Circuit breaker incorporating trip coil as shunt resistor in par

Details Circuit breaker incorporating trip coil as shunt resistor in par Circuit breaker incorporating trip coil as shunt resistor in par

1996-05-20

1997-09-16

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219481, 219514, 219504, H05B 102

Patent

active

056677111

ABSTRACT:
A solenoid trip unit is electrically connected in parallel with a current limiting polymer element in series with circuit breaker contacts to function as a shunt resistance for the polymer element, becoming energized by transition of the polymer element to its high resistive state, for tripping the breaker contacts open upon such transition. The solenoid may be particularly wound with a resistive wire.

REFERENCES:
patent: 4321447 (1982-03-01), Lamb
patent: 4886955 (1989-12-01), Kimura
patent: 5471035 (1995-11-01), Holmes
patent: 5493101 (1996-02-01), Innes

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