Sensor-free over-speed safety relays

Safe motion monitoring without additional sensors

Whether for driverless transport systems or rotating axes in machine tools: the PSR-MM35 safe over-speed safety relay reliably monitors speeds and thus provides protection against dangerous movements. You can monitor movements particularly cost-effectively and efficiently entirely without additional sensors.

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Sensor-free motion monitoring
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Sensor-free PSR-MM35 over-speed safety relay

Sensor-free PSR-MM35 over-speed safety relay

The TÜV-certified, safe PSR-MM35 over-speed safety relay monitors speeds without additional sensors. Based on the rotary field measurement of the drive, the integrated safety functions are reliably implemented up to SIL 3 or PLe.

Integrated safety functions:

  • STO (Safe Torque Off)
  • SLS (Safely Limited Speed)
  • SSM (Safe Speed Monitor)
  • SSR (Safe Speed Range)
Packaging machine

Use in the food industry using the example of a packaging machine

Very cost-effective

Sensor-free technology eliminates the costs for additional sensors for speed monitoring. Save up to 50% of your procurement costs.

Measurement of the drive rotary field

Measurement of the drive rotary field enables sensor-free motion monitoring

Maximum reliability

External sensors are susceptible to interference from environmental influences such as shock, vibration, and EMC. The rotary field measurement of the drive is independent of disruptive factors, allowing maximum availability of the system to be achieved.

Safety functions for safe motion monitoring

Integrated safety functions for safe motion monitoring

Fast commissioning

Without additional sensors, there is no need for further assembly and adjustment work. The intuitive PSRmotion configuration software further reduces the installation and commissioning time of the over-speed safety relay.

Possible applications Sensor-free over-speed safety relays in use

CNC milling machine
Machine tool example: CNC milling machine
CNC drill
Machine tool example: CNC drill
Woodworking machine
Machine tool example: woodworking machine
Machine building example: packaging machine
Machine building example: packaging machine
Power-operated bridge in Amsterdam
Infrastructure example: power-operated bridge

Product overview Sensor-free PSR-MM35 over-speed safety relay

Versions at a glance

PSR-MM35-1NO-1DO-24DC-SP
PSR-MM35-1NO-1DO-24DC-SC
PSR-MM35-1NO-1DO-24DC-SP

Sensor-free PSR-MM35 over-speed safety relay with Push-in connection

 PSR-MM35-1NO-1DO-24DC-SC

Sensor-free PSR-MM35 over-speed safety relay with screw connection
Safety level up to SIL 3 / PL e up to SIL 3 / PL e
Evaluation 2-channel evaluation of the rotating field of AC and three-phase motors 2-channel evaluation of the rotating field of AC and three-phase motors
Overall width 12.5 mm 12.5 mm
Configuration software PSRmotion PSRmotion
Connection method plug-in Push-in terminal block plug-in screw terminal block
To the product To the product

Further information

Over-speed and zero-speed safety relays
Over-speed and zero-speed safety relays
Compact safety relays for over-speed and zero-speed monitoring.
More about over-speed and zero-speed safety relays
Production line with functional safety
Functional safety
Discover our TÜV-certified solutions for the safety of your machinery and systems.
Solutions for functional safety