Earth leakage breaker

Abstract

An earth leakage breaker includes a main contact, a switch mechanism, an operating handle, a leakage tripping device and an over-current tripping device having an earth-leakage-detection circuit disposed in a main-body case. A power-supply line connects the earth-leakage-detection circuit to the main circuit for supplying voltage between phases of the main circuit as a power source of the earth-leakage-detection circuit. Further, a test switch is provided for turning on and off a power-supply circuit of the power-supply line connected to the earth-leakage-detection circuit, and an operation of the test switch is linked to an ON / OFF operation of the switch mechanism.

Description

technical field [0001] The present invention relates to a leakage circuit breaker with overcurrent protection and grounding protection functions suitable for low-voltage power distribution systems, and more specifically, to a method for cutting off the leakage detection circuit from the main circuit when carrying out the withstand voltage test of the leakage circuit breaker protective device. Background technique [0002] As protectors for low-voltage power distribution systems, there are known circuit breakers for wiring and earth leakage circuit breakers. The earth leakage circuit breakers popular in China are generally earth leakage circuit breakers with overcurrent protection function and grounding protection function. In addition, for recent earth leakage circuit breakers, in order to improve the usability of the target party, earth leakage circuit breakers with the following structure have become mainstream: In the wiring circuit breaker of the same structure, the eart...

AI Technical Summary

Problems solved by technology

[0013] However, the earth leakage circuit breaker of the above-mentioned single-body structure has the same external dimensions as the circuit breaker for wiring, and inside the main body case, such as Figure 9 As shown, functional parts for overcurrent protection and leakage protection are filled with almost no space left, and there is no room for adding a new switch for withstand voltage test.

Therefore, in order to secure a new space for the switch for the withstand voltage test to be built in the main body case, it is necessary to change the structural parts and their layout in design, especially the common parts and layout of the circuit breaker for wiring and the earth leakage circuit breaker. In the case of design changes, there is a problem that a large development cost and time are required

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