Abstract: A method for testing low voltage power circuit breakers having an electronic trip unit which includes a display and a microprocessor for controlling various protective functions and storing settings for such functions which can be selected and performed. Entering into the test mode disables functions not necessary for the testing to be performed. A current is injected into one of the phases of the breaker. The technician observes whether the breaker performs within the specifications for the selected protective function. Upon exiting the test mode, the breaker is automatically restored to the settings prior to the testing.

Abstract: A switchgear installation has a cubicle with a door to provide access thereinto, and a low voltage circuit breaker is mounted therein and accessible through the door. Coupled to the circuit breaker is a logic module, and a portable user interface module is releasably mounted on the exterior of the cubicle and operatively connected to the logic module to display information concerning the operation of the breaker and to provide an interface for the user to interact with the logic module and thereby with the breaker. The user interface module includes a battery providing the required power for setting and monitoring the functions of the breaker.

Abstract: A method for testing low voltage power circuit breakers having an electronic trip unit which includes a display and a microprocessor for controlling various protective functions and storing settings for such functions which can be selected and performed. Entering into the test mode disables functions not necessary for the testing to be performed. A current is injected into one of the phases of the breaker. The technician observes whether the breaker performs within the specifications for the selected protective function. Upon exiting the test mode, the breaker is automatically restored to the settings prior to the testing.

Abstract: A switchgear installation has a cubicle with a door to provide access thereinto, and a low voltage air circuit breaker is mounted therein and accessible through the door. Coupled to the circuit breaker is a logic module, and a portable user interface module is releasably mounted on the exterior of the door and operatively connected to the logic module to display information concerning the operation of the breaker and to provide an interface for the user to interact with the logic module and thereby with the breaker.