NB1G-63 is MCB with overvoltage protection; Suitable for AC 50/60Hz; Rated working voltage 230V, rated current up to 63A; It can protect the circuit from overload, short circuit and overvoltage, and can also be used as an infrequent circuit breaker. Operation conversion; Compliant with standards: IEC 60898-1, and obtained CCC,KC certification.