... less. 1,Scope of ApplicationCEM1 series moulded case circuit breaker(hereafter called circuit breaker), is suitable for the circuit of AC50Hz/60Hz, rated current ... 630A, rated operating voltage 690V or less. The series circuit breaker, in the distribution network, can be used for ... can also be sued for making and breaking the circuit frequently.Products conform to IEC 60947-2,60947-4.