!!! product phase-out !!! the preferred successor is 3UG5643-1CS20 digital monitoring relay voltage monitoring, 22.5 mm from 17 to 275 V AC/DC overshoot and undershoot with internal power supply noise pulses delay 0.1 to 20 s hysteresis 0.1 to 150 V 1 changeover contact spring-loaded connection system screw terminal