STX Series Moulded Case Circuit Breaker(MCCB) is 800v ,suitable for turn-on or turn off not frequency and starting a motor not frequently in the circuit of AC 50hz,rated working voltage 690V;rated working current up to 800A is motor protection-free, The breakers have overload, short -circuit and under voltage protection devices, so as to protect the circuit and the power equipment against damage. עס קאַמפּאָוז מיט IEC60947-2 סטאַנדאַרדס.