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

Phoenix Contact PSR-PC50-1NO-1DO-24DC-SP Coupling Relay – SIL 3 Safety Performance

The Phoenix Contact PSR-PC50-1NO-1DO-24DC-SP coupling relay is a compact safety module designed to reliably couple digital output signals in functional safety systems. Built to meet SIL 3 requirements under IEC 61508, it ensures safe isolation and adapts signal levels between controllers and connected devices such as valves or actuators. With a slim 17.5 mm housing, pluggable push-in terminals, and an integrated test pulse filter, the relay is optimized for space-saving installation and dependable performance. Its proven design makes it well-suited for demanding fire and gas systems as well as industrial environments that require maximum reliability.

The PSR-PC50 coupling relay delivers a practical balance of safety, efficiency, and durability for industrial control applications. Featuring force-guided contacts and integrated diagnostics, it simplifies proof testing and reduces the time required for system verification. The relay’s rugged construction allows use across a wide operating temperature range, ensuring continuous performance even under challenging site conditions. Its ability to connect failsafe controllers to field devices helps prevent unplanned downtime while ensuring compliance with stringent safety regulations. Quick DIN rail installation and straightforward wiring reduce commissioning effort, making it an excellent choice for facilities where safety and operational continuity are top priorities.

Why Phoenix Contact PSR-PC50-1NO-1DO-24DC-SP?

The Phoenix Contact PSR-PC50-1NO-1DO-24DC-SP is more than just a coupling relay—it’s a safety backbone for critical automation systems. With SIL 3 certification, force-guided contacts, and diagnostic functions, it gives engineers the confidence that signals between controllers and field devices are transmitted safely and reliably. Its compact width saves space in control cabinets, while push-in terminals and simplified proof testing lower installation and maintenance costs. This makes it a smart choice where both performance and safety compliance matter most.

What Problem Does It Solve?

In many industrial environments, signal integrity between failsafe controllers and actuators can be a weak link, leading to risks of malfunction, downtime, or safety breaches. The PSR-PC50 coupling relay solves this by ensuring electrical isolation, safe power adaptation, and reliable signal transmission even under demanding conditions. It prevents false triggering from test pulses, adapts control outputs to field device requirements, and guarantees safety integrity. By doing so, it eliminates costly failures and provides a dependable interface between control systems and the equipment they safeguard.

Key Features & Specifications – Phoenix Contact PSR-PC50-1NO-1DO-24DC-SP: 2904665

Download PSR-PC50-1NO-1DO-24DC-SP 2904665 Datasheet

Commercial Data – Phoenix Contact PSR-PC50-1NO-1DO-24DC-SP: 2904665

The Applications of Phoenix Contact PSR-PC50-1NO-1DO-24DC-SP Coupling Relay

1. Fire and Gas Safety Systems

In oil, gas, and chemical facilities, fire and gas detection systems must activate valves or alarms without failure. The PSR-PC50 ensures that output signals from a failsafe controller are safely isolated and power-adapted before reaching the valve coils or sirens. Its SIL 3 certification supports compliance with international safety standards, while the integrated test pulse filter prevents nuisance triggering during diagnostics. The force-guided contacts provide assurance that even under demanding operating conditions, shutdown actions will perform correctly. This significantly reduces the risk of false alarms or system downtime in safety-critical environments.

2. Emergency Shutdown in Petrochemical Plants

Petrochemical production processes require rapid and dependable shutdown mechanisms to avoid catastrophic accidents. The PSR-PC50 coupling relay acts as a reliable link between the safety PLC and actuators responsible for isolation or venting. Its compact housing allows installation in dense marshalling panels, while LED indicators provide clear feedback on system status. With SIL 3 capability and diagnostic features, operators can perform proof testing without disrupting ongoing operations. By ensuring signals are transferred accurately and with proper electrical isolation, the relay plays a vital role in protecting personnel, equipment, and the environment from unexpected hazards.

3. Burner Management for Industrial Boilers

Industrial boilers in power plants or manufacturing facilities depend on precise burner management to ensure safe ignition and fuel control. The PSR-PC50 can connect controller outputs to ignition circuits or solenoid valves, providing reliable switching and isolation. With the ability to handle up to 5 A, it ensures sufficient current for actuators while protecting the PLC outputs from overload. Its built-in diagnostics help confirm safe operation before each burner start, while the test pulse filter avoids false triggers. This combination enhances both process safety and energy efficiency, reducing the risk of unplanned shutdowns or costly repairs.

4. Safe Signal Coupling in Automated Manufacturing

Modern manufacturing lines rely on safety PLCs to control access barriers, interlocks, and alarm devices. The PSR-PC50 coupling relay provides the necessary power adaptation between the PLC outputs and field devices, ensuring stable performance under continuous operation. Its force-guided contacts allow for fault detection, giving maintenance teams early warning if a contact fails to open or close correctly. The compact 17.5 mm width saves valuable cabinet space, while the wide operating temperature range ensures consistent function in harsh factory environments. This makes the relay a dependable solution for automation systems that must balance efficiency with uncompromising safety.

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