Phoenix Contact PSR-PC50-1NO-1DO-24DC-SC Coupling Relay

Phoenix Contact PSR-PC50-1NO-1DO-24DC-SC Coupling Relay for SIL 3 Safety

The Phoenix Contact PSR-PC50-1NO-1DO-24DC-SC coupling relay is a compact safety component designed to connect failsafe controllers with field devices such as actuators and valves. With a slim 17.5 mm housing, it delivers dependable signal coupling and electrical isolation for demanding automation tasks. Certified for use in SIL 3 low-demand environments, the relay integrates diagnostic contacts and proof-test functions that streamline compliance with functional safety standards. Engineered for Zone 2 installation and built with force-guided contacts, it ensures reliable switching and safe separation of control and power signals in industrial safety applications.

The Phoenix Contact PSR-PC50-1NO-1DO-24DC-SC is more than just a coupling relay—it is a reliable safeguard for critical industrial systems. Its design includes a test pulse filter and status feedback, helping maintenance teams verify safety performance quickly and without lengthy system downtime. The relay’s high switching capacity and robust electromechanical design make it suitable for continuous use in process industries, fire and gas protection systems, and machine safety. Easy DIN-rail mounting, compact dimensions, and clear LED indicators provide straightforward installation and rapid fault detection, reducing operational risk while ensuring safe and stable system performance.

Why Phoenix Contact PSR-PC50-1NO-1DO-24DC-SC?
The Phoenix Contact PSR-PC50-1NO-1DO-24DC-SC stands out as a compact yet powerful coupling relay built for mission-critical safety systems. It combines force-guided contacts, diagnostic monitoring, and SIL 3 certification into a slim 17.5 mm design that saves space without sacrificing reliability. This makes it a trusted choice for engineers who want both compliance and long-term system dependability in a single safety component.

What problem does it solve?
In modern automation, safely linking failsafe controllers with field devices is a major challenge. The PSR-PC50-1NO-1DO-24DC-SC solves this by delivering reliable electrical isolation and robust signal coupling, even in hazardous areas. It prevents unsafe signal transfer, simplifies proof testing, and minimizes downtime—offering industries a cost-effective way to meet strict safety standards while maintaining efficient and uninterrupted operations.

Key Features & Specifications – Phoenix Contact PSR-PC50-1NO-1DO-24DC-SC: 2904664

Download PSR-PC50-1NO-1DO-24DC-SC 2904664 Datasheet

Commercial Information – Phoenix Contact PSR-PC50-1NO-1DO-24DC-SC: 2904664

The Applications 

1. Emergency Shutdown in Chemical Processing

Chemical plants demand quick and reliable intervention whenever process variables exceed safe limits. In these facilities, emergency shutdown valves must be activated instantly if pressure or temperature spikes occur. The PSR-PC50-1NO-1DO-24DC-SC acts as a secure bridge between a failsafe controller and valve actuators, ensuring signals are isolated and transferred without fault propagation. Its built-in diagnostic contact supports regular proof testing, helping operators confirm system health. By combining fast switching with electrical isolation, it reduces the risk of equipment damage and process incidents while keeping the safety loop compliant with international standards.

2. Fire and Gas Monitoring Offshore

On offshore drilling and production platforms, fire and gas detection networks are mission-critical. Signals from detectors must be reliably transmitted to shutdown systems operating in hazardous environments. The PSR-PC50-1NO-1DO-24DC-SC provides the safe coupling of these digital outputs, ensuring that actuators for fire dampers or gas shutoff valves receive commands without exposing the main control system to risk. Its approval for Zone 2 environments and integrated test pulse filter help operators maintain continuous protection. The result is dependable alarm handling, reduced false trips, and assurance that emergency functions perform correctly when needed most.

3. Safety Guarding in Automotive Assembly

Automotive assembly lines rely on safety switches and light curtains to protect workers around robotic arms and moving equipment. For these signals to disable drives quickly and safely, a coupling relay is required. The PSR-PC50-1NO-1DO-24DC-SC translates the failsafe controller’s output into a reliable enabling path, with SIL 3 capability ensuring compliance with stringent safety performance levels. Its compact width saves space in crowded panels, while LED indicators allow technicians to verify status at a glance. This combination of space efficiency and robust safety performance helps manufacturers keep production flowing while maintaining strict worker protection standards.

4. Boiler and Burner Safety in Power Generation

In power plants, boiler systems operate under strict safety interlocks involving flame detection, fuel valves, and burner control logic. The PSR-PC50-1NO-1DO-24DC-SC plays a vital role by safely coupling the control signals that authorize fuel delivery only when conditions are proven safe. Its switching capacity supports direct actuation of solenoids, while its force-guided contacts ensure failures are detected before they compromise the system. By enabling quick proof tests and offering stable operation across harsh temperature ranges, the relay helps minimize downtime. Power plants benefit from continuous, compliant operation while reducing the risk of dangerous combustion incidents.

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