... 160A~630A mainly used as power switch, isolating switch and emergency switch with function of protection in the ... motor.When isolator knife replace fuse, this switch does not have the electric circuit to overload ... protection function,only satisfies the rating which this switch stipulated to put through with the minute ... 400A and NT3 for 630ARated currents: 4, 6, 10, 16, 20, 25, 32, 35, 40, 50, 63, ...