GKM3 plastic circuit breaker is suited for distribution network of AC 50HZ, rated insulation voltage 800V (control loop insulation voltage 400v),rated working voltage up to 690v. It is applied to distribute electric power and protect the line and the equipment against the damage due to overload, underd-voltage and short circuit. Meanwhile, breaker with intelligent tripper can also selectively protect against the damage of short circuit and single phase earthing. Breakers with frame size rated current 400A and below 400A can be used for protecting mouse-cage type motor's against unfrequently start, break down overload,and under voltage. This breaker conforms to IEC60947-2, GB14048-2. If you are interested,please feel free to contact us: shgk.nick(at) ,thank you very much.