M5 series circuit breakers are mainly used for overload,undervoltage and short-circuit protection of distribution energy and protection lines and power equipment in distribution networks with AC 50Hz (or 60Hz),rated insulation voltage 800V,rated working voltage 690V and below,and rated current 1250A and below.Circuit breakers with 400A shell level and below can also be used for overload,undervoltage and short-circuit protection of motors.Under normal conditions,it can be used as infrequent switching of lines and infrequent starting of motors.

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