Circuit breaker

Abstract

To provide a circuit breaker capable of quickly extinguishing an arc in the event that an arc occurs. [Solution] The circuit breaker (100) comprises a fixed terminal (1), a movable contact (3), a moving mechanism, an igniter (51), and a housing chamber (70). The fixed terminal (1) has a fixed contact (11). The movable contact (3) has a movable contact (31) connected to the fixed contact (11). The moving mechanism moves the movable contact (3) from a closed position where the movable contact (31) is connected to the fixed contact (11) to an open position where the movable contact (31) is separated from the fixed contact (11). The igniter (51) generates gas by combustion. The housing chamber (70) houses the fixed contact (11) and the movable contact (3). In the circuit breaker (100), gas is introduced into the housing chamber (70).

Claims

1. A housing having a lower enclosure, A piston disposed within the housing, An igniter containing gunpowder, which moves the piston downward by the combustion of the gunpowder, A conductor positioned below the piston, having a first terminal portion, a second terminal portion, and a connecting portion that electrically connects the first terminal portion and the second terminal portion, A metal member located inside the lower housing and below the connection portion, Equipped with, When the ignition device is activated, the connection part moves downward, and the electrical connection between the first terminal and the second terminal is interrupted. The metal member is compressed when the connecting portion moves downward. Circuit breaker.

2. The aforementioned lower housing is A metal outer cylinder, It comprises an insulating inner cylinder arranged to cover the inner surface of the outer cylinder, The metal member is located between the inner cylinder and the connecting portion. The circuit breaker according to claim 1.

3. The aforementioned metal member has elasticity, After the movement of the connecting portion, the metal member applies an upward force to the connecting portion. The circuit breaker according to claim 1.

4. The housing further includes a lid member that is fixed to the upper part of the lower housing, The lid member includes an end portion located inside the lower housing. The circuit breaker according to claim 1.

5. The housing further includes a lid member that is fixed to the upper part of the lower housing, The piston and the connecting part are in contact. Before the movement of the connecting portion, the lower surface of the piston is located on the side of the lid member between the lid member and the lower housing. After the movement of the connecting portion, the lower surface of the piston is located on the lower housing side of the lid member and the lower housing. The circuit breaker according to claim 1.

6. The housing has a protrusion that extends upward from the bottom, The metal member is in contact with the protrusion. The circuit breaker according to claim 1.

7. The outer cylinder is made of a nonmagnetic material. The circuit breaker according to claim 2.

8. Housing and An igniter that generates gas is provided inside the housing, A projectile that moves downward due to the pressure of the gas generated by the igniter, An electrical circuit having a first terminal located outside the housing, a first intermediate portion electrically connected to the first terminal, a separation portion located inside the housing and electrically connected to the first intermediate portion, a second intermediate portion electrically connected to the separation portion, and a second terminal located outside the housing and electrically connected to the second intermediate portion, Equipped with, The aforementioned housing is A cylindrical outer body made of metal, with an opening at the top, A lid member, formed of a first resin material, covering the first intermediate portion and the second intermediate portion, and positioned above the outer cylinder such that at least a portion of it is located inside the outer cylinder, It has, The separation unit is moved downward by the projectile moving downward and housed inside the outer cylinder. Circuit breaker.

9. The lid member has a cylindrical portion that opens downward and is positioned inside the outer cylinder, The inner diameter of the cylindrical portion of the lid member is smaller than the inner diameter of the outer cylinder. The inner wall surface of the cylindrical portion of the lid member is located inside the housing, The circuit breaker according to claim 8.

10. The housing is formed of a second resin material and further includes an inner cylinder that opens upward and is disposed within the outer cylinder. The separation unit is moved downward by the projectile moving downward and housed inside the inner cylinder. The inner diameter of the cylindrical portion of the lid member is smaller than the inner diameter of the inner cylinder. The inner wall surface of the cylindrical portion of the lid member is located inside the housing, The circuit breaker according to claim 9.

11. The lower end of the cylindrical portion of the lid member is located below the upper end of the inner cylinder. The circuit breaker according to claim 10.

12. The first intermediate section is located to the left of the second intermediate section. In the state where the separation part is moved downward, The first intermediate portion includes a first covering portion that is covered by the lid member, and a first exposed portion whose right end faces the projectile and is exposed from the lid member. The second intermediate portion includes a second covering portion that is covered by the lid member, and a second exposed portion whose left end faces the projectile and is exposed from the lid member. The right end face of the first exposed portion and the left end face of the second exposed portion face each other across the projectile, The circuit breaker according to claim 11.

13. The aforementioned housing is A first space in which the right end face of the first exposed portion and the left end face of the second exposed portion are arranged, A second space in which the separated part that has moved downward is located, It has, The inner diameter of the housing in the first space is smaller than the inner diameter of the housing in the second space. The inner wall surface of the housing in the first space is located further inside the housing than the inner wall surface of the housing in the second space. The circuit breaker according to claim 12.

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