The Pilz S3UM 230VAC UM 415/460VAC is a monitoring relay engineered for reliable supervision of three-phase voltage supplies in industrial automation. As part of the Pilz monitoring device portfolio, it provides dependable protection against irregularities in electrical supply systems, ensuring both equipment safety and uninterrupted production processes.

Operating on a 230 V AC supply voltage, the relay monitors higher-level three-phase networks of 415 V and 460 V AC, making it particularly suitable for heavy-duty industrial applications. By continuously checking supply conditions, it offers early detection of faults such as undervoltage, overvoltage, or asymmetry, ensuring corrective action can be taken before failures escalate into costly downtime or equipment damage.

The relay contact system highlights its robust design. Contacts are made from AgCdO (silver cadmium oxide), a material valued for its excellent conductivity and arc resistance. To further enhance reliability, especially in low-load switching applications, an additional +3.0 µm gold layer is applied. This combination ensures superior performance, long service life, and consistent contact behaviour, even under demanding operating cycles.

Compliance with international standards strengthens its application versatility. Certified to EN 60947-4-1 (AC/DC1 utilisation category), the device is proven safe for general resistive and inductive loads. Its certification under EN 60947-5-1 (AC15/DC13 utilisation categories) confirms suitability for control circuit applications, such as relay and contactor actuation. This dual compliance makes it adaptable to a broad range of monitoring and switching scenarios.

The S3UM is also built to withstand environmental stress, meeting EN 60068-2-78 climatic suitability standards. This ensures reliable operation in challenging industrial conditions, such as high humidity or fluctuating temperatures, making it a dependable solution across diverse industries.

Typical applications include motor protection, power distribution supervision, process automation, packaging machinery, and heavy manufacturing systems, where stable three-phase supplies are critical for safe and efficient operation. By combining robust voltage monitoring with reliable relay switching, the device plays a key role in preventing downtime and ensuring operator safety.

In summary, the Pilz S3UM 230VAC UM 415/460VAC monitoring relay delivers wide-range supply supervision, durable relay contact technology, international standards compliance, and strong environmental resilience. With its ability to monitor 415 V and 460 V three-phase systems while operating from a 230 V AC supply, it offers a versatile and dependable solution for safeguarding critical equipment and processes in demanding industrial environments.