Patent ID: 6621672
Filing Date: 2003-09-16
Classification: H02H

Abstract:
A circuit breaker having a trip mechanism and a power line for carrying a power signal from a source to a load and a current transformer configured to sense the power signal and provide a sense signal representative of the power signal to an electronic module in the circuit breaker, with the electronic module having a circuit common potential, an application specific integrated circuit (ASIC), a control circuit, a composite circuit which generates a composite signal voltage, and a residual circuit, comprising:a first power supply to provide a first voltage signal; a second power supply to provide a second voltage signal; an analog override circuit configured to receive the first voltage signal from the first power supply, the second voltage signal from the second power supply and the composite signal voltage from the composite circuit, and to provide an override signal to the ASIC; and, a logic function configured to receive a first trip signal from the control circuit and a second trip signal from the ASIC and to provide a third trip signal to the trip mechanism.