Description
Overview
The MSI-SR4B-02 Safety Relay delivers reliable control and monitoring for high-demand safety applications. Designed for precision, it provides dependable protection in systems that require fast response, consistent diagnostics, and compliance with stringent international safety standards.
Performance and Safety
With a response time of just 10 ms, this relay ensures immediate reaction during critical events. It supports emergency stops, safety switches, light barriers, and laser scanners, making it a versatile choice across multiple automation environments. The automatic or manual start options (300 ms and 30 ms pickup delays, respectively) give users full flexibility in adapting the relay to their system’s operational needs.
The MSI-SR4B-02 meets SIL 3 / SILCL 3 and Cat. 4 / PL e safety levels, ensuring top-tier compliance for industrial applications. Its built-in functions, cross-circuit monitoring, restart interlock, automatic start/restart, and contactor monitoring (EDM), help maintain uninterrupted system safety while minimising downtime.
Design and Reliability
Operating on a 24V AC/DC supply, the unit consumes just 3W, maximising energy efficiency without compromising output reliability. It provides three safety-related switching outputs (OSSDs), one signal contact, and utilises a spring-cage terminal connection for secure installation.
The unit’s LED display with four indicators simplifies diagnostics and maintenance, while its IP20/IP40 protection ensures resilience against dust and environmental factors. Certified by TÜV NRTL US, TÜV Süd, and cUL US, it guarantees global compliance for both North American and European markets.
Key Specifications
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Model: MSI-SR4B-02
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Response Time: 10 ms
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Voltage: 24 V AC/DC
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Safety Outputs: 3 (Relay, NO)
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Certifications: TÜV, UL
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Protection: IP20 (terminals), IP40 (housing)
Conclusion
Compact, precise, and safety-certified, the MSI-SR4B-02 Safety Relay is the ideal solution for automated systems demanding speed, reliability, and compliance, ensuring safety without sacrificing productivity.
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