Electromagnetic contactor deposition detecting apparatus which d

Details Electromagnetic contactor deposition detecting apparatus which d Electromagnetic contactor deposition detecting apparatus which d

1991-10-11

1993-09-07

Snow, Walter E.

Electricity: measuring and testing

Electromechanical switching device

Relay

324537, 340644, 361 93, 361 31, H02H 300, G01R 3302, G01R 3132

Patent

active

052432912

ABSTRACT:
A circuit is provided for detecting the deposition of an electromagnetic contactor which opens and closes a drive circuit connecting a power source to a load. A load current of the drive circuit and an operating current for operating the electromagnetic contactor are detected and applied to a detection circuit. The thus detected load current and operating current are used to determine the deposition of the electromagnetic contactor. Further, in the event of a detected malfunction in the electromagnetic contactors, a breaker of the drive circuit is automatically opened.

REFERENCES:
patent: 4689570 (1987-08-01), Ohgaki et al.

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