A circuit breaker, having a latching mechanism and a solenoid senses current through a circuit. The sensed current is converted to a proportional voltage. A current rating plug and receptacle system, responsive thereto, provides a standardized voltage. The proportional voltage is applied across a resistor...http://www.google.es/patents/US4347541?utm_source=gb-gplus-sharePatente US4347541 - Circuit breaker
