Importance

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Abstract

A circuit switching device or circuit breaker with integrated self-test enhancements is disclosed having separable contacts operable under processor control to control power to a circuit responsive to at least one of a plurality of fault conditions and operable according to a method for testing, including the steps of: controlling the switching device during a sampling cycle, to input one or more operating parameters sensed in the circuit to an A/D converter for measurement wherein the operating parameters enable detection of the fault conditions; determining whether to read a select one of the operating parameters from an output of the A/D converter into a first memory; and reading pre-determined parameter values from a second memory into the first memory during the sampling cycle instead of the operating parameters read from the A/D converter if a self-test has been invoked during the sampling cycle.

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First Claim