Phoenix Contact PSR-PC20-1NO-1NC-24DC-SC Safety Relay

Phoenix Contact PSR-PC20-1NO-1NC-24DC-SC Coupling Relay – Compact SIL 3 Safety

The Phoenix Contact PSR-PC20-1NO-1NC-24DC-SC coupling relay is a compact safety solution designed for SIL 3 high- and low-demand applications. It securely transfers digital output signals from failsafe controllers to peripheral devices such as valves and actuators, ensuring reliable electrical isolation. With its slim 12.5 mm profile, the unit saves panel space while maintaining strong safety standards. Built with force-guided contacts and an integrated diagnostic path, it supports simplified proof testing and dependable shutdown in “safe state off” applications. Its robust housing and long service life make it a trusted relay for critical industrial safety tasks.

The PSR-PC20-1NO-1NC-24DC-SC coupling relay combines advanced functionality with practical benefits for modern control systems. The internal fuse protection and built-in diagnostic features reduce maintenance effort, while its ability to filter controller test pulses extends component lifespan. Its corrosion-resistant PCB ensures durability, even in challenging operating conditions. By reducing the chance of unsafe switching and simplifying compliance with safety standards, it delivers long-term reliability and cost efficiency. The compact housing allows more devices on a DIN rail without sacrificing performance, making it especially valuable in applications where safety, space savings, and operational uptime are priorities.

Why Phoenix Contact PSR-PC20-1NO-1NC-24DC-SC?
The PSR-PC20-1NO-1NC-24DC-SC is a compact yet powerful safety relay that combines SIL 3 certification with space-saving design. Its robust force-guided contacts, diagnostic output, and corrosion-protected construction deliver long-term reliability in demanding industrial environments. By merging safety, efficiency, and easy testing in a slim 12.5 mm housing, it provides engineers with a smart way to maximize both safety integrity and panel space.

What problem does it solve?
This coupling relay addresses the challenge of safely transmitting control signals from failsafe controllers to field devices while ensuring electrical isolation and system integrity. It prevents unsafe switching, reduces downtime with easy proof testing, and protects devices against false triggering caused by controller test pulses. In short, it solves the dual problem of ensuring safety compliance and operational efficiency in compact, space-limited control panels.

Key Features & Specifications – Phoenix Contact PSR-PC20-1NO-1NC-24DC-SC: 2700577

Download PSR-PC20-1NO-1NC-24DC-SC 2700577 Datasheet

Commercial Information – Phoenix Contact PSR-PC20-1NO-1NC-24DC-SC: 2700577

The Applications of Phoenix Contact PSR-PC20-1NO-1NC-24DC-SC

1. Chemical Plant Emergency Shutdown

In chemical processing, safety depends on fast and reliable shutdown of pumps and valves when abnormal conditions are detected. This coupling relay ensures that digital signals from a failsafe controller are isolated before reaching field devices, preventing dangerous mis-operation. The force-guided contact design guarantees that switching errors are avoided, while the diagnostic path allows operators to identify faults early. By providing dependable SIL 3 safety compliance, the relay strengthens the reliability of emergency shutdown systems and minimizes risks to both personnel and equipment.

2. Wastewater Treatment Flow Control

Large treatment facilities rely on automated pumps and gate valves to manage water flow under changing load conditions. This relay enables safe signal transfer between the controller and actuators while occupying minimal panel space due to its slim 12.5 mm housing. Its built-in test pulse filter prevents false switching, which is common in systems with frequent diagnostic signals. The result is a more stable control process, fewer unplanned stops, and improved protection of critical flow equipment even in high-demand operation.

3. Gas Turbine Safety Interlock System

Gas turbine installations require safety interlocks that immediately shut off fuel supply in case of overheating or excessive vibration. By using this coupling relay, the controller output is isolated from the fuel valve actuator, ensuring a safe and rapid disconnection. The integrated confirmation path provides clear feedback to the safety system, helping detect internal relay issues before they affect operation. This dual functionality both protects the turbine and maintains high availability, reducing the risk of costly downtime.

4. Offshore Oil & Gas Platform Control

Harsh offshore conditions demand components that combine safety, durability, and compact design. This relay is particularly suited for critical shutdown valves on platforms, where space is limited and reliability is non-negotiable. Its corrosion-protected PCB and approvals for hazardous zones make it resilient against marine environments. With integrated fuse protection and robust signal isolation, it prevents false triggering and ensures that shutdown systems operate only when truly required. This improves safety, reduces maintenance efforts, and extends the service life of equipment exposed to challenging conditions.

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