Circuit breaker with rating plug having memory

摘要

A microprocessor based circuit breaker (1) has a removable rating plug (7) which provides a reference for the current rating of the breaker. The removable rating plug also has an EEPROM (55) to which the microcomputer (27) of the circuit breaker writes for storage, the number of operations of the circuit breaker in the form of a count of the number of trips weighted by the magnitude of the trip current. The rating plug (7) is periodically removed and plugged into a portable programmer (83) which selectively displays the number of operations and operating history of the circuit breaker. The programmer clears this operating data when recorded and may write into the EEPROM the style and serial number of the circuit breaker with which the rating plug is to be used.