M1 Series moulded case circuit breaker is one of products developed and manufactured by adopting international advanced technology. lt is supplied with rated insulating voltage up to 800V and used for circuit of AC 50/60Hz, rated operating voltage AC 400V(or below), rated operating current up to 1600A for infrequent changing over and starting of the motors. The products conform to IEC60947-2 standard.

Note:
The N line of four poles breaker is at the right side of the product which has four types:
Type A: N line doesn’t have over-current protection, N line can’t be opened.
Type B: N line doesn’t have over-current protection, N line can be opened.
Type C: N line has over-current protection, N line can be opened
Type D: N line has over-current protection, N line can’t be opened.

The thermodynamic release of a circuit breaker provides the feature of inverse time-delay, while the magnetic release is the instantaneous operation as showed on the following tables.