Product Overview

The ReLy safety relay from SICK is a reliable, certified safety component designed to ensure safe operation in industrial environments. It provides secure enabling current paths for safety-related functions while integrating diagnostic outputs and test pulse capabilities. Compatible with safety sensors featuring potential-free outputs, the ReLy ensures compliance with ISO 13849-1 standards, offering a mission time of up to 20 years. With robust electrical design and proven performance under demanding conditions, it supports safe control circuits in machinery and equipment where fail-safe operation is critical. The relay features both N/O contacts and push-pull semiconductor outputs for flexibility in circuit design, ensuring high reliability and long-term safety assurance.

Key Features and Technology

The ReLy safety relay incorporates advanced safety technology to ensure dependable performance over its entire lifecycle. It supports three enabling current paths for safe operation, with a response time of just 12 ms when opening the enabling current paths. The device includes two application diagnostic outputs (not safe) for monitoring system health and one input for reset pushbutton or external device monitoring (EDM), enhancing operational transparency. Outputs are designed as positively guided N/O contacts made from silver alloy with gold flashing, ensuring excellent conductivity and corrosion resistance. A short-circuit protected push-pull semiconductor output ensures safety even under fault conditions. The relay operates within a supply voltage range of 16.8 V to 30 V DC (VS = 24 V DC), maintaining stable performance with residual ripple ≤ 2.4 V.

Technical Characteristics

The ReLy safety relay is engineered for high reliability and compliance with international standards. It operates on PELV or SELV voltage systems, ensuring safe isolation from hazardous voltages. The input voltage ranges from 11 V to 30 V DC (HIGH) and –3 V to 5 V DC (LOW), with an input current of 4 mA to 6 mA. Output voltage is maintained at ≥ VS – 3 V under HIGH conditions. Switching capabilities include voltages up to 230 V AC and currents up to 6 A, with a total current consumption of 12 A. The overvoltage category is classified as III (EN 60664-1), and it has a rated impulse withstand voltage of 6 kV. All outputs are protected against short circuits, ensuring safe operation even under fault conditions.

Configuration and Integration

The ReLy safety relay is designed for straightforward integration into existing safety systems. It features a front connector with spring terminals, enabling secure and easy connection to compatible safety sensors with potential-free outputs. The device includes one input for reset pushbutton or external device monitoring (EDM), allowing flexible reset functionality. Two application diagnostic outputs (not safe) provide real-time system diagnostics without compromising safety integrity. With a push-pull semiconductor output, the relay supports efficient signal transmission while maintaining high reliability. Integration is simplified by standard voltage compatibility and clear electrical specifications, ensuring compatibility with common industrial safety circuits.

Operating Environment

The ReLy safety relay is designed to operate reliably in typical industrial environments. It functions within a supply voltage range of 16.8 V to 30 V DC (VS = 24 V DC), ensuring stable performance under varying conditions. The device is rated for overvoltage category III and has a rated impulse withstand voltage of 6 kV, making it suitable for use in environments with potential electrical transients. Its robust construction supports operation in standard industrial settings where temperature, humidity, and vibration levels are within typical ranges. No specific environmental ratings beyond standard industrial conditions are provided, but its design ensures long-term performance under normal operating conditions.

Industrial Applications

The ReLy safety relay is ideal for use in machinery and equipment requiring fail-safe operation. It is commonly applied in automated systems where safety sensors monitor critical parameters such as machine position or emergency stops. The device supports integration with safety circuits that require enabling current paths, diagnostics, and reset functions. Its compatibility with potential-free safety sensors makes it suitable for a wide range of industrial applications including material handling, packaging, and manufacturing lines. With its 20-year mission time (ISO 13849-1), the ReLy ensures long-term safety performance without frequent maintenance or replacement.