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 21 - 40 of 464 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. 751-1033
Mfr. Part No.440R-S12R2
£150.00
Each
Units
24 V dc 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 2 - Automatic, Manual, Monitored - Screw - 119.4mm - 113.6mm 22.5mm
RS Stock No. 447-5717
Mfr. Part No.440R-N23135
£153.00
Each
Units
24 V ac/dc 1 1 Light Beam/Curtain, Safety Switch/Interlock 3 Minotaur Monitored - Screw - 22.5mm - 114.5mm 99mm
RS Stock No. 239-1061
Mfr. Part No.774314
BrandPilz
£174.02
Each
Units
24 V dc, 110 V ac 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 447-5650
Mfr. Part No.440R-N23130
£182.00
Each
Units
230 V ac 1 1 Light Beam/Curtain, Safety Switch/Interlock 3 Minotaur Automatic, Manual - Screw - 22.5mm - 114.5mm 99mm
RS Stock No. 751-1024
Mfr. Part No.440R-D22R2
£268.00
Each
Units
24 V dc 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 2 Guardmaster Automatic, Manual, Monitored - Screw - 119.4mm - 113.6mm 22.5mm
RS Stock No. 378-5366
Mfr. Part No.774315
BrandPilz
£174.02
Each
Units
24 V dc, 115 V ac 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 203-8035
Mfr. Part No.774073
BrandPilz
£179.91
Each
Units
24 V dc, 110 V ac 2 - Safety Switch/Interlock 2 - Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 193-0520
Mfr. Part No.440R-B23020
£160.00
Each
Units
24 V ac/dc 1 1 Safety Switch/Interlock 3 Minotaur Automatic, Manual, Monitored - Screw - 22.5mm - 99mm 75mm
RS Stock No. 321-9049
Mfr. Part No.SNO 4062K-A-00C
BrandWieland
£111.67
Each
Units
24 V ac/dc 2 1 Emergency Stop 2 safeRELAY - - Screw - 114mm - 96.5mm 22.5mm
RS Stock No. 751-1037
Mfr. Part No.440R-S13R2
£168.00
Each
Units
24 V dc 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 - Automatic, Manual, Monitored - Screw - 119.4mm - 113.6mm 22.5mm
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. 489-6394
Mfr. Part No.777949
BrandPilz
£386.15
Each
Units
24 → 240 V ac/dc 1, 2 1 Speed/Standstill Monitoring 2 PNOZ X - - Screw - 121mm - 94mm 45mm
RS Stock No. 741-8650
Mfr. Part No.SRB 301MC-24V
BrandSchmersal
£187.29
Each
Units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm
RS Stock No. 447-4483
Mfr. Part No.XPSAC3421
£144.00
Each
Units
115 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 784-5780
Mfr. Part No.3SK1111-1AB30
BrandSiemens
£109.44
Each
Units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 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. 245-1955
Mfr. Part No.774150
BrandPilz
£221.86
Each
Units
24 V dc 2 1 Expansion Module 8 PNOZ X - - Screw - 121mm - 87mm 90mm
RS Stock No. 609-7167
Mfr. Part No.XPSAFL5130
£155.00
Each
Units
24 V ac/dc 1, 2 - Light Beam/Curtain 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 890-3389
Mfr. Part No.G9SE-201-DC24
BrandOmron
£78.85
Each
Units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 - Automatic, Manual - Screw CAN C22.2 No.14, CSA C22.2 No.14, EN 62061 SIL3, EN 81-1, EN 81-2, EN ISO 13849-1: 2008 PL e Safety Category 4, EN/IEC 60947-5-1, GB 14048.5, IEC 62061 SIL 3, UL508 111.6mm - 144.5mm 17.5mm
RS Stock No. 464-491
Mfr. Part No.XPSATE5110P
£370.00
Each
Units
24 V dc 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 2 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
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