Circuit breaker

Abstract

A circuit breaker is provided to improve reliability of the circuit breaker by enabling a user to perform a detachment work of an internal attached equipment. A circuit breaker includes a case, a cover(1b), a recess unit(1d), an internal attached equipment(9), an operating handle(6), interference lever(6b), and an interference projection(9a). A closing / opening instrument is received on a main body case having the case and the cover(1b). The recess unit(1d) which receives the internal attached equipment(9) is formed on a side part of the operation handle(6). The circuit breaker stops the internal attached equipment(9) from being installed in an on / off state of the circuit breaker. The circuit breaker allows an attachment / detachment of the internal attached equipment(9) in the state of a trip operation. The interference lever(6b) which moves to on / off / trip position is protruded on the recess unit(1d) through a coupling with the operation handle. The interference projection(9a) is installed on an outer case of the internal attached equipment(9).

Description

technical field [0001] The present invention relates to a circuit breaker aimed at a wiring circuit breaker, an earth leakage circuit breaker, and the like. Specifically, it relates to a storage structure for an internal accessory device formed on a cover of a main body case. Background technique [0002] Among the above wiring circuit breakers and earth leakage circuit breakers, as an accessory device selectively used by the user, as an after-installation selector, a device for electrically indicating the ON, OFF, and TRIP operations of the circuit breaker is prepared. Auxiliary switch, alarm switch, external signal, voltage trip device for tripping circuit breaker, undervoltage trip device, etc. Correspondingly, the cover of the main body case of the circuit breaker has accommodating parts (recessed parts) of the auxiliary covers for mounting the above-mentioned various internal accessories (for example, refer to Patent Document 1 and Patent Document 2). [0003] Taking t...

AI Technical Summary

Problems solved by technology

[0005] On the other hand, when the above-mentioned internal attachment is subsequently installed on the circuit breaker, when the circuit breaker is in the ON state (energized state), the internal attachment 9 is installed on the recessed portion 1d of the cover 1b, and there is a risk of making a mistake. It is dangerous to make your finger touch the charging part and get an electric shock

In addition, even when the circuit breaker is in the OFF state, during the work of attaching and detaching the internal accessory device 9, the plug of the switch mechanism (the switch spring is in a state of accumulating energy) is disengaged, causing unpredictable tripping operation

At this time, due to the shock accompanying the reverse operation of the switch mechanism, the actuator of the internal attachment device may be damaged, or the operator's fingers may be caught in the toggle mechanism and may be injured.

In particular, the undervoltage trip device cannot keep the circuit breaker in the reset state when there is no voltage, so even if the circuit breaker is in the OFF state, since the undervoltage trip device is installed, the switching mechanism performs a trip operation, so it is dangerous

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