JPH0210737U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the earth leakage breaker of this invention, Figs. 2A and 2B are waveform diagrams showing the operation of this embodiment, and Fig. 3 is a circuit diagram of the earth leakage breaker according to the prior art. The circuit diagrams, FIG. 4A, FIG. 4B, and FIG. 4C are waveform diagrams showing the operation of a conventional earth leakage breaker. In the figure, A and B are electric circuits, 3A and 3B are interrupting means,
5 is a current transformer, 9 is a detection means, 15 is a switch means, 16A is a full-wave rectifier circuit, 16B is an output terminal, 1
6D is a conductor.

Claims (1)

[Scope of Claim for Utility Model Registration] A zero-phase current transformer that is installed in an electrical circuit and detects the current in the electrical circuit, a breaking means that interrupts the electrical circuit when the detection output of the zero-phase current transformer exceeds a predetermined value, and at least one electrical circuit. a detection means for detecting abnormal current in the electric circuit, a switch means that operates when the detection output of the detection means continuously exceeds a predetermined value for a predetermined period of time, a full-wave rectifier circuit for full-wave rectification of the alternating current voltage in the electric circuit;
and an earth leakage breaker having one conductor per wire that connects the output terminal of the full-wave rectifier circuit and the switching means while passing through the zero-phase current transformer.