CM3 seies moulded case circuit breaker is one of the most advanced type bresker in the world, which adopts international aduanced design and manufacture technology. They are suitable for short circuit and overload protection in circuit of AC690V50/60Hz, rated current from 12. 5A to 630A. Its rated insulation voltage is 690A. It can make and breakthe unfrequently circuit under normal conditions. It takes protecting effect when mouse cage motors unfrequently start, making & breaking and protecting against overload, short circuit and lacking voltage.