Combination motor controller including resistor shunted fusible

Details Combination motor controller including resistor shunted fusible Combination motor controller including resistor shunted fusible

1973-05-29

1976-10-19

Miler, J D

317 13B, 317 40A, 317 38, H02H 7085

Patent

active

039873404

ABSTRACT:
A combination motor starter connecting a three-phase motor to a source capable of delivering short circuit currents of approximately 100,000 amps is constructed of a molded case circuit breaker having a magnetic trip means, an electromagnetic contactor, overload relay means, and fusible short circuit protector means, all connected in series. The overload relay means brings about opening of the contactor upon the occurrence of overload currents, the magnetic trip means brings about opening of a circuit breaker upon the occurrence of fault currents that the other elements of the starter circuit can withstand without damage for as much as one cycle, and the protector means opens the circuit under severe fault current conditions in a time interval sufficiently short to prevent destruction of any reusable circuit elements. Each pole of the protector means includes a fusible element connected in parallel with a resistor. Upon the occurrence of a severe fault current, the fusible element ruptures and thereafter current is limited by a resistor, in parallel with the element, to a value in the fault current range. This fault current through the resistor is of a duration sufficient to cause opening of the circuit breaker and also cause destruction of the resistor.

REFERENCES:
patent: 2358215 (1944-09-01), Darling
patent: 2502992 (1950-04-01), Rawlins et al.
patent: 2653203 (1953-09-01), Kozacka
patent: 2823338 (1958-02-01), Edsall
patent: 2920164 (1960-01-01), Edsall
patent: 2920241 (1960-01-01), Jacobs, Jr. et al.
patent: 2965809 (1960-12-01), Edsall
patent: 3193730 (1965-07-01), Martin

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