Safety Relays

A safety relay is a device that monitors for potential errors or faults in machinery or plants and works to prevent injury and reduce risk. When an error occurs, the safety relay initiates a response to bring the risk back to a safe, acceptable level. Safety relays protect both machinery and employees, preventing potential expensive maintenance and equipment replacement.


Example functions include initiating a controlled pause in machinery or equipment to safely stop movement. They can also be used as an emergency stop mechanism, switching off the power to particular machinery or plants.


Single function or multi-function?


Safety relays can be single function or multi-function. Single function relays monitor a specific type of activity while multi-function safety relays can monitor different functions. Multi-function safety relays can be used in place of several single function, individual units.


The benefits of using multi-function relays include simpler installation and less wiring. As fewer individual units are needed, using multi-function relays can also free up panel space. Multi-function safety relays give you greater flexibility to make changes within the design or panel.


Where would you find a safety relay?


Safety relays are often found in the following control devices:


  • Two hand controls

  • Movable guards

  • Light curtains, light barriers and light grids

  • Magnetic switches

  • Safety mats and pressure sensitive mats

  • Three position devices

  • Non-contact safety sensors

  • Safety switches

  • Emergency stop buttons

Who uses them?


Anyone can integrate a safety relay within a circuit to create a safety circuit without any specific training.


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Viewing 1 - 11 of 11 products
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Description Price Supply Voltage Number of Channels Auxiliary Contacts Function Safety Contacts Range Reset Method Safety Category Terminal Type Standards Met Depth Hazardous Area Certification Length Width
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
£166.55
Each
Units
24 V dc 2 1 Emergency Stop 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 156-083
Mfr. Part No.750103
BrandPilz
£128.47
Each
Units
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 17.5mm
RS Stock No. 155-822
Mfr. Part No.750105
BrandPilz
£242.68
Each
Units
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 156-099
Mfr. Part No.750102
BrandPilz
£123.73
Each
Units
24 V dc 1 1 Emergency Stop, Safety Switch/Interlock 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 17.5mm
RS Stock No. 156-112
Mfr. Part No.750134
BrandPilz
£176.05
Each
Units
48 → 240 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 155-939
Mfr. Part No.750101
BrandPilz
£104.66
Each
Units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 2 PNOZsigma Automatic, Manual - Screw - 120mm - 100mm 12.5mm
RS Stock No. 155-850
Mfr. Part No.750126
BrandPilz
£166.55
Each
Units
24 V dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm
RS Stock No. 155-872
Mfr. Part No.750156
BrandPilz
£176.06
Each
Units
48 → 240 V ac/dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm
RS Stock No. 155-844
Mfr. Part No.750106
BrandPilz
£280.74
Each
Units
24 V dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm
RS Stock No. 155-838
Mfr. Part No.750135
BrandPilz
£252.18
Each
Units
48 → 240 V ac/dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 155-866
Mfr. Part No.750136
BrandPilz
£290.25
Each
Units
48 → 240 V ac/dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm