$ 546.48
Phoenix Contact PSR-MM25-1NO-2DO-24DC-SC safety relay offers zero-speed monitoring, SIL 3 safety compliance, and a compact 12.5 mm housing.
The Phoenix Contact PSR-MM25-1NO-2DO-24DC-SC safety relay is a compact solution for monitoring the standstill condition of single-phase and three-phase motors without requiring additional sensors. Built for safety levels up to SIL 3, Category 3, and Performance Level e, it ensures reliable shutdown by evaluating residual motor voltage. With a slim 12.5 mm housing, adjustable delay times, and configurable switching thresholds, it supports space-saving installation while delivering dependable protection. This makes it an essential choice for industries where accurate motor stop detection and compliance with high safety requirements are critical.
The PSR-MM25 safety relay offers both flexibility and reliability, combining a small footprint with advanced safety features. It includes one enabling current path and two digital signal outputs, allowing smooth integration into automation environments. The sensor-free design lowers installation complexity and reduces ongoing maintenance efforts, while robust insulation up to several kilovolts strengthens overall system protection. Adjustable parameters give engineers the freedom to adapt the device for a wide range of motor applications. By preventing unintentional motion, it safeguards operators, extends machinery life, and ensures adherence to international functional safety standards, making it ideal for modern industrial systems.
The Phoenix Contact PSR-MM25-1NO-2DO-24DC-SC stands out as a safety relay that delivers precision zero-speed monitoring without requiring additional sensors. Its compact design, combined with adjustable thresholds and timing, ensures both space efficiency and adaptability. By supporting up to SIL 3 and Performance Level e, it gives engineers the confidence to integrate high-level safety into demanding industrial systems while minimizing wiring effort and maintenance costs.
Unexpected motor movement can endanger workers and damage equipment. The PSR-MM25 safety relay eliminates this risk by detecting when motors have fully stopped, providing a reliable safeguard during maintenance or production stops. It solves the challenge of achieving secure motor standstill monitoring without external sensors, cutting installation complexity while ensuring compliance with global safety standards. This makes it a vital component in machine safety strategies across automation and manufacturing environments.
| Feature | Details | Benefit |
|---|---|---|
| Function | Zero-speed safety relay | Monitors safe motor stop conditions |
| Input Voltage | 20.4 V DC … 26.4 V DC (nominal 24 V DC) | Compatible with common control supply |
| Inputs | 3 inputs (L1, L2, L3) | Allows monitoring of AC and DC motors |
| Outputs | 1 enabling safety contact, 2 PNP digital outputs | Flexible signaling for control integration |
| Switching Threshold | Adjustable from 50 mV to 500 mV | Tailored sensitivity for different applications |
| Delay Time | Adjustable 0.5 s to 20 s | Adaptable response to application needs |
| Response Time | ~20 ms (at 50 Hz) | Fast reaction for enhanced safety |
| Housing Width | 12.5 mm | Saves space in compact control cabinets |
| Safety Category | Cat. 3 / PL e (EN ISO 13849-1), SIL 3 (EN IEC 62061, IEC 61508) | Highest level of certified safety |
| Mounting | DIN rail, vertical or horizontal | Easy installation with flexible orientation |
| Environmental Rating | Operating temperature -20 °C to +55 °C, IP20 | Reliable in industrial conditions |
| Service Life | 10 million mechanical cycles | Long-lasting reliability in demanding use |
| Approvals | CE, UL, cUL, Functional Safety | Meets global compliance requirements |
Download PSR-MM25-1NO-2DO-24DC-SC 2702355 Datasheet
| Commercial Attribute | Value |
|---|---|
| GTIN Number | 4055626133201 |
| Tariff Number | 90328900 |
| Weight | 150 g (including packing) / 152.5 g (net) |
| Country of Origin | Germany (DE) |
In warehouses and bulk processing facilities, conveyor belts must come to a complete stop before operators can safely approach. The PSR-MM25 relay ensures zero-speed detection by evaluating the motor’s residual voltage without needing extra sensors. Its configurable switching threshold and delay help avoid false signals caused by coasting or short electrical dips. Once standstill is verified, safety interlocks can release, allowing staff to access the system confidently. This prevents entanglement hazards, reduces downtime for maintenance, and supports compliance with modern safety regulations in high-volume handling operations.
Automated machines often have protective doors or covers that must remain locked until internal parts stop moving. The PSR-MM25 plays a key role by confirming motor standstill before doors can unlock. Adjustable time delays prevent premature release while components are still decelerating. By eliminating the need for shaft-mounted sensors, the relay simplifies system design and reduces potential failure points. This approach protects operators from exposure to rotating parts, minimizes wiring complexity, and fits easily into compact panels due to its narrow 12.5 mm housing.
In industries where rolls and webs are processed, ensuring rollers stop fully before adjustments is critical to safety and product quality. The PSR-MM25 detects zero speed through residual voltage monitoring, providing a reliable confirmation that heavy rollers are no longer moving. Engineers can fine-tune the threshold to suit different motor types and process speeds, avoiding unnecessary interruptions. Once standstill is validated, operators can safely carry out threading, inspection, or maintenance. This prevents material tears, avoids machine damage, and supports smooth workflow in continuous production environments.
In machining centers, tool changes or workpiece loading must only occur when spindles are fully at rest. The PSR-MM25 integrates into safety circuits to ensure that brakes or interlocks release only after zero speed is confirmed. With its SIL 3 and PL e certifications, it offers dependable protection in demanding environments. Its compact footprint allows easy integration into crowded control cabinets, while fast response times reduce waiting periods for operators. By verifying true standstill before mechanical intervention, the relay safeguards personnel, prevents tool breakage, and extends equipment lifespan.
| Category | Model | Part Number | Benefit |
|---|---|---|---|
| Accessory | C-RCI 2,5/M4 | 3240023 | Secure cable connection with reliable termination |
| C-RCI 2,5/M6 | 3240025 | Easy integration with M6 terminal connections | |
| C-RCI 2,5/M8 | 3240026 | Durable lug for larger stud sizes | |
| C-RC 2,5/M3,5 DIN | 3240077 | Cost-effective solution for smaller terminations | |
| C-RC 2,5/M5 DIN | 3240079 | Reliable connection for M5 studs | |
| C-RC 2,5/M6 DIN | 3240080 | Compact and robust connection option | |
| C-RC 2,5/M8 DIN | 3240081 | Designed for industrial durability | |
| C-RC 2,5/M10 DIN | 3240082 | Strong termination for heavy-duty use | |
| Tool | CRIMPFOX 6 | 1212034 | Professional crimping tool ensuring secure connections |
For expert guidance before placing your order.
Warranty – 1-year warranty for your peace of mind.
Global Shipping – We ship worldwide with secure packaging and reliable delivery.
Technical Support – Contact us for professional after-sales technical assistance.
