Overload relay with adjustable threshold indicator

Details Overload relay with adjustable threshold indicator Overload relay with adjustable threshold indicator

1988-10-07

1989-11-07

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 340662, H02H 3093

Patent

active

048796263

ABSTRACT:
The present invention relates to an electronic overload relay which uses a schmidt trigger circuit or a CMOS integrated circuit, wherein the electronic overload relay includes an automatic return circuit connected in parallel between the output terminal of a NOT-gate and the input terminal of a succeeding NOT-gate, an instaneous operation characteristic circuit connected in series between one terminal of a variable resistance and the input terminal of the succeeding NOT-gate, and a temperature compensation circuit connected in parallel to the secondary coil of the current transformer.

REFERENCES:
patent: 4034269 (1977-07-01), Wilkinson
patent: 4075674 (1978-02-01), Squiers et al.
patent: 4277811 (1981-07-01), Sato
patent: 4345292 (1982-08-01), Jaeschke et al.
patent: 4414601 (1983-11-01), Conroy, Jr.

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