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 PLC2Day 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

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.

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.

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.

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Last Update: Friday, March 13, 2026