Phoenix Contact PSR-MC20-3NO-1DO-24DC-SC Safety Relay

Phoenix Contact PSR-MC20-3NO-1DO-24DC-SC Safety Relay – Compact 24V DC Safety Control

The Phoenix Contact PSR-MC20-3NO-1DO-24DC-SC safety relay is a compact device built for safeguarding machinery through emergency stop and safety door monitoring. Measuring only 12.5 mm in width, it saves valuable panel space while delivering reliable performance up to SIL 3, Cat. 4, and PL e, depending on configuration. With three enabling paths and an additional digital output, it offers both manual and automatic restart functions. Its force-guided contacts, compliant with recognized safety standards, make it a dependable choice for engineers who need high safety levels in limited installation spaces.

The PSR-MC20-3NO-1DO-24DC-SC helps manufacturers maintain operational safety without adding unnecessary complexity. Its single-channel control design streamlines wiring and setup, reducing engineering time while ensuring secure shutdown when required. Fast reaction times of under 175 ms improve machine protection, while robust relay design supports long service life even under frequent operation. The device remains dependable in tough conditions, operating from -40 °C to +55 °C, and its flexible mounting options suit different panel layouts. This makes it ideal for applications such as conveyors, automated lines, and machine guarding systems where compact, high-performance safety control is essential.

Why Phoenix Contact PSR-MC20-3NO-1DO-24DC-SC?
The PSR-MC20-3NO-1DO-24DC-SC safety relay combines compact design with advanced safety performance, making it a trusted choice for modern industrial automation. With its 12.5 mm slim housing, three enabling circuits, and fast response time, it ensures reliable machine protection without consuming unnecessary space. Built for demanding environments, it simplifies wiring, reduces setup effort, and ensures compliance with global safety standards—delivering both efficiency and peace of mind.

What problem does it solve?
The PSR-MC20-3NO-1DO-24DC-SC addresses the critical need for dependable emergency stop and safety door monitoring in machinery. Without such a device, operators risk unsafe machine restarts or incomplete shutdowns. This relay provides immediate, reliable disconnection in hazardous events, safeguarding personnel while preventing costly equipment damage. By offering both manual and automatic restart modes, it adapts to diverse safety strategies, solving the challenge of balancing operator safety with operational efficiency.

Key Features & Specifications – Phoenix Contact PSR-MC20-3NO-1DO-24DC-SC: 2700466

Download PSR-MC20-3NO-1DO-24DC-SC 2700466 Datasheet

Commercial Information – Phoenix Contact PSR-MC20-3NO-1DO-24DC-SC: 2700466

The Applications of Phoenix Contact PSR-MC20-3NO-1DO-24DC-SC Safety Relay

1. Safety Mat Monitoring in Automated Cells

In automated production cells, safety mats are often used to detect human presence near moving machinery. When integrated with the PSR-MC20, the relay reliably processes the mat signal and ensures power is cut immediately if someone steps into the hazardous zone. With multiple enabling paths and internal checks, it prevents unsafe restarts and adds an extra layer of reliability compared to standard relays. This makes it ideal for environments where constant operator movement and rapid response are critical.

2. Guard Door Supervision in Packaging Systems

High-speed packaging machines typically use guard doors to restrict access during operation. The PSR-MC20 ensures these doors are continuously monitored and stops machine drives if they are opened. Its flexible reset modes—manual or automatic—prevent unintended machine restarts until safe conditions are restored. By combining compact size with dependable safety levels, it solves the challenge of maintaining both worker safety and machine uptime in fast-paced production environments.

3. Emergency Stop on Press Machines

Metal forming presses demand immediate shutdown when an emergency stop button is activated. The PSR-MC20 reacts within milliseconds, cutting drive power through its force-guided contacts. This ensures machinery cannot continue moving even if one contact fails. By enabling a reliable and repeatable shutdown, it protects operators from serious injury and prevents costly equipment damage. Its robust design also ensures long service life, even under the frequent emergency stops typical of press operations.

4. Light Curtain Protection in Robotic Welding Cells

Robotic welding stations often rely on light curtains to create virtual safety barriers. The PSR-MC20 processes these safety signals and ensures motion stops the moment the barrier is interrupted. Its redundant safety outputs guarantee shutdown even under wiring faults, while the digital output assists maintenance teams with quick fault detection. This combination of speed and diagnostic capability makes it highly effective in environments where precision and continuous operation are essential.

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