The SM1551152K is a Monitoring Relay Tachometer monitors the actual Knob adjustable set level on RPMs of a motor by a relative scale. The relay is controlled by mechanical triggering and operates when the number of R.P.M. exceeds the set value. Controlled by Namur/DIN 19234 sensor or metallic contact Connection for moving-coil instrument LED indication for relay ON AC or DC power supply 10A SPDT output relay 110Ω Internal resistance ≥2kVAC (rms) Dielectric voltage IP20 Protection rating Applications Test & Measurement, Industrial, Motor Drive & Control