PILZ S1UK 24VACDC 120/240VAC 838000

Pilz S1UK 838000 Voltage Monitoring Relay Description The Pilz S1UK, with part number 838000, is a robust and reliable undervoltage monitoring relay designed for industrial applications. It ensures the operational safety of machines and systems by monitoring single-phase or three-phase AC mains for undervoltage conditions. With a supply voltage of 24V AC/DC and a measuring range of 120/240V AC, this DIN-rail mountable unit is a versatile solution for protecting equipment from potentially damaging voltage drops. Order now from profideals for expert support and fast delivery. Specifications Manufacturer: Pilz Model: S1UK Part Number (Ident.No.): 838000 Supply Voltage: 24V AC/DC Monitored Voltage Range: 120/240V AC Frequency: 50-60 Hz Output Contact: 1 N/O contact Contact Rating (AC15): 230V, 2A Contact Rating (DC13): 24V, 1.5A Mounting: DIN Rail Label Info S1UK 24VACDC 120/240VAC UM 1VAC/DC Ident.No.: 838000 DIN VDE 0110 4kV/3 Application This relay is ideally suited for monitoring power supplies in control cabinets, protecting motors, transformers, and other sensitive electronic equipment from undervoltage events that could lead to malfunction or damage. Country of Origin Made in Germany. CO2 Impact Opting for this pre-owned unit prevents the emission of approximately 6.0 kg of CO2 compared to manufacturing a new one. This saving is equivalent to the energy needed to charge a smartphone over 720 times. Availability This is an obsolete item but is available from our stock. We ensure all our refurbished products are tested and functional, offering a reliable alternative to sourcing new parts. FAQ What is the main difference between the S1UK and a modern Pilz PMD relay?The S1UK is an older, obsolete model. Modern PMD relays offer enhanced features like broader setting ranges, digital displays on some models for easier diagnostics, potentially smaller footprints, and compliance with the latest safety and performance standards. How do I set the undervoltage trip point and hysteresis on this S1UK relay?The trip point (U) and hysteresis (Hyst) are adjusted using the potentiometers located on the top face of the unit. You will need a small flat-blade screwdriver to make precise adjustments according to your application’s voltage requirements, as detailed in the product’s technical manual. Can this relay be used for three-phase monitoring without a neutral connection?Yes, the S1UK is designed to monitor single-phase or three-phase systems. For three-phase monitoring without a neutral, you connect the three phases to the designated terminals as per the wiring diagram. The relay then monitors the phase-to-phase voltage. profideals is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners. Last Update: Friday, March 13, 2026