... methane. In the power supply system of 50 Hz AC, rated voltage of 1140,660 V, the product ... functions of over current, short- circuit, low voltage, phase losing, current leakage interlock, over voltage absorption, triphase imbalance ... Voltage(V)1140,660 Control modesSingle motor-single speed,double motor-single speed,single motor-double speed,double motor-double speed,mixed usageTotal working current ...