Abstract: A method and apparatus for an undervoltage relay control apparatus monitoring voltage of the circuit breaker. The undervoltage relay controller apparatus comprises a housing with a latch assembly mounted in the housing. The latch assembly includes a latch mechanism and a solenoid, with the solenoid in selective contact with the latch mechanism. An electrical circuit, having a voltage input and a voltage output is mounted in the housing and coupled to the latch assembly. Wherein a control voltage input to the electrical circuit is conditioned, independently of parameters of the solenoid, and wherein if the received control voltage input is less than a predefined voltage, the electrical circuit will remove power to the solenoid allowing the solenoid to contact the latch mechanism and trip the circuit breaker.

Abstract: A logging device for a trip unit records temporal information related to a circuit breaker trip event, with the circuit breaker (11) including a trip unit (12). The device (10) includes at least a clock circuit (13), a microcontroller (14), and a storage medium (15). The device (10) can be configured as either a plug-in module for the trip unit (12), or as an accessory is mounted on the panel proximate to and in communication with the trip unit (12). The clock circuit (13) generates signals representing temporal information, such as real-time date and time information. The microcontroller (14) is adapted to be coupled to the trip unit (12) to receive signals from the trip unit (12). These signals from the trip unit (12) indicate a circuit breaker trip event. The microcontroller (14) receives the time and date information from the clock circuit (13) and associates a given trip event with the time and date information related to that given trip event.