Electronic trip unit of a circuit breaker

Details Electronic trip unit of a circuit breaker Electronic trip unit of a circuit breaker

2011-06-21

2011-06-21

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

Reexamination Certificate

active

07965483

ABSTRACT:
An electronic trip unit which includes a processing unit and a comparator circuit. The processing unit receives an input voltage, and a reset signal to reset the electronic trip unit, and generates a trip signal when sensed current of the electronic trip unit exceeds a predetermined threshold. The comparator circuit includes a first comparator which receives the trip signal from the processing unit and compares the trip signal with a predetermined reference voltage determined based on the reset signal, and a second comparator which compares a voltage generated by a power supply with the predetermined reference voltage. The comparator circuit determines whether the trip signal is for a valid trip event based comparison results of the first comparator and the second comparator.

REFERENCES:
patent: 5568343 (1996-10-01), Kosugi
patent: 6252752 (2001-06-01), Nagahama
patent: 6580258 (2003-06-01), Wilcox et al.

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