Safety Relays

What are they?
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 Safety Contacts Function Reset Method Range Safety Category Terminal Type Standards Met Depth Hazardous Area Certification Length Width
RS Stock No. 733-2351
Mfr. Part No.2TLA010026R0500 RT6 230AC
BrandABB
TWD13,088.00
Each
units
230 V ac 1, 2 - 4 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - Terminal Block - 120mm - 84mm 45mm
RS Stock No. 784-5780
Mfr. Part No.3SK1111-1AB30
BrandSiemens
TWD10,060.00
Each
units
24 V ac/dc 1 - 4 - Automatic, Monitored SIRIUS - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 757-9310
Mfr. Part No.G9SA-321-T075 AC/DC24
BrandOmron
TWD12,307.00
Each
units
24 V ac/dc 2 1 3 Emergency Stop - - - - - 111mm - 94mm 45mm
RS Stock No. 201-1464
Mfr. Part No.XPSUAF33AC
TWD7,269.00
Each
units
48 → 230 V ac/dc 1 4 5 Emergency Stop - Preventa PLe Category 4, SIL CL3 Spring CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 22.5mm
RS Stock No. 814-6927
Mfr. Part No.XPSAC5121P
TWD14,957.00
Each
units
24 V ac/dc 1 1 3 Emergency Stop, Safety Switch/Interlock Monitored Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 198-582
Mfr. Part No.XPSAR351144P
TWD26,261.00
Each
units
115 V ac 2 2 7 Emergency Stop, Light Beam/Curtain Automatic, Manual Preventa - Screw - 114mm - 99mm 90mm
RS Stock No. 206-5906
Mfr. Part No.103014754
TWD13,179.00
Each
units
24 V 2 2 2 Time Delay - - - - - - - - -
RS Stock No. 177-4036
Mfr. Part No.2700575
TWD6,874.00
Each
units
24 V dc 2 - 2 Two Hand Control Manual - 1 Terminal Block - 114.5mm - 116.6mm 12.5mm
New
RS Stock No. 219-9216
Mfr. Part No.XPSATR1153C
TWD17,854.00
Each
units
230 V - - - - - - - - - - - - -
RS Stock No. 191-9871
Mfr. Part No.751184
BrandPilz
TWD9,774.00
Each
units
24 V dc 2 1 3 - Automatic, Manual PNOZ s5 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 814-6930
Mfr. Part No.XPSAK311144P
TWD14,140.00
Each
units
24 V ac/dc 2 1 3 Emergency Stop, Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock Monitored Preventa - Screw - 114mm - 99mm 45mm
RS Stock No. 477-8684
Mfr. Part No.XPSCM1144
TWD12,117.00
Each
units
24 V dc - 4 2 Light Beam/Curtain - Preventa - Screw - - - - -
RS Stock No. 176-0031
Mfr. Part No.2TLA010051R0000 Sentry SSR20 24VDC
BrandABB Jokab
TWD6,784.00
Each
units
24 V dc - 3NO/NC 4 Safety Switch Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 201-1466
Mfr. Part No.XPSUAT13A3AC
TWD12,742.00
Each
units
24 V ac/dc 1 8 5 Emergency Stop - Preventa PLe Category 4, SIL CL3 Spring CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 45mm
RS Stock No. 201-5299
Mfr. Part No.1009832
TWD8,114.00
Each
units
24 V dc 2 None 2 Emergency Stop - - - - - - - - -
RS Stock No. 201-1474
Mfr. Part No.XPSUDN33AC
TWD10,860.00
Each
units
24 V ac/dc 1 4 5 Emergency Stop - Preventa PLe Category 4, SIL CL3 Spring CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 45mm
RS Stock No. 177-4033
Mfr. Part No.2702192
TWD3,845.00
Each
units
24 V dc 1 - 1 - Manual - 1 Terminal Block - 102.5mm - 93.1mm 6.8mm
RS Stock No. 146-5865
Mfr. Part No.SRB-E-204PE
BrandSchmersal
TWD6,162.00
Each
units
24 V dc 1, 2 - - - Automatic - - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 422-5152
Mfr. Part No.XPSAK311144
TWD11,543.00
Each
units
24 V ac/dc 2 1 3 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock Automatic, Manual Preventa - Screw - 114mm - 99mm 45mm
RS Stock No. 549-473
Mfr. Part No.G9SB-200-B AC/DC24
BrandOmron
TWD5,130.00
Each
units
24 V ac/dc 2 - 2 Emergency Stop Automatic - - - - 112mm - 100mm 18mm