JP2010257953A - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely break electric connection between poles of a DC power supply or an AC power supply all through an overcurrent range. <P>SOLUTION: This invention is applicable to a circuit breaker arranged in a power supply circuit that supplies power from a power supply 10 to a load 20. The circuit breaker includes: a circuit breaker 40 having main contacts 40A and 40B separately interposed between the two poles of the power supply 10 and the load 20; a fuse 30 that is interposed between one of the poles of the power supply 10 and the load 20 to be serial to the main contact 40B; and a voltage trip coil 50 to which a voltage is applied in response to fusion of the fuse 30. The circuit breaker 40 is activated by the voltage trip coil 50 to which a voltage is applied, and disconnects the main contacts 40A and 40B to break the connection between the two poles of the power supply 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a circuit breaker that interrupts both poles of a power supply when an overcurrent accident or a short-circuit accident occurs in a load in a power supply circuit that supplies power to a load from a DC power supply or an AC power supply.

  A DC power supply circuit that supplies power to a load from a DC power supply is provided with a circuit breaker that shuts off both positive and negative poles of the DC power supply when an overcurrent accident or a short circuit accident occurs in the load.

  As an example of the circuit breaker, as shown in FIG. 14, fuses 300A and 300B are respectively inserted between the positive and negative poles of the DC power supply 10 and the load 20, and the fuses 300A and 300B are blown by overcurrent, so that the DC There is a circuit breaker that cuts off both the positive and negative poles of the power supply 10.

  As another example of the circuit breaker, as shown in FIG. 15, main contacts 400A and 400B of a circuit breaker 400 are respectively inserted between the positive and negative poles of the DC power supply 10 and the load 20, and the main contact 400A is caused by overcurrent. , 400B, and a circuit breaker that cuts off both the positive and negative poles of the DC power supply 10.

  As another example of the circuit breaker, as shown in FIG. 16, a circuit breaker 400, which is a combination of the above two examples, that is, a circuit breaker 400 between the positive and negative poles of the DC power supply 10 and the load 20, respectively. There are circuit breakers in which main contacts 400A and 400B are inserted and fuses 300A and 300B are inserted in series with main contacts 400A and 400B, respectively.

Japanese Patent No. 3091712 Japanese Patent No. 2513350 Japanese Patent No. 2998934

  However, the circuit breakers shown in FIGS. 14 to 16 have the following problems, respectively.

  In the circuit breaker using the fuses 300A and 300B shown in FIG. 14, two fuses 300A and 300B are connected in series in the same closed circuit. For this reason, when an overcurrent accident or a short-circuit accident occurs in the load 20, the same current flows through both fuses 300A and 300B, so theoretically both fuses 300A and 300B are fused at the same time.

  However, in reality, there are individual differences in the characteristics of the fuses 300A and 300B, and therefore only one of the fuses 300A and 300B may be blown. In this case, the pole where the fuse of the DC power supply 10 is blown is disconnected from the load 20, but the pole which is not blown remains connected to the load 20. For this reason, if there is a potential difference between the unfused pole and the ground, there is a problem that there is a risk of electric shock when the human body touches the charging unit.

  In the circuit breaker using the circuit breaker 400 shown in FIG. 15, the positive and negative poles of the DC power supply 10 are cut off in conjunction with each other, so that the positive and negative poles of the DC power supply 10 are cut off collectively when an overcurrent accident occurs in the load 20. It is possible.

  However, even if the circuit breaker 400 is within the breaking capacity range, if the large current that causes the main contacts 400A and 400B to be damaged by the arc is interrupted, the use of the circuit breaker 400 cannot be guaranteed. There are challenges.

  In the circuit breaker using the fuses 300A and 300B and the circuit breaker 400 shown in FIG. 16, the protection coordination between the circuit breaker 400 and the fuses 300A and 300B, that is, the breaking characteristics of the circuit breaker 400 and the fuses 300A and 300B. According to the combination with the fusing characteristics, the circuit breaker 400 and the fuses 300A and 300B having the shorter interruption time perform the interruption operation.

  FIG. 17 is a diagram showing the relationship between the current and the breaking time in the circuit breaker shown in FIG.

  As shown in FIG. 17, in the overcurrent region exceeding the rated current, the circuit breaker 400 performs a breaking operation because the breaking time of the circuit breaker 400 is set shorter than the fuses 300A and 300B in a small current range. . Further, in the large current range, the fuses 300A and 300B perform the breaking operation because the breaking time of the fuses 300A and 300B is set shorter than that of the circuit breaker 400.

  At this time, if the intersection between the breaking characteristics of the circuit breaker 400 and the fusing characteristics of the fuses 300A and 300B is set to be equal to or less than a specified current value at which the repeated use of the circuit breaker 400 is guaranteed, the current at which the repeated use of the circuit breaker 400 is not guaranteed. The fuses 300A and 300B are responsible for interrupting the range.

  In other words, since the fuses 300A and 300B cut off the current exceeding the specified current value that guarantees repeated use of the circuit breaker 400, the circuit breaker 400 is not damaged.

  Further, in the current region where the circuit breaker 400 performs the shut-off operation, the circuit breaker 400 shuts off both the positive and negative poles of the DC power supply 10, so that the positive and negative poles of the DC power supply 10 can be cut off reliably.

  On the other hand, since the specified current value that guarantees repeated use of the circuit breaker 400 can be reduced by widening the current range that the fuses 300A and 300B cut off, the size of the circuit breaker can also be reduced.

  However, in the current region where the fuses 300A and 300B perform the breaking operation, even if an overcurrent occurs, the circuit breaker 400 does not perform the breaking operation and remains in the closed state. Due to the difference problem, there still remains a problem that the positive and negative poles of the DC power supply 10 are not reliably shut off.

  In view of the above, an object of the present invention is to provide a circuit breaker that solves the above-described problems and can reliably cut off both positive and negative poles of a DC power supply in all overcurrent regions.

The circuit breaker of the present invention is
A circuit breaker disposed in a power supply circuit that supplies power to a load from a DC or AC power source,
A fuse interposed between one pole of the power source and the load;
A circuit breaker that cuts off at least the other pole of the power supply in which the fuse is not inserted is interlocked with the melting of the fuse.

  In the present invention, when an overcurrent accident or a short-circuit accident occurs in the load, a fuse inserted between one pole of the power source and the load is blown, and in conjunction with the blow of the fuse, the circuit breaker is connected to the power source. At least the other pole where no fuse is inserted is cut off.

  Therefore, in the present invention, when an overcurrent accident or a short-circuit accident occurs in the load, both the positive and negative poles of the power supply can be collectively shut off in all overcurrent areas within the range of the breaking capacity of the fuse. An effect is obtained.

  Further, in the present invention, the number of main contacts of the fuse and circuit breaker is reduced compared to the conventional configuration (FIG. 16) in which the main contact of the circuit breaker is inserted between the positive and negative poles of the DC power supply and the fuse is also inserted. Therefore, the installation space and the manufacturing cost can be reduced.

  Further, in the present invention, even when using a circuit breaker in which the interruption time is longer than the fusing time of the fuse in all overcurrent regions, or when using a circuit breaker that does not perform an interruption operation depending on overcurrent, Since the fuse is blown by an overcurrent and the circuit breaker trips, the effect that both poles of the power supply can be cut off is obtained.

It is a figure which shows the structure of the circuit breaker of the 1st Embodiment of this invention. It is a figure which shows the relationship between the electric current and interruption | blocking time in the circuit breaker of the 2nd Embodiment of this invention. It is a figure which shows the structure of the circuit breaker of Example 1 of this invention. It is a figure which shows the structure of the circuit breaker of Example 2 of this invention. It is a figure which shows the structure of the circuit breaker of Example 3 of this invention. It is a figure which shows the state at the time of the incomplete short circuit accident occurrence in the circuit breaker of Example 2 of this invention. It is a figure which shows the state at the time of the incomplete short circuit accident occurrence in the circuit breaker of Example 3 of this invention. It is a figure which shows the structure of the circuit breaker of Example 4 of this invention. It is a figure which shows the structure of the circuit breaker of the 2nd Embodiment of this invention. It is a figure which shows the structure of the circuit breaker of Example 5 of this invention. It is a figure which shows the structure of the circuit breaker of Example 6 of this invention. It is a figure which shows the structure of the circuit breaker of Example 7 of this invention. It is a figure which shows the structure of the circuit breaker of Example 8 of this invention. It is a figure which shows one structural example of the conventional circuit breaker. It is a figure which shows the other structural example of the conventional circuit breaker. It is a figure which shows the further another structural example of the conventional circuit breaker. It is a figure which shows the relationship between the electric current in the circuit breaker shown in FIG. 16, and interruption | blocking time.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated with reference to drawings.
[First Embodiment]
FIG. 1 is a diagram illustrating a configuration of a circuit breaker according to a first embodiment of the present invention.

  Referring to FIG. 1, the circuit breaker according to the present embodiment is arranged in a DC power supply circuit that supplies power to a load 20 from a DC power supply 10. Between the circuit breaker 40 in which the contacts 40A and 40B are inserted, the positive electrode of the DC power supply 10 and the load 20, the fuse 30 inserted in series with the main contact 40B, and the voltage in conjunction with the fusing of the fuse 30 And a voltage trip coil 50 that activates the circuit breaker 40.

  In FIG. 1, the circuit breaker 40 and the voltage trip coil 50 are integrated as an MCCB (Molded Case Circuit Breaker).

  In FIG. 1, the connection position of the fuse 30 is the positive side of the DC power supply 10 and the load side of the circuit breaker 40. However, the present invention is not limited to this, and the connection position of the fuse 30 is not limited to the DC power supply 10. Either the positive electrode side or the negative electrode side may be used, and either the power source side or the load side of the circuit breaker 40 may be used.

In the circuit breaker of the present embodiment, when an overcurrent accident or a short circuit accident occurs in the load 20 and the fuse 30 is blown, a voltage is applied to the voltage trip coil 50 by any of the following three methods, thereby The circuit breaker 40 disconnects the main contacts 40 </ b> A and 40 </ b> B in conjunction with each other to cut off (trip) the positive and negative poles of the DC power supply 10.
(1) First power supply system cooperation method (2) Second power supply system cooperation method (3) Control system cooperation method Thereby, even in the current region where the fuse shown in FIG. Since both the positive and negative poles of the DC power supply 10 are cut off, the positive and negative poles of the DC power supply 10 can be reliably cut off in all overcurrent regions.

  In the present embodiment, as the circuit breaker 40, as shown in FIG. 2, a circuit breaker having a cut-off time longer than the fusing time of the fuse 30 in all overcurrent regions is used, or the circuit breaker 40 is automatically activated by overcurrent. Even when a circuit breaker that does not trip is used, the fuse 30 is blown by an overcurrent and the circuit breaker 40 trips, so that both the positive and negative poles of the DC power supply 10 can be cut off.

  Hereinafter, specific examples of the circuit breaker according to the present embodiment will be described.

  FIG. 3 is a diagram illustrating a configuration of the circuit breaker according to the first embodiment of the present invention.

  The present embodiment is an example of the circuit breaker according to the first embodiment when the above-described (1) first power feeding system cooperation method is applied as a voltage application method to the voltage trip coil 50.

  Referring to FIG. 3, in the circuit breaker of this embodiment, the voltage trip coil 50 is connected in parallel to both ends of the fuse 30.

  The resistance of the fuse 30 is on the order of milliohms, and almost no voltage is applied to the voltage trip coil 50 in a normal state, so the circuit breaker 40 does not trip.

  However, when an overcurrent accident or a short-circuit accident occurs in the load 20 and the fuse 30 is blown, a voltage is generated due to a potential difference between both ends of the fuse 30, and the voltage is applied to the voltage trip coil 50. Tripping occurs, and both the positive and negative poles of the DC power supply 10 are cut off.

  FIG. 4 is a diagram illustrating the configuration of the circuit breaker according to the second embodiment of the present invention.

  This example is an example of the circuit breaker according to the first embodiment when the above-described (2) second power feeding system cooperation method is applied as a voltage application method to the voltage trip coil 50.

  Referring to FIG. 4, the circuit breaker of this embodiment includes an A contact switch 60 interposed between the fuse 30 and the voltage trip coil 50, as compared with the circuit breaker of Embodiment 1 of FIG. 3. In addition, a switch driving unit 70 that detects the fusing of the fuse 30 and closes the A contact switch 60 is added.

  Here, as a method of realizing the switch drive unit 70, the switch 30 is moved by a method of combining a sensor that electrically detects the blowout of the fuse 30 and an electromagnetic relay, or by a blowout of an alarm fuse and an alarm fuse provided in the fuse 30. Although there is a method of combining with a spring, etc., the present invention is not limited to this, and any method may be used as long as the A contact can be driven (closed state).

  In this embodiment, the voltage trip coil 50 is inserted into the power supply system as in the first embodiment. However, before the fuse 30 is blown, the A contact switch 60 is in an open state. Not applied.

  However, when an overcurrent accident or a short circuit accident occurs in the load 20 and the fuse 30 is blown, the A contact switch 60 is closed via the switch drive unit 70 after the fuse 30 is blown, and voltage is applied to the voltage trip coil 50. Then, the circuit breaker 40 trips and both the positive and negative poles of the DC power supply 10 are cut off.

  In the first embodiment, the circuit configuration is simpler than that of the present embodiment, but since a closed loop via the fuse 30 is formed at both ends of the voltage trip coil 50, electromagnetic induction such as noise from the power supply system is formed. There is a risk that a voltage is generated in the voltage trip coil 50 and the circuit breaker 40 malfunctions. However, according to the present embodiment, this problem can be prevented.

  FIG. 5 is a diagram illustrating the configuration of the circuit breaker according to the third embodiment of the present invention.

  This example is an example of the circuit breaker according to the first embodiment when the above-described (2) second power feeding system cooperation method is applied as a voltage application method to the voltage trip coil 50.

  Referring to FIG. 5, the circuit breaker of the present embodiment is different from the circuit breaker of the second embodiment of FIG. 4 only in the connection destination at one end of the voltage trip coil 50, and the other configurations are the same. .

  That is, if the voltage trip coil 50 and the A contact switch 60 connected in series are defined as subcircuits, in the second embodiment, the subcircuit is connected to both ends of the fuse 30. One end of the sub circuit is connected to the electric circuit on the DC power supply 10 side of the fuse 30 and the other end is connected to the electric circuit on the pole side where the fuse 30 of the DC power supply 10 is not inserted.

  Here, a case where an incomplete short circuit accident occurs in the load 20 and the fuse 30 is blown is considered. An incomplete short circuit accident is an accident in which a certain resistance value remains in the load 20 even after the accident.

  In the second embodiment, as shown in FIG. 6, when an incomplete short circuit accident occurs in the load 20 (state 1) and the A contact switch 60 is closed due to the fuse 30 being blown (state 2), the DC power supply The voltage of 10 is divided into a voltage trip coil 50 and an incompletely shorted load 20. Then, although depending on the specification of MCCB, a sufficient voltage may not be applied to the voltage trip coil 50, and the circuit breaker 40 may not trip.

  On the other hand, in this embodiment, as shown in FIG. 7, even when an incomplete short circuit accident occurs in the load 20 (state 1) and the A contact switch 60 is closed due to melting of the fuse 30 ( In the state 2), the voltage division as in the second embodiment does not occur, and the voltage of the DC power supply 10 is applied to the voltage trip coil 50 regardless of the state of the load 20. Therefore, it is possible to prevent a cutoff error in MCCB.

  FIG. 8 is a diagram illustrating the configuration of the circuit breaker according to the fourth embodiment of the present invention.

  The present embodiment is an example of the circuit breaker according to the first embodiment when the above-described (3) control system cooperation method is applied as a voltage application method to the voltage trip coil 50.

  Referring to FIG. 8, the circuit breaker of the present embodiment is compared with the circuit breaker of the second embodiment of FIG. 4 by adding an external power supply 80 for applying a voltage to the voltage trip coil 50, and voltage trip. The coil 50, the A contact switch 60, and the external power supply 80 are connected in series to form a closed loop.

  In this embodiment, when the A contact switch 60 is closed via the switch drive unit 70, a voltage is applied from the external power source 80 to the voltage trip coil 50, the circuit breaker 40 trips, and both the positive and negative poles of the DC power source 10 are switched. Blocked.

In the first and second embodiments, the circuit configuration is simpler than that of the present embodiment, but the voltage applied to the voltage trip coil 50 after the fuse 30 is blown is affected by the impedance of the load 20 and the circuit breaker 40 itself. When the circuit breaker is not designed in consideration of these impedances, a voltage for operating the voltage trip coil 50 cannot be obtained, or a voltage higher than the standard voltage value is applied to the voltage trip coil 50 There can be. However, according to the present embodiment, this problem can be solved.
[Second Embodiment]
FIG. 9 is a diagram showing the configuration of the circuit breaker according to the second embodiment of the present invention.

  Referring to FIG. 9, the circuit breaker according to the present embodiment is different from the circuit breaker according to the first embodiment of FIG. The difference is that only the main contact 40 </ b> A inserted between the pole 20 where no fuse 30 is inserted and the load 20 is disconnected.

  However, as the circuit breaker 40, as shown in FIG. 2, a circuit breaker having a cut-off time longer than the fusing time of the fuse 30 in all overcurrent regions is used, or a circuit that does not automatically trip due to overcurrent. It is a requirement to use a breaker. This is because if the circuit breaker 40 performs the breaking operation before the fuse 30, the pole inserted through the fuse 30 is not cut off.

  If this requirement is satisfied, the positive and negative poles of the DC power supply 10 can be cut off only by inserting the main contact of the circuit breaker 40 into one pole. Therefore, the main contact of the circuit breaker 40 is inserted into the positive and negative poles of the DC power supply 10. Compared with the configuration of the first embodiment, the installation space and the manufacturing cost can be reduced.

  Hereinafter, specific examples of the circuit breaker according to the present embodiment will be described.

  FIG. 10 is a diagram illustrating the configuration of the circuit breaker according to the fifth embodiment of the present invention.

  This example is an example of the circuit breaker according to the second embodiment when the above-described (1) first feeding system linkage method is applied as a voltage application method to the voltage trip coil 50.

  Compared with the circuit breaker of the first embodiment of FIG. 3, the circuit breaker of the present embodiment has the main contact 40A of the circuit breaker 40 inserted only in one pole of the DC power supply 10, and only the main contact 40A is disconnected. Since other configurations and operations are the same, description thereof will be omitted.

  FIG. 11 is a diagram illustrating the configuration of the circuit breaker according to the sixth embodiment of the present invention.

  The present embodiment is an example of the circuit breaker according to the second embodiment in the case where the above-described (2) second power feeding system cooperation method is applied as a voltage application method to the voltage trip coil 50.

  Compared with the circuit breaker of the second embodiment of FIG. 4, the circuit breaker of the present embodiment inserts the main contact 40 </ b> A of the circuit breaker 40 only in one pole of the DC power supply 10 and disconnects only the main contact 40 </ b> A. Since other configurations and operations are the same, description thereof will be omitted.

  FIG. 12 is a diagram illustrating the configuration of the circuit breaker according to the seventh embodiment of the present invention.

  The present embodiment is an example of the circuit breaker according to the second embodiment in the case where the above-described (2) second power feeding system cooperation method is applied as a voltage application method to the voltage trip coil 50.

  Compared with the circuit breaker of the third embodiment of FIG. 5, the circuit breaker of the present embodiment inserts the main contact 40 </ b> A of the circuit breaker 40 only in one pole of the DC power supply 10 and disconnects only the main contact 40 </ b> A. Since other configurations and operations are the same, description thereof will be omitted.

  FIG. 13 is a diagram illustrating a configuration of a circuit breaker according to an eighth embodiment of the present invention.

  The present embodiment is an example of the circuit breaker according to the second embodiment when the above-described (3) control system cooperation method is applied as a voltage application method to the voltage trip coil 50.

  Compared with the circuit breaker of the fourth embodiment of FIG. 8, the circuit breaker of the present embodiment inserts the main contact 40 </ b> A of the circuit breaker 40 only at one pole of the DC power supply 10 and disconnects only the main contact 40 </ b> A. Since other configurations and operations are the same, description thereof will be omitted.

  In the present embodiment, the circuit breaker of the present invention is applied to a DC power supply circuit that supplies power to a load from a DC power supply. However, the present invention is not limited to this, and power is supplied from the AC power supply to the load. The present invention can be similarly applied to the AC power feeding circuit.

10 DC power supply 20 Load 30 Fuse 40 Circuit breaker 40A, 40B Main contact 50 Voltage trip coil 60 A contact switch 70 Switch drive unit 80 External power supply

Claims (11)

A circuit breaker disposed in a power supply circuit that supplies power to a load from a DC or AC power source,
A fuse interposed between one pole of the power source and the load;
A circuit breaker comprising: a circuit breaker that interrupts at least the other pole of the power source in which the fuse is not inserted in conjunction with the melting of the fuse.   2. The circuit breaker according to claim 1, wherein the circuit breaker cuts off both poles of the power source in conjunction with melting of the fuse.   The circuit breaker according to claim 1, wherein the circuit breaker interrupts the other pole of the power source in conjunction with the melting of the fuse. A trip coil connected in parallel with the fuse, to which a voltage is applied by a potential difference across the fuse;
The circuit breaker according to claim 1 or 2, wherein the circuit breaker is operated by the trip coil to which a voltage is applied, and interrupts both poles of the power source. A trip coil having one end connected to one end of the fuse;
A switch interposed between the other end of the fuse and the other end of the trip coil;
A switch driving means for closing the switch in conjunction with melting of the fuse, and further comprising:
When the trip coil is closed, the trip coil is applied with a voltage due to a potential difference between both ends of the fuse,
The circuit breaker according to claim 1 or 2, wherein the circuit breaker is operated by the trip coil to which a voltage is applied, and interrupts both poles of the power source. A trip coil and a switch are connected in series, and one end is connected to the electric circuit on the power source side of the fuse, and the other end is connected to the electric circuit on the other pole side where the fuse of the power source is not inserted. A sub-circuit;
A switch driving means for closing the switch in conjunction with melting of the fuse, and further comprising:
When the trip coil is closed, the trip coil is applied with a voltage due to a potential difference between both ends of the fuse,
The circuit breaker according to claim 1 or 2, wherein the circuit breaker is operated by the trip coil to which a voltage is applied, and interrupts both poles of the power source. A closed loop comprising a trip coil, a switch and an external power supply connected in series;
A switch driving means for closing the switch in conjunction with melting of the fuse, and further comprising:
When the switch is in a closed state, the trip coil is applied with a voltage by the external power source,
The circuit breaker according to claim 1 or 2, wherein the circuit breaker is operated by the trip coil to which a voltage is applied, and interrupts both poles of the power source. A trip coil connected in parallel with the fuse, to which a voltage is applied by a potential difference across the fuse;
The circuit breaker has a shut-off characteristic with a shut-off time longer than the fusing time of the fuse or a shut-off characteristic that does not perform a shut-off operation due to overcurrent, and is operated by the trip coil to which a voltage is applied, The circuit breaker according to claim 1 or 3, wherein the other pole is cut off. A trip coil having one end connected to one end of the fuse;
A switch interposed between the other end of the fuse and the other end of the trip coil;
A switch driving means for closing the switch in conjunction with melting of the fuse, and further comprising:
When the switch is closed, the trip coil is applied with a voltage due to a potential difference between both ends of the fuse,
The circuit breaker has a shut-off characteristic with a shut-off time longer than the fusing time of the fuse or a shut-off characteristic that does not perform a shut-off operation due to overcurrent, and is operated by the trip coil to which a voltage is applied, The circuit breaker according to claim 1 or 3, wherein the other pole is cut off. A trip coil and a switch are connected in series, and one end is connected to the electric circuit on the power source side of the fuse, and the other end is connected to the electric circuit on the other pole side where the fuse of the power source is not inserted. A sub-circuit;
A switch driving means for closing the switch in conjunction with melting of the fuse, and further comprising:
When the trip coil is closed, the trip coil is applied with a voltage due to a potential difference between both ends of the fuse,
The circuit breaker has a shut-off characteristic with a shut-off time longer than the fusing time of the fuse or a shut-off characteristic that does not perform a shut-off operation due to overcurrent, and is operated by the trip coil to which a voltage is applied, The circuit breaker according to claim 1 or 3, wherein the other pole is cut off. A closed loop comprising a trip coil, a switch and an external power supply connected in series;
A switch driving means for closing the switch in conjunction with melting of the fuse, and further comprising:
When the switch is in a closed state, the trip coil is applied with a voltage by the external power source,
The circuit breaker has a shut-off characteristic with a shut-off time longer than the fusing time of the fuse or a shut-off characteristic that does not perform a shut-off operation due to overcurrent, and is operated by the trip coil to which a voltage is applied, The circuit breaker according to claim 1 or 3, wherein the other pole is cut off.

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