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 Function Safety Contacts Range Reset Method Safety Category Terminal Type Standards Met Depth Hazardous Area Certification Length Width
RS Stock No. 360-4346
Mfr. Part No.XPSAF5130
TWD6,591.00
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 477-3847
Mfr. Part No.XPSAV11113
TWD16,060.00
Each
units
24 V 1, 2 - Emergency Stop 3 Preventa - - - - 114mm - 99mm 45mm
RS Stock No. 609-7167
Mfr. Part No.XPSAFL5130
TWD9,447.00
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 360-4352
Mfr. Part No.XPSAF5130P
TWD8,539.00
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 447-4534
Mfr. Part No.XPSDMB1132
TWD7,364.00
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock 2 Preventa - 4 Screw - 114mm - 22.5mm 99mm
RS Stock No. 464-491
Mfr. Part No.XPSATE5110P
TWD19,172.00
Each
units
24 V dc 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 2 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 447-4540
Mfr. Part No.XPSDME1132
TWD8,918.00
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock 2 Preventa - - Screw - 114mm - 22.5mm 99mm
RS Stock No. 447-4461
Mfr. Part No.XPSMP11123
TWD22,567.00
Each
units
24 V dc 1 3 Safety Mat/Edge, Safety Switch/Interlock 6 Preventa Automatic, Monitored - - - 114mm - 99mm 45mm
RS Stock No. 201-1496
Mfr. Part No.XPSUAF13AC
TWD6,957.00
Each
units
24 V ac/dc 1 4 Emergency Stop 5 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. 814-6949
Mfr. Part No.XPSDME1132P
TWD13,403.00
Each
units
24 V dc 1 2 Safety Switch/Interlock 2 Preventa Monitored - Screw - 114mm - 99mm 45mm
RS Stock No. 200-6176
Mfr. Part No.XPSUAB11CP
TWD5,459.00
Each
units
24 V 1 - Emergency Stop 1 Preventa - PLc Category 1, SIL CL1 Screw CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 22.5mm
RS Stock No. 731-8951
Mfr. Part No.XPSBCE3110P
TWD12,030.00
Each
units
24 V ac/dc - 1 Two-Hand Control 2 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 125-1098
Mfr. Part No.XPSMP11123P
TWD17,870.00
Each
units
24 V dc 2 - Emergency Stop, Safety Switch/Interlock 3 Preventa Manual PLe Category 4, SIL 3 Screw BIA, CSA, DIN V VDE 801 + A1, EN/IEC 60204-1, EN/IEC 60947-1 + A1, EN/IEC 60947-5-1, UL 114mm - 45mm 99mm
RS Stock No. 201-1471
Mfr. Part No.XPSUAB11CC
TWD4,653.00
Each
units
24 V ac/dc 1 8 Emergency Stop 2 Preventa - PLc Category 1, SIL CL1 Spring CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 22.5mm
RS Stock No. 447-4483
Mfr. Part No.XPSAC3421
TWD5,466.00
Each
units
115 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 201-1468
Mfr. Part No.XPSUAB31CC
TWD5,150.00
Each
units
48-230 V ac/dc 1 8 Emergency Stop Monitoring 2 Preventa - PLc Category 1, SIL CL1 Spring CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 22.5mm
RS Stock No. 477-8684
Mfr. Part No.XPSCM1144
TWD11,426.00
Each
units
24 V dc - 4 Light Beam/Curtain 2 Preventa - - Screw - - - - -
RS Stock No. 464-495
Mfr. Part No.XPSATE3710P
TWD24,432.00
Each
units
230 V ac 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 2 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 201-1497
Mfr. Part No.XPSUEP34AC
TWD6,777.00
Each
units
24 V ac/dc 1 4 Emergency Stop Monitoring 5 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. 481-8237
Mfr. Part No.XPSAK351144
TWD11,645.00
Each
units
120 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm