H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/14
H02H 3/093 (2006.01) H02H 6/00 (2006.01)
Patent
CA 1320560
ABSTRACT OF THE DISCLOSURE A circuit breaker with over-temperature protector and low error I2t calculator is provided. The over- temperature protector includes a fixed current source which provides current to a resistive element to produce a voltage which thereacross increases with a positive temperature coefficient as the surrounding temperature increases. The resistor is connected to the base-to-emitter circuit of a transistor. The base-to-emitter circuit has a minimum firing voltage which decreases with an increase in ambient temperature. The value of the resistive element, the amount of current provided by the fixed current source and the transistor base-to-emitter minimum firing voltage are chosen to cause a circuit breaker to be actuated. There is also provided an active memory device which is utilized to discharge a capacitor with a time constant which approximates the heat dissipating time constant associated with a conductor to be protected by the circuit breaker in question.
588776
Riches Mckenzie & Herbert Llp
Westinghouse Electric Corporation
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