JP2012138263A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit breaker in which a determination can be made easily whether the circuit breaker is opened by a tripping device for confirming operation that is operated by an external signal, or opened by the intended circuit protection function of the circuit breaker.SOLUTION: The circuit breaker comprises a switching contact for switching an electric circuit, an overcurrent tripping device which trips the switching contact that is in closed state when a current higher than a predetermined value flows through the electric circuit, a tripping device for confirming operation that brings the switching contact in closed state into open state regardless of the tripping by the overcurrent tripping device, and an operation display section which displays the fact that the tripping device for confirming operation is driven.

Description

  The present invention relates to a circuit breaker that opens and protects an electric circuit in response to an overcurrent or a leakage, and more particularly to a circuit breaker having an operation display function.

  2. Description of the Related Art Conventionally, as a circuit breaker installed for electric circuit protection, there is a circuit breaker provided with a tripping device that can open a circuit breaker by an external signal (see, for example, Patent Document 1). . Conventionally, there is an earth leakage test apparatus in which an earth leakage test of an earth leakage breaker is confirmed by operating a remote test switch (see, for example, Patent Document 2).

JP 2006-92782 A JP-A-8-106844

  In the conventional circuit breaker as shown in Patent Document 1, when the tripping device is operated by a signal from the outside with the circuit breaker opened, the operation of the circuit breaker is confirmed. It cannot be easily determined whether the circuit breaker has been opened by the disconnecting device, or whether the circuit breaker has been opened by detecting the overload current, short circuit current, leakage current, or the like. In addition, even in the earth leakage breaker as shown in Patent Document 2, when the operation of the earth leakage breaker is confirmed by the remote test switch, it is detected whether the circuit has been opened by the remote test switch or the leakage current is detected. There was a problem that it was not possible to easily determine whether the circuit was opened by the circuit protection function.

  The present invention has been made to solve the above-mentioned problems in the conventional circuit breaker, and whether the circuit breaker has been opened by the trip device for operation confirmation operated by an external signal or not. It is an object of the present invention to obtain a circuit breaker that can easily determine whether the circuit has been opened by the original circuit protection function.

  The circuit breaker according to the present invention includes an open / close contact that opens and closes an electric circuit, an overcurrent trip device that trips the open / close contact that is closed when a current of a predetermined value or more flows through the electric circuit, and an external signal. The trip check device for operation check that opens the open / close contact in the closed state and the trip device for operation check are driven regardless of the trip by the overcurrent trip device. And an operation display unit for displaying the fact.

  The circuit breaker according to the present invention is based on an open / close contact that opens and closes an electric circuit, an earth leakage trip device that trips the open / close contact that is closed when a leakage current flows through the electric circuit, and an external signal. Regardless of the trip by the earth leakage trip device, the trip check device for operation confirmation that opens the open / close contact in the closed state and the trip device for operation confirmation are driven. An operation display unit for displaying is provided.

  According to the circuit breaker according to the present invention, the trip device for confirming the operation for opening the open / close contact in the closed state regardless of the trip by the overcurrent trip device driven based on the external signal, An operation display unit for displaying that the trip device for operation confirmation is driven, so that the circuit breaker is opened by the trip device for operation confirmation operated by an external signal or the circuit breaker It is possible to easily determine whether the circuit is opened by the original circuit protection function.

  Further, according to the circuit breaker of the present invention, the trip device for operation confirmation that opens the open / close contact in the closed state regardless of the trip by the leakage trip device driven based on the external signal. And an operation display unit for displaying that the trip device for operation confirmation is driven, so that the circuit breaker is opened by the trip device for operation confirmation operated by an external signal. It is possible to easily determine whether the circuit has been opened by the original circuit protection function.

It is a perspective view which shows the circuit breaker by Embodiment 1 of this invention. It is a circuit diagram of the trip device in the circuit breaker according to Embodiment 1 of the present invention. It is a perspective view which shows the circuit breaker by Embodiment 2 of this invention. It is a perspective view which shows the circuit breaker by Embodiment 3 of this invention. It is a perspective view which shows the circuit breaker by Embodiment 4 of this invention. It is a circuit diagram of a circuit breaker and its leakage test apparatus according to Embodiment 4 of the present invention.

Embodiment 1 FIG.
A circuit breaker according to Embodiment 1 of the present invention will be described below. FIG. 1 is a perspective view of a circuit breaker 1 according to Embodiment 1 of the present invention. In FIG. 1, the circuit breaker 1 includes an operation confirmation tripping device (hereinafter simply referred to as a tripping device) 2 mounted on an outer surface of a casing 100 including a base 101 and a cover 102. . The circuit breaker 1 shown here is a three-phase circuit breaker connected to a three-phase circuit, but may be other circuit breakers.

  Although not shown in the figure, the circuit breaker 1 includes an open / close contact comprising a fixed contact and a movable contact for opening / closing the electric circuit, an operation mechanism for opening / closing the open / close contact by operating the operation handle, and an electric circuit having a predetermined value or more. And an overcurrent tripping device that releases the open / close contact in the closed state when the overcurrent flows.

  The trip device 2 includes a circuit to be described later, and energizes the shunt coil of the circuit breaker 1 by closing a trip switch 8 provided at a remote location with respect to the circuit breaker 1, for example. The trip mechanism can be operated to open the circuit.

  The tripping device 2 includes three input terminals 3, 4, and 5, and an operation indicator lamp 6 composed of a light emitting diode. One end of an AC power source 7 as a control power source for operating the tripping device 2 is connected to the input terminal 5 of the tripping device 2 and the other end is connected to the input terminal 4 of the tripping device 2. The other end of the AC power source 7 is connected to the input terminal 3 of the trip device 2 via the trip switch 8 described above.

  FIG. 2 is a circuit diagram of the tripping device in the circuit breaker according to Embodiment 1 of the present invention. In FIG. 2, the first power conversion circuit 201 formed of a converter has an input side terminal connected to the input terminals 4 and 5 of the trip device 2 via a resistor. Similarly, the second power conversion circuit 202 formed of a converter has an input side terminal connected to the input terminals 3 and 4 of the trip device 2 via a resistor. The first power conversion circuit 201 and the second power conversion circuit 202 each convert AC power from the AC power source 7 into DC power, and output the DC power from the output side terminals via the constant voltage elements 203 and 204, respectively.

  The operation indicator lamp 6 as the operation display unit is connected between the output terminals of the first power conversion circuit 201 via the first thyristor 55. The gate of the first thyristor 55 is connected to the collector of the first transistor 205 via a resistor. The emitter of the first transistor 205 is connected to the positive terminal of the first power conversion circuit 201 via the second transistor 206, and the collector is connected to the negative terminal of the first power conversion circuit 201 via a resistor. And grounded. The base of the first transistor 205 is connected to the output terminal of the photocoupler 51 via a resistor.

  The capacitor 207 is connected between the output terminals of the first power conversion circuit 201 via the second transistor 206, and is charged to a predetermined voltage by the output of the first power conversion circuit 201. The reset switch 43 is connected to the base of the second transistor 206 and closes to turn off the second transistor 206. The input terminal of the photocoupler 51 described above is connected between the output terminals of the second power conversion circuit 202 via the third transistor 208. The second thyristor 56 is connected in series to the shunt coil 103 that trips the circuit breaker 1.

  In the circuit breaker according to the present invention configured as described above, it is assumed that the circuit breaker 1 is in an ON state and its movable contact is in contact with the fixed contact to close the electric circuit to be protected. At this time, AC power from the AC power supply 7 is converted into DC power by the first power conversion circuit 201 and supplied to the capacitor 207 via the second transistor 206, and the capacitor 207 is charged to a predetermined voltage. It is in the state. The second transistor 206 is turned off when the capacitor 207 is charged to a predetermined voltage.

  On the other hand, the second power conversion circuit 202 is inoperative because the trip switch 8 connected to the trip device 2 is open, and no DC power is output between its output terminals. Therefore, the photocoupler 51 is inoperative, the second thyristor 56 is non-conductive because the photocoupler 51 is off and no gate signal is applied, and the shunt coil 103 of the circuit breaker 1 is in the de-energized state. It is in.

  Furthermore, since the photocoupler 51 is inoperative, the first transistor 205 is off, the first thyristor 55 is not supplied with a gate signal, and is in a non-conductive state, and is an operation indicator light composed of a light emitting diode. 6 is turned off. Therefore, it can be confirmed that the tripping device 2 is not in operation because the operation indicator lamp 6 is turned off. Moreover, it can be confirmed that the circuit breaker 1 is in the ON state by the operation handle being in the ON position.

  The circuit breaker 1 can be switched from an on-state to an off-state or from an off-state to an on-state by an operation mechanism (not shown), and is shown when an overcurrent flows in the electric circuit. No trip mechanism can be used to turn off and protect the circuit. The normal switching operation of the circuit breaker 1 and the trip operation due to overcurrent are performed irrespective of the operation of the trip device 2, and the operation indicator lamp 6 indicating the operation of the trip device 2 remains off. is there. Therefore, if the operation handle of the circuit breaker 1 is in the off position or the trip position when the operation indicator lamp 6 is not lit, it is determined that the circuit breaker 1 is in the off state or the trip state due to its original function. Is possible.

  Next, for example, when the trip switch 8 is closed for the purpose of testing the function of the circuit breaker 1, the AC power supply 7 is connected to the second power conversion circuit 202. As a result, the second power conversion circuit 202 converts AC power from the AC power source 7 into DC power and outputs DC power between its output terminals. The third transistor 208 is turned on in response to DC power generated between the output terminals of the second power conversion circuit 202, and the photocoupler 51 is turned on. As a result, the second thyristor 56 is turned on when a gate signal is applied, the shunt coil 103 of the circuit breaker 1 is energized, and the circuit breaker 1 is turned off.

  On the other hand, when the photocoupler 51 is turned on, the first transistor 205 is turned on, and the first thyristor 55 is moved by being given a gate signal through the first transistor. As a result, the operation indicator lamp 6 is turned on. Accordingly, if the operation handle of the circuit breaker 1 is in the trip position when the operation indicator lamp 6 is lit, it is possible to determine that the circuit breaker 1 is tripped by the operation of the trip device 2. is there.

  The trip switch 8 is constituted by a normally-off type self-returning switch, and is automatically turned off when the pressing force disappears after being turned on by being pressed by an operator. Therefore, the output generation period of the second power conversion circuit 202 is short, and the photocoupler 51 is turned on only in a short time. However, as soon as the photocoupler 51 is turned on, the gate is connected to the gate of the second thyristor 56. Given the signal, the second thyristor 56 is moved and the circuit breaker 1 trips.

  When the photocoupler 51 is turned on, the first thyristor 55 is moved and the operation indicator lamp 6 is turned on as described above. However, when the photocoupler 51 is turned off, the first transistor 205 is immediately turned off. Thus, no gate signal is applied to the gate of the first thyristor 55. However, even if the first thyristor 55 is once turned on and no longer receives a gate signal, the first thyristor 55 is not turned off unless the current flowing through the first thyristor 55 becomes zero. In other words, after the first thyristor 55 is turned on once the gate signal is applied, the continuity of the first thyristor 55 is maintained and the operation indicator lamp 6 is continuously turned on.

  To turn off the lit operation indicator lamp 6, the reset switch 43 is turned on. That is, when the reset switch 43 is turned on, the second transistor 206 is turned off, and the current flowing through the first thyristor 55 becomes zero. Therefore, the first thyristor 55 is turned off and the operation indicator lamp 6 is turned off. To do.

  As described above, according to the circuit breaker according to the first embodiment of the present invention, whether the circuit breaker is opened by the tripping device operated by the signal from the outside, or by the original circuit protection function of the circuit breaker. It is possible to easily determine whether the circuit has been opened.

Embodiment 2. FIG.
Next, a circuit breaker according to Embodiment 2 of the present invention will be described. FIG. 3 is a perspective view showing a circuit breaker according to Embodiment 2 of the present invention. In FIG. 3, the circuit breaker 11 differs from the circuit breaker according to the first embodiment in that it incorporates an operation check trip device (hereinafter simply referred to as a trip device) 12. The tripping device 12 includes input lines 13, 14, and 15 connected to input terminals (not shown), respectively, and an operation indicator lamp 16 as an operation display unit configured by a light emitting diode.

  One end of an AC power source 17 serving as a control power source for operating the trip device 2 is connected to one input terminal of the trip device 12 via an input line 15, and the other end is connected via an input line 14. It is connected to another input terminal of the removing device 2. The other end of the AC power supply 17 is connected to another input terminal of the trip device 12 via a trip switch 18 and an input line 13. Other configurations and operations are the same as those of the circuit breaker according to the first embodiment.

  As described above, according to the circuit breaker according to the second embodiment of the present invention, whether the circuit breaker has been opened by the tripping device that operates in response to an external signal or the original circuit protection function of the circuit breaker. It is possible to easily determine whether the circuit has been opened.

  Furthermore, according to the circuit breaker according to Embodiment 2 of the present invention, since the tripping device 12 is built in the circuit breaker 11, the projected area of the circuit breaker does not increase.

Embodiment 3 FIG.
Next, a circuit breaker according to Embodiment 3 of the present invention will be described. FIG. 4 is a perspective view of a circuit breaker according to the third embodiment. In FIG. 4, a circuit breaker 21 differs from the circuit breaker according to the first embodiment in that a tripping device for operation confirmation (hereinafter simply referred to as a tripping device) 22 is incorporated, and the tripping device is tripped. The circuit breaker differs from the circuit breakers according to the first and second embodiments in that the device 22 includes a mechanical operation display device 26 as an operation display unit.

  The tripping device 22 includes input lines 23 and 25 connected to input terminals (not shown) of the tripping device 22 and the mechanical operation display device 26 described above. The mechanical operation display device 26 is configured so that the display button protrudes when the tripping device 22 is operated, and for example, the protrusion position is self-held until it is manually returned to the original position. A control power source 27 for operating the tripping device 22 and a tripping switch 28 are connected in series to the input lines 23 and 25 of the tripping device 22.

  As described above, according to the circuit breaker according to the third embodiment of the present invention, the trip device 22 includes the mechanical operation display device 26 in which the display button protrudes when the trip device 22 operates. Therefore, it is possible to eliminate the need for the control power supply for self-holding the operation indicator light required by the circuit breakers according to the first and second embodiments, and simplify the wiring of the tripping device 22. Can do.

  Further, according to the circuit breaker according to the third embodiment of the present invention, whether the circuit breaker is opened by the trip device operated by the signal from the outside or whether the circuit breaker is opened by the original circuit protection function of the circuit breaker. It can be easily distinguished.

  Furthermore, according to the circuit breaker according to Embodiment 3 of the present invention, since the tripping device 22 is built in the circuit breaker 12, the projected area of the circuit breaker does not increase.

Embodiment 4 FIG.
Next, a circuit breaker according to Embodiment 2 of the present invention will be described. FIG. 5 is a perspective view showing a circuit breaker according to Embodiment 4 of the present invention. The circuit breaker according to the fourth embodiment is an earth leakage breaker capable of detecting an electric leakage and interrupting an electric circuit, but is simply referred to as a circuit breaker in the following description.

  The circuit breaker 31 includes a leakage test device 32 mounted on the outer surface of the casing 300 including the base 301 and the cover 302. The circuit breaker 31 shown here is a three-phase circuit breaker connected to a three-phase circuit, but may be other circuit breakers. The leakage test device 32 as an operation check trip device includes a circuit to be described later, and, for example, by closing a remote test switch 38 provided at a remote location with respect to the circuit breaker 31, as described later. A pseudo leakage current is allowed to flow through the circuit breaker 31 to operate the trip mechanism of the circuit breaker 31 and open the electric circuit.

  The leakage test device 32 includes three input terminals 33, 34, and 35, and an operation indicator lamp 36 composed of a light emitting diode. An AC power source 37 as a control power source for operating the leakage test device 32 has one end connected to the input terminal 35 of the leakage test device 32 and the other end connected to the input terminal 34 of the leakage test device 32. The other end of the AC power source 37 is connected to the input terminal 33 of the leakage test device 32 via the remote test switch 38 described above.

  FIG. 6 is a circuit diagram of a circuit breaker and its leakage test apparatus according to Embodiment 4 of the present invention. In FIG. 6, the first power conversion circuit 311 formed of a converter has an input side terminal connected to input terminals 34 and 35 of the leakage test device 32 via a resistor. Similarly, the second power conversion circuit 312 made of a converter has its input side terminal connected to the input terminals 33 and 34 of the leakage test device 32 via a resistor. The first power conversion circuit 311 and the second power conversion circuit 312 each convert AC power from the AC power source 37 into DC power, and output the DC power from the output side terminals via the constant voltage elements 313 and 314, respectively.

  The operation indicator lamp 36 as an operation display unit is connected between the output terminals of the first power conversion circuit 311 via the thyristor 45. The gate of the thyristor 45 is connected to the collector of the first transistor 315 via a resistor. The emitter of the first transistor 315 is connected to the positive terminal of the first power conversion circuit 311 via the second transistor 316, and the collector is connected to the negative terminal of the first power conversion circuit 311 via a resistor. Has been. The base of the first transistor 315 is connected to the negative terminal of the first power conversion circuit 311 via the resistor and the second photocoupler 42.

  The capacitor 318 is connected between the output terminals of the first power conversion circuit 311 via the second transistor 316, and is charged to a predetermined voltage by the output of the first power conversion circuit 311. The reset switch 43 is connected to the base of the second transistor 316 and closes to turn off the second transistor 316. The input terminal of the first photocoupler 41 is connected between the output terminals of the second power conversion circuit 312 via the third transistor 319. The output terminal of the first photocoupler 41 is connected to the input terminal of the second photocoupler 42.

  Next, a circuit breaker 31 configured as an earth leakage breaker includes a zero-phase current transformer 320 including a secondary winding 322 and a tertiary winding 323 that surround a main circuit conductor 321 as a primary conductor; , A leakage detection circuit 324 that detects leakage of the main circuit conductor 321 from the output of the secondary winding 322 of the zero-phase current transformer 320, a fourth transistor 325 that is turned on by the output of the leakage detection circuit 324, The release relay 326 connected in series to the fourth transistor 325, the fifth transistor 327 connected in series to the tertiary winding 323 of the zero-phase current transformer 320, and the base of the fifth transistor 327. A leakage test circuit 44 and a leakage test switch 328 connected to the leakage test circuit 44 are provided.

  The output terminal of the first photocoupler 41 and the input terminal of the second photocoupler 42 provided in the leakage test device 32 are connected in series and connected in parallel to the leakage test switch 328 of the circuit breaker 31. .

  The circuit breaker 31 is provided with a power supply circuit 329 for converting AC power from the main circuit conductor 321 to DC power and outputting the DC power. From the power supply circuit 329, the above-described leakage detection circuit 324 and release relay 325 are provided. The DC power is supplied to the input terminals of the fifth transistor 327 and the second photocoupler 42.

  In the circuit breaker according to the fourth embodiment of the present invention configured as described above, the circuit breaker 31 is now in the ON state, and its movable contact contacts the fixed contact to close the electric circuit to be protected. And At this time, AC power from the AC power source 37 is converted into DC power by the first power conversion circuit 311 and supplied to the capacitor 318 via the second transistor 316, and the capacitor 318 is charged to a predetermined voltage. It is in the state. The second transistor 316 is turned off when the capacitor 318 is charged to a predetermined voltage.

  On the other hand, the second power conversion circuit 312 is inoperative because the remote test switch 38 connected to the leakage test device 32 is open, and DC power is not output between its output terminals. Accordingly, the first photocoupler 41 is inoperative and the second photocoupler 42 is off. Therefore, the first transistor 315 is off and the thyristor 45 is non-conductive.

  Further, since the thyristor 45 is non-conductive, the operation indicator lamp 36 constituted by a light emitting diode is turned off. Therefore, it is possible to confirm that the leakage test device 32 is inoperative by the operation indicator lamp 36 being turned off. Further, it can be confirmed that the circuit breaker 31 is in the ON state by the operation handle being in the ON position.

  The circuit breaker 31 can be switched from an on-state to an off-state or from an off-state to an on-state by an operation mechanism (not shown), and when a leakage current flows in the electric circuit, the circuit breaker 31 is not shown. No trip mechanism can be used to turn off and protect the circuit. The normal switching operation of the circuit breaker 31 and the trip operation due to the leakage current are performed regardless of the operation of the leakage test apparatus 32, and the operation indicator lamp 36 indicating the operation of the leakage test apparatus 32 remains off. is there. Therefore, if the operation handle of the circuit breaker 31 is in the off position or the trip position when the operation indicator lamp 36 is not lit, it is determined that the circuit breaker 31 is in the off state or the trip state depending on its original function. Is possible.

  Next, assuming that the remote test switch 38 is closed for the purpose of testing the function of the circuit breaker 31, for example, the AC power source 37 is connected to the second power conversion circuit 312. As a result, the second power conversion circuit 312 converts AC power from the AC power source 37 into DC power, and outputs DC power between its output terminals. The third transistor 319 is turned on in response to the DC power generated between the output terminals of the second power conversion circuit 312, and the first photocoupler 41 is turned on. As a result, the second photocoupler 42 is turned on, the leakage test circuit 44 of the circuit breaker 1 is energized, and the fifth transistor 327 is turned on.

  When the fifth transistor 327 is turned on, a pseudo zero-phase current flows in the tertiary winding 323 of the zero-phase current transformer 320, and the secondary winding 322 and the leakage detection circuit 324 respond to this to output. Occurs and the fourth transistor 325 is turned on. As a result, the release relay 326 operates to cause the circuit breaker 31 to trip.

  On the other hand, when the first photocoupler 41 is turned on, the second photocoupler 42 is turned on and the first transistor 315 is turned on. Thereby, the thyristor 45 is moved by being given a gate signal through the first transistor. As a result, the operation indicator lamp 36 is turned on. Therefore, if the operation indicator lamp 36 is lit and the operation handle of the circuit breaker 1 is in the trip position, the circuit breaker 1 can be determined to be tripped due to the operation of the leakage test device 32. is there.

  The remote test switch 38 is constituted by a self-returning switch that is always off, and after being turned on by being pressed by an operator, the remote test switch 38 is automatically turned off when the pressing force disappears. Therefore, the output generation period of the second power conversion circuit 312 is short, and the first photocoupler 41 is turned on only in a short period of time. However, as soon as the first photocoupler 41 is turned on, the second photocoupler 41 is turned on. The photocoupler 42 is turned on, whereby the first transistor 315 is turned on, a gate signal is applied to the gate of the thyristor 319, the thyristor 319 becomes conductive, and the circuit breaker 31 trips as described above.

  When the first photocoupler 41 is turned on, the thyristor 319 is moved and the operation indicator lamp 36 is turned on as described above. However, if the first photocoupler 41 is turned off, the second photocoupler is turned on. 42 is immediately turned off, so the first transistor 315 is immediately turned off, and the gate signal is not applied to the gate of the thyristor 319. However, even if the thyristor 319 once becomes conductive, the gate signal is not applied, but the thyristor 319 does not become non-conductive unless the current flowing through the thyristor 319 becomes zero. That is, after the thyristor 319 is turned on once the gate signal is applied, the thyristor 319 is self-maintained and the operation indicator lamp 36 is continuously turned on.

  To turn off the lit operation indicator lamp 36, the reset switch 43 is turned on. That is, when the reset switch 43 is turned on, the second transistor 318 is turned off and the current flowing through the thyristor 45 becomes zero, so that the thyristor 45 becomes non-conductive and the operation indicator lamp 36 is turned off.

  As described above, according to the circuit breaker according to the fourth embodiment of the present invention, whether the circuit breaker has been opened by the leakage test device that operates in response to an external signal, or by the original circuit protection function of the circuit breaker. It is possible to easily determine whether the circuit has been opened.

  In the first, second, and fourth embodiments, the same effect can be obtained as a mechanical operation display device instead of the operation indicator lamp 6. In this case, a control power supply for self-holding the operation indicator lamp can be eliminated, and the wiring of the tripping device 22 can be simplified.

1, 11, 21, 31 Circuit breaker 101, 301 Base 102, 302 Cover 2, 12, 22 Trip device 8, 18, 28 Trip switch 3, 4, 5, 33, 34, 35 Input terminal 7, 17 , 27, 37 AC power supply
201, 311 First power conversion circuit 202, 312 Second power conversion circuit 203, 204, 313, 314 Constant voltage element 55 First thyristor 205, 315 First transistor 206, 316 Second transistor 51 Photocoupler 207, 318 Capacitor 43 Reset switch 208 Third transistor 56 Second thyristor 103 Shunt coil 6, 16, 36 Operation indicator lamps 13, 14, 15 Input line 26 Operation indicator 38 Remote test switch 32 Earth leakage test device 45 Thyristor 41 First photocoupler 42 Second photocoupler 312 Main circuit conductor 320 Zero-phase current transformer 322 Secondary winding 323 Tertiary winding 324 Leakage detection circuit 325 Fourth transistor 327 Fifth transistor 44 Leakage test circuit 323 Earth leakage test switch

Claims (5)

An open / close contact that opens and closes the electrical circuit;
An overcurrent trip device that trips the switching contact in a closed state when a current of a predetermined value or more flows in the electric circuit;
A trip device for confirming operation that is driven based on an external signal and opens the open / close contact in a closed state regardless of tripping by the overcurrent tripping device;
An operation display unit for displaying that the trip device for operation confirmation is driven;
Circuit breaker with An open / close contact that opens and closes the electrical circuit;
When a leakage current flows in the electric circuit, an electric leakage trip device for pulling off the open / close contact in a closed state;
A trip device for confirming operation that is driven based on an external signal and opens the open / close contact in a closed state regardless of tripping by the leakage trip device, and
An operation display unit for displaying that the trip device for operation confirmation is driven;
Circuit breaker with   The circuit breaker according to claim 1, wherein the operation display unit self-holds the display.   The circuit breaker according to any one of claims 1 to 3, wherein the operation display unit includes an operation indicator lamp that performs the display by lighting. The circuit breaker according to any one of claims 1 to 3, wherein the operation display unit is configured by mechanical operation display means for performing the display by mechanical display.