Testing device system of circuit breaker for earth fault currents or residual currents

Abstract

The invention relates to a testing device system of a circuit breaker for earth fault currents or residual currents. The testing device system comprises a testing circuit and a display device, wherein the testing circuit is used for checking actions of the circuit breaker when earth fault currents or residual currents occur, the display device is used for indicating off or on conditions of the circuit breaker, the two functional modules of the testing circuit and the display device of the testing device system are mutually independent and have no necessary association in part composition, moving state and electrical circuit, during operation of each functional module, and if one module has a failure and cannot operate normally, normal operation of other parts cannot be affected by the failure.

Description

technical field [0001] The present invention relates to a test device system for a low-voltage ground fault current or residual current circuit breaker. The test device system includes a test circuit and a display device. [0002] The test circuit is used to check the action of the circuit breaker when there is a ground fault current or residual current, and the display device is used to indicate the disconnected or connected state of the circuit breaker. Background technique [0003] As we all know, it is necessary to install circuit breakers for electric shock protection in low-voltage power distribution systems, especially circuit breakers for residual current protection. Circuit breakers usually have a test device for users to test circuit breakers regularly to ensure residual current protection. The protection function is normal. [0004] CN 1031737C discloses a test key device of an earth leakage current circuit breaker or a differential current circuit breaker, the t...

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Problems solved by technology

[0004] CN 1031737C discloses a test key device of an earth leakage current circuit breaker or a differential current circuit breaker, the test key device has a function of testing the leakage current circuit breaker action and an indicator, and it can be known from the information disclosed in CN 1031737C that CN The scheme disclosed in 1031737C can well solve the problem that when the circuit breaker disclosed in West German patent DE4.001,680 A1 is in the off position, the test circuit is still connected by pressing the test button and the test resistor is burned out, but in the scheme disclosed in CN 1031737C It is to mesh the test circuit with the elastic part of the indicator. If there is a failure of the elastic part or a manufacturing defect, the test circuit and the indicator will not work.

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