FIG. Further, as described above, the display unit 70 starts to move toward the cover 22 side.

At this time, since the protrusion 74 comes into contact with the end surface 162 of the groove 161, the regulation rib 160 also moves to the cover 22 side together with the display portion 70. The movement of such a regulation rib 160 is faster than the movement of the separator 82 and the movable contact 80 described above. Therefore, at least while the separator 82 and the movable contact 80 are operating, the lower end of the regulation rib 160 does not come into contact with the separator 82.

If the lower end of the regulation rib 160 is configured to hit the separator 82 during operation, a large impact is applied to the regulation rib 160 due to the contact with the separator 82. Further, the direction of the force applied from the separator 82 to the regulation rib 160 during the rotational operation is not the direction along the moving direction of the regulation rib 160. Therefore, there is a concern that the regulation rib 160 may be deformed or damaged by the impact received from the separator 82.

On the other hand, in the present embodiment, as described above, when the electric circuit opening / closing portion 40 is switched from the closed state to the open state, the regulation rib 160 is covered in advance so as not to come into contact with the moving portion during operation. It is supposed to move toward the 22 side (which can be said to be the test button 60 side). Such movement of the regulation rib 160 is realized by the protrusion 74 formed on the flat plate portion 71 and the groove 161 formed on the regulation rib 160. The protrusion 74 and the groove 161 correspond to a “retract mechanism” for moving the regulation rib 160 to the test button 60 side in advance. By providing such a retracting mechanism, damage to the regulation rib 160 as described above can be prevented.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

10: Circuit breaker 40: Electric circuit opening / closing part 60: Test button 100: Detachable coil device 160: Regulatory rib

Claims (5)

It ’s a circuit breaker,
An electric circuit opening / closing part that operates to switch the opening / closing of the electric circuit,
A trip coil device that operates the electric circuit opening / closing part so that it is opened when an electric leakage occurs.
A test operation unit operated by a user to test the operation of the trip coil device and the electric circuit opening / closing unit is provided.
A circuit breaker further provided with an operation prevention mechanism for preventing the test operation unit from being operated when the electric circuit opening / closing unit is in the open state. The test operation unit is a test button pressed by the user.
The circuit according to claim 1, wherein the operation prevention mechanism has a regulating rib that regulates the operation of the test button along the pressing direction when the electric circuit opening / closing portion is in the open state. Circuit breaker. The electric circuit opening / closing part has a movable part, and has a movable part.
The circuit breaker according to claim 2, wherein the regulation rib regulates the operation of the test button by being in contact with the movable portion when the electric circuit opening / closing portion is in the open state. When the electric circuit opening / closing part is switched from the closed state to the open state,
The circuit breaker according to claim 3, further comprising a retracting mechanism for preliminarily moving the regulating rib to the test button side so that the regulating rib does not come into contact with the moving portion during operation. The circuit breaker according to any one of claims 1 to 4, wherein a test switch that switches to a closed state by operating the test operation unit is attached to a member constituting the trip coil device. ..

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