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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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. 890-3382
Mfr. Part No.G9SE-401-DC24
BrandOmron
£97.80
Each
Units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 - 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 22.5mm
RS Stock No. 360-4352
Mfr. Part No.XPSAF5130P
£168.00
Each
Units
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 291-3201
Mfr. Part No.BG5924.48 AC/DC24V
BrandDold
£166.31
Each
Units
24 V dc 1 - Emergency Stop 4 Safemaster - - - - 121mm - 84mm 22.5mm
RS Stock No. 240-8743
Mfr. Part No.BD5987.02/001 AC50/60Hz 230V
BrandDold
£227.54
Each
Units
230 V ac 2 - Emergency Stop 2 Safemaster - - - - 121mm - 74mm 45mm
RS Stock No. 489-6388
Mfr. Part No.777606
BrandPilz
£366.60
Each
Units
24 → 240 V ac/dc 1, 2 2 Safety Switch/Interlock 7 PNOZ X - - Screw - 121mm - 94mm 90mm
RS Stock No. 918-6645
Mfr. Part No.777313
BrandPilz
£203.41
Each
Units
24 → 240 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm 45mm
RS Stock No. 447-4607
Mfr. Part No.XPSBF1132
£255.00
Each
Units
24 V dc - 2 Two-Hand Control 2 Preventa - - - - 114mm - 99mm 22.5mm
RS Stock No. 324-7268
Mfr. Part No.774056
BrandPilz
£108.12
Each
Units
230 V ac 1 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 327-7629
Mfr. Part No.BG5925.22 AC/DC24V
BrandDold
£178.82
Each
Units
24 V ac/dc 1, 2 - Emergency Stop 3 Safemaster - - - - 118mm - 84mm 22.5mm
RS Stock No. 382-2055
Mfr. Part No.011-160
BrandSmartscan
£209.65
Each
Units
24 V dc 2 - Light Beam/Curtain 2 - Automatic - - - 60mm - 90mm 70mm
RS Stock No. 382-2049
Mfr. Part No.011-149
BrandSmartscan
£94.84
Each
Units
24 V dc 2 1 Light Beam/Curtain 2 - Automatic, Manual - - - 60mm - 90mm 70mm
RS Stock No. 784-5800
Mfr. Part No.3SK1121-1AB40
BrandSiemens
£143.01
Each
Units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 666-7044
Mfr. Part No.2963802
£104.59
Each
Units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock 4 - - 1 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 812-8976
Mfr. Part No.118705 & ESR5-NV3-30
BrandEaton
£302.06
Each
Units
- 2 - Emergency Stop, Safety Switch/Interlock 2 - Automatic, Manual - Screw - 99mm - 22.5mm 114.5mm
RS Stock No. 515-1759
Mfr. Part No.R1.188.0500.1
BrandWieland
£102.73
Each
Units
24 V ac/dc 2 1 Safety Switch/Interlock 3 safeRELAY Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 477-8684
Mfr. Part No.XPSCM1144
£233.00
Each
Units
24 V dc - 4 Light Beam/Curtain 2 Preventa - - Screw - - - - -
RS Stock No. 918-6686
Mfr. Part No.777301
BrandPilz
£161.53
Each
Units
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm 22.5mm
RS Stock No. 733-2436
Mfr. Part No.2TLA020052R1000
BrandABB
£245.35
Each
Units
24 V dc - - Light Beam/Curtain, Safety Switch/Interlock 2 - Automatic, Manual - Screw - 120mm - 22.5mm 84mm
RS Stock No. 422-5168
Mfr. Part No.XPSAK361144
£216.00
Each
Units
110 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 447-5672
Mfr. Part No.440R-N23131
£174.00
Each
Units
115 V ac 1 1 Light Beam/Curtain, Safety Switch/Interlock 3 Minotaur Automatic, Manual - Screw - 22.5mm - 114.5mm 99mm