Dual microprocessor electronic trip unit for a circuit interrupter

摘要: An electronic trip unit having two microprocessors one of which monitors the load voltage and current within normal operating range performs metering delayed algorithms associated with that range. A second microprocessor for excursions outside processes those functions instantaneous overcurrent protection modes unit. Each receives inputs representative monitored are scaled to a different factor corresponding assigned monitor. In embodiment is controlled by master controller in turn controls number accessory devices, wherein slave network other network. The communicate each either can circuit on detection fault condition.