The Wieland safe RELAY series is a comprehensive and modular DIN rail safety relay platform designed to provide customized, high-integrity safety solutions for the protection of personnel and machinery. Unlike a single-function device, the safe RELAY family encompasses a wide range of specialized units, all sharing a compact 22.5mm wide housing and a common design philosophy. These devices combine excellent technical performance with flexible usage and variable connection options, making them a cost-effective and space-saving choice for implementing safety functions up to Performance Level e (PL e) and Safety Integrity Level 3 (SIL 3).

The platform is structured into several functional groups to address diverse safety requirements. Basic devices of the SNA, SNO, SNS, SNT, and SNZ families feature safe internal logic for monitoring functions like emergency stops, guard doors, light curtains, and two-hand controls. For applications requiring controlled stopping, the SNV family provides basic devices with integrated time-delay functions, allowing the safe outputs to be de-energized after an adjustable delay. The SNE family serves as contact expansion relays, featuring a redundant internal structure to multiply the number of safe contacts available from a basic unit. Finally, the SVM family provides dedicated standstill monitors for safely detecting when a motor has come to a complete stop, using back-EMF sensing without the need for external sensors.

All safe RELAY devices are engineered for reliable performance in demanding industrial environments. Standard units offer a switching capacity of 6 A at 230 V AC, while select models like the SNE1 provide higher ratings up to 8 A at 250 V AC. The devices are available with pluggable screw-clamp or spring-clamp terminals, minimizing assembly effort and downtime during maintenance. Clear LED status indicators on the front panel provide immediate visual diagnostics for supply voltage and safety circuit states. With a mission time of 20 years and compliance with international standards including EN ISO 13849-1 and EN 62061, the safe RELAY series is TÜV type-tested and approved for safety-oriented applications across a broad range of industries.

The Wieland safe RELAY series is an ideal foundation for machine safety circuits in packaging machinery, material handling systems, elevator controls, and general factory automation. Its modular approach allows system designers to select the precise combination of monitoring, timing, and contact expansion units needed for a specific application, without paying for unnecessary functionality. By combining compact DIN rail mounting, flexible connection options, and a comprehensive portfolio of certified safety functions, Wieland provides a reliable and economical path to achieving the highest levels of functional safety in industrial machinery.

Technical Specifications