Digital monitoring relay voltage monitoring, 22.5 mm from 0.1 to 60 V AC/DC overshoot and undershoot 24 V AC/DC DC and AC 50 to 60 HZ spike delay 0 to 20 s hysteresis 0.1 to 30 v 1 changeover contact with or without error log screw terminal follow-on product for 3ug3531-1AC..