Leakage circuit breaker

Abstract

To safely test a ground fault breaker by separating a ground fault detecting circuit from a main circuit with a simple operation when performing a voltage-withstanding test for the breaker having a main body case with a wiring breaker, components of a ground fault detecting / separating device mounted therein. The breaker with overcurrent and ground protection functions mounts a ground fault separating device including a main contact 2, an opening / closing mechanism 3, an operation handle, an overcurrent separating device 5 and a ground fault detecting circuit 7 for opening / closing a main circuit 1, and applies an interphase voltage of the main circuit 1 to the detecting circuit via a power supply line 9 wired between the detecting circuit. The breaker has a switch 21 for the voltage-withstanding test for switching on or off the circuit of the power supply line 9 connected to the detecting circuit in conjunction with opening / closing operations of the main contact, and, as the switch 21, an auxiliary switch of an attachment, for example, is used to separate the detecting circuit from the main circuit in conjunction with the opening pole operation of the main contact when performing the voltage-withstanding test.

Description

technical field [0001] The present invention relates to an earth leakage circuit breaker with overcurrent protection and grounding protection functions suitable for low-voltage power distribution systems. Disconnected protective device. Background technique [0002] Circuit breakers and earth leakage circuit breakers are known as protectors for low-voltage power distribution systems, and earth leakage circuit breakers, which are generally popular in China, have an overcurrent protection function and a grounding protection function. In addition, among the recent earth leakage circuit breakers, in order to improve the usability of the demanded object, the type that is constituted by the following method has become the mainstream. A main body case, and share the main components as much as possible (for example, refer to Patent Document 1). [0003] In addition, in order to also flexibly respond to various protection systems of power distribution equipment, the following types...

AI Technical Summary

Problems solved by technology

Therefore, there is a danger that, after the withstand voltage test, the switch for the withstand voltage test is forgotten to return to the ON state, and the main contact is turned on through the operating handle of the circuit breaker for wiring, so that the switch for wiring is turned on. Circuit breaker returns to service

In addition, if you forget to turn on the switch for the withstand voltage test after the withstand voltage test is completed, the leakage detection circuit is still disconnected from the main circuit. The situation that the leakage protection function does not work

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