DC Solid state overload relay

Details DC Solid state overload relay DC Solid state overload relay

1981-12-14

1983-09-13

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 95, 361 96, 361 97, H02H 7085

Patent

active

044046120

ABSTRACT:
A DC Solid State Overload Relay for use with a DC motor controller is provided with functions to provide instantaneous and delayed tripping of an overload relay by monitoring a standard ammeter shunt signal placed in the power line. The relay circuit uses dropping resistors and a sensing unit with the sensing unit containing separate presetable adjustment for the instantaneous and delayed tripping function and further has automatic reset provisions and a trip indicator which indicates the cause of relay tripping.

REFERENCES:
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patent: 3588978 (1971-01-01), Nye, Jr. et al.
patent: 3604983 (1971-09-01), Levin et al.
patent: 3809985 (1974-05-01), Krause
patent: 3868554 (1975-02-01), Konrad
patent: 3875464 (1975-04-01), Gary et al.
patent: 3919565 (1975-11-01), Clark et al.
patent: 4004201 (1977-01-01), DePuy
patent: 4052625 (1977-10-01), Cameron
patent: 4057842 (1977-11-01), Bauman
patent: 4160282 (1979-07-01), Dolinar
patent: 4217616 (1980-08-01), Jessup

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