- ERM1 series moulded case circuit breaker ( hereinafter referred to as the circuit breaker ),is suitable for occasional conversion and motor start ( Inm<=630A type and below )under the circuit of AC 50Hz/60Hz,rated insulation voltage of 690V(500V for ERM1-63),rated operational voltage of 400V and below and rated current to 1250A.The circuit breaker has protection function to avoid overload ,short circuit and under-voltage,for assuring the prevention from damage of circuits and power-supply devices . - The circuit breaker can be classified into three types of L (standard),M (moderate high breaking )and H (high breaking )according to the rated limit short circuit breaking capacity ( Icu).It has features of small volume ,high breaking and short flashover ,vibration resistance ,etc . - It can can be installed vertically (vertical assembly )or horizontally (horizontal assembly ).It has isolation function. - The circuit breaker conforms to requirements of IEC 60947-2 and GB14048.2 standards.