Circuit breaker

Abstract

The present invention relates to a circuit breaker. The circuit breaker is composed of a right and left parallel configured first and second fixed contact, rotary type bridging type movable contacts providing movable connection points on a U-shaped arm, and gate arc-control devices respectively corresponding configured with the first and second fixed contacts. In a two-point disconnecting mode circuit-breaking switch loading these components in a unit assembling frame body, a U-shaped magnet yoke surrounding a connection point section of fixed contacts from right and left, and the side edge section of the U-shaped magnet yoke can stand along the broken circuit moving path of the movable contacts; an insulating barrier and a yoke cover made from insulation materials are provided in the unit assembling frame body, the insulating barrier is inserted between fixed contacts and extends along the broken circuit moving path of the movable contacts; the yoke covers are provided on the right and left sides of the insulating barrier, covers the right and left side edge sections of the magnet yoke from inner side, and are insulated from the fixed contacts; and an electric arc converter boardis provided on the upper segment of the arc-control device spanning the right and left arc-extinguishing chambers.

Description

technical field [0001] The present invention relates to a circuit breaker suitable for wiring of low-voltage power distribution lines. Two pairs of switching contacts are combined in series at the current breaking part of each pole to make the circuit breaker of the two-point breaking method for overcurrent breaking. Specifically, it relates to the cell structure of its current interrupting unit. Background technique [0002] A circuit breaker of a two-point breaking system is known in which two pairs of switching contacts are connected in series to a current breaking part of each pole to break an overcurrent (for example, refer to Patent Document 1). [0003] The current breaking unit of the two-point breaking circuit breaker is composed of first and second fixed contacts, a rotary bridging type movable contact, and an arc extinguishing device. The above-mentioned first and second fixed contacts are arranged left and right, and fixed contacts are fixed at their front ends;...

AI Technical Summary

Problems solved by technology

Therefore, when the arc voltage of the arc elongated between the fixed / movable contacts becomes more than the dielectric strength between the fixed contacts 1 and 2 arranged left and right, the insulation between the fixed contacts is broken, causing the first fixed contact The contacts of the head 1 and the second fixed contact 2 are directly connected by an arc, and as a result, there is a problem that the breaking performance of the two-point breaking circuit breaker cannot be exhibited.

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