Module plug for an electronic trip unit

摘要

An electronic trip unit (22) for a circuit breaker (20) includes: a microprocessor (110) programmed to determine an overcurrent condition of the circuit breaker (20); a nonvolatile memory (115) in electronic communication with the microprocessor (110); and a module plug (60) releasably engaged with the microprocessor (110). The module plug (60) includes an identification register (118), and the microprocessor (110) reads the identification register (118) which includes an identification number. The microprocessor (110) accesses one of a plurality of programs (120) in the nonvolatile memory (115) based on the identification number, and one of a plurality of programs (120) instructs the microprocessor (110) to perform steps necessary to operate one or more functions of the module plug (60).