EM series motor protection On/Off switches can be supplied in 10 setting ranges from 0.3 to 16 amps. In addition to thermal triggering, the switch can also be supplied with quick KA magnetic triggering or UA low-voltage triggering. Operation by means of insulated T-handle is via a robust switching latch with rotary drive. In the version with low-voltage triggering the EM switches ensure the protection called for in the DIN EN 60204 Part 1 provisions against automatic restarting when power is restored following a power cut. The nominal frequency is 50 Hz. Switches for other voltages with a frequency of 50 or 60 Hz can also be supplied on request.