Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1980-09-18
1982-08-10
Miller, J. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
F16K 1736, H01H 4732
Patent
active
043441025
ABSTRACT:
An anti-telegraph circuit for locking out the circuit controlling the flow of direct current in a coil winding of an electromagnetically operated switching device, such as a contactor, from an alternating current source whenever improper control voltages are present which would cause repeated operations of the armature picking up and falling out of its sealed position.
REFERENCES:
patent: 3790862 (1974-02-01), Kampf et al.
patent: 3909681 (1975-09-01), Campari et al.
patent: 4263928 (1981-04-01), Kobayashi et al.
Kampf Julian C.
Lemke Winfred R.
Libert James T.
Femal Michael J.
Miller J. D.
Schroeder L. C.
Square D Company
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