NF series moulded circuit breaker is one of the new type products developed by our company through adopting international advanced technology. It applies to the circuit of AC 50/60Hz, rated insulating voltage 800V, rated working voltage up to 690V, rated working current up to 1200A. It is used to distribute electric energy in distribution network and to protect circuits and power supply units from overload, short circuit and undervoltage. It can also be used for infrequent conversion of circuits and infrequent starting motors.