Patent ID: 7940051

Claim:
In a method for testing low voltage power circuit breakers, the steps comprising: (a) providing a low voltage circuit breaker with an electronic trip unit including a microprocessor for controlling various protective functions and storing settings for such functions which can be selected and performed, said trip unit including a display; (b) entering a test mode in which the microprocessor automatically disables trip logging, trip counting, ground fault detection and other functions not necessary for the testing to be performed; (c) actuating at least one of the protective functions selected from the group consisting of long time, short time, instantaneous, ground fault and phase imbalance; (d) injecting into one of the phases of said breaker and trip unit a current and observing whether the breaker performs within specifications for the selected protective function; and (e) exiting the test mode with the microprocessor automatically resetting the breaker to the settings prior to the testing.