PILZ S3UM 24VDC UM 400/440VAC H40 – 837271 | JUAL PILZ S3UM 24VDC UM 400/440VAC H40 – 837271 – Voltage monitoring relay, to monitor overvoltage and undervoltage values, and the phase sequence in 3-phase supplies, 40 -400 Hz, measuring voltage 400/440 V AC, width 22.5 mm, UB = 24 V DC,hysteresis 2%.