Circuit interrupter trip unit

Details Circuit interrupter trip unit Circuit interrupter trip unit

2005-04-05

2005-04-05

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S103000

Reexamination Certificate

active

06876532

ABSTRACT:
A trip unit for a circuit interrupter includes a power supply, a plurality of input terminals and a plurality of output terminals. A heater conductor is electrically connected between each pair of the input and output terminals. The heater conductor is adapted to generate heat responsive to current flowing through the conductor. A diode is disposed proximate each of the conductors for heating thereby. The diodes are electrically interconnected with the power supply and are adapted to provide a forward voltage representative of the temperature of the corresponding conductor. Another diode is electrically interconnected with the power supply and is adapted to provide a forward voltage representative of ambient temperature. A thermal trip circuit generates a trip signal for the circuit interrupter responsive to the forward voltage of the diodes.

REFERENCES:
patent: 3991391 (1976-11-01), Wafer
patent: 4358810 (1982-11-01), Wafer et al.
patent: 5835320 (1998-11-01), Palmieri et al.
patent: 6137386 (2000-10-01), Mueller

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