PILZ S1UM 230-240VAC UM 0.1-500VAC/DC UP – 827265 | JUAL PILZ S1UM 230-240VAC UM 0.1-500VAC/DC UP – 827265 – Voltage monitoring relay, to monitor min. and max. voltage values, 12 measuring ranges 0.1 – 500 V AC/DC selectable, 0.40 -400 Hz, width = 22.5 mm, UB = 230 – 240 V AC, measuring inputs are not polarity-sensitive.