ZTM8(NS) series moulded case circuit breaker is one of the most advanced type breaker in the world, which adopt international advanced design and manufacture technology. They are suitable for short circuit and overload protection for circuit of AC 690V, 50/60Hz, rated current from 12.5A to 630A. Its rated insulation voltage is 690V. It can make and break non-frequently circuit in the normal conditions. It takes protect effect when mouse cage motors non-frequent start, breaking off working and protecting overload, short circuit and under voltage.