!!! product phase-out !!! the preferred successor is 3UG5651-1CW30 digital monitoring relay speed monitoring from 0.1 to 2200 r/min overshoot and undershoot 24 to 240 V AC/DC 50 to 60 Hz DC and AC ON-delay 1 to 900 s tripping delay 0.1 to 99.9 s hysteresis 0.1 to 99 r/min 1 changeover contact with or without fault buffer screw terminal - Siemens | JRB