!!! product phase-out !!! the preferred successor is 3UG5501-2AW30 analog monitoring relay level monitoring resistance monitoring from 2 to 200 kohm overshoot and undershoot supply voltage 24 V AC/DC 50 to 60 Hz DC and AC without electrical isolation to measuring circuit 2-step or 1-step control tripping delay 0.5 to 10 s 1 changeover contact spring-loaded connection system - Siemens | JRB