Improvements to a rating plug for an electronic trip unit of a circuit breaker are disclosed. The rating plug includes a non-volatile memory which has access to current and frame rating information. A microcomputer in the electronic trip unit may receive new current rating information over the World...http://www.google.es/patents/US6836396?utm_source=gb-gplus-sharePatente US6836396 - World wide web enabled and digital rating plug
