PILZ-837251 Pilz Voltage Relays

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Pilz PILZ-837251 is a protection unit designed for 3-phase voltage monitoring, including overvoltage and undervoltage monitoring functions. It is suitable for DIN rail mounting and operates within an ambient air temperature range of -15 to +55°C. The unit has a net height of 87 mm and supports safety output contacts ratings from 0.1A to 5A at 24Vdc (DC-1; 120W) and 1.5A at 24Vdc (DC-13). Connection is facilitated through fixed screw terminal connections. As part of the S3UM sub-range, it measures 22.5mm in width, offers an IP40 degree of protection, and requires a supply voltage of 20.4-26.4Vdc (24Vdc nominal) with a frequency measuring range of 40-400Hz. The housing is made from PPO material, and the unit is designed for a 3-phase (3AC) input network with a 230Vac measuring voltage. It has a net width of 22.5 mm, a power consumption of 1.5 W, and a net depth of 122 mm. Operating modes include fault latching/non-latching and normally energized/de-energized modes. The unit can be stored in temperatures ranging from -40 to +85°C. It features 1 x delayed auxiliary output (SPDT-NO/NC contacts; 0.1-5A 24Vdc DC-1 resistive load; 0.5-10s time-delay selectable (ON-delay energization)), 1 x analog input (L1-L3 voltage measurement), and digital inputs for 1 x automatic reset (Y1-Y2 linked) and 1 x switching commutation (Y2-Y3). Protection functions cover undervoltage, overvoltage, phase sequence, phase failure, and asymmetry.