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 Category ISO 13849-1 SIL IEC 61508 PL ISO 13849-1 Safety Contacts Range Reset Method Safety Category Terminal Type Standards Met Configurable
RS stock no. 814-6927
Mfr. Part No.XPSAC5121P
R 3,726.07
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock - - - 3 Preventa Monitored - Screw - -
RS stock no. 447-4477
Mfr. Part No.XPSAC5121
R 2,635.85
Each
units
24 V ac/dc - 1 Emergency Stop - - - 3 Preventa - - Screw - -
RS stock no. 360-4346
Mfr. Part No.XPSAF5130
R 2,779.96
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock - - - 3 Preventa - - Screw - -
RS stock no. 464-491
Mfr. Part No.XPSATE5110P
R 6,851.32
Each
units
24 V dc 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock - - - 2 Preventa Automatic, Manual - Screw - -
RS stock no. 814-6915
Mfr. Part No.XPSAV11113P
R 4,939.40
Each
units
24 V dc 2 3 Emergency Stop, Safety Switch/Interlock - - - 6 Preventa Automatic, Monitored - Screw - -
RS stock no. 360-4352
Mfr. Part No.XPSAF5130P
R 3,118.64
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock - - - 3 Preventa - - Screw - -
RS stock no. 477-8684
Mfr. Part No.XPSCM1144
R 4,331.21
Each
units
24 V dc - 4 Light Beam/Curtain - - - 2 Preventa - - Screw - -
RS stock no. 464-495
Mfr. Part No.XPSATE3710P
R 7,081.31
Each
units
230 V ac 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock - - - 2 Preventa Automatic, Manual - Screw - -
RS stock no. 422-5152
Mfr. Part No.XPSAK311144
R 3,986.36
Each
units
24 V ac/dc 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - 3 Preventa Automatic, Manual - Screw - -
RS stock no. 422-5180
Mfr. Part No.XPSAK371144
R 3,993.35
Each
units
230 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - 3 Preventa Automatic, Manual - Screw - -
RS stock no. 731-8951
Mfr. Part No.XPSBCE3110P
R 4,982.52
Each
units
24 V ac/dc - 1 Two-Hand Control - - - 2 Preventa - - Screw - -
RS stock no. 814-6930
Mfr. Part No.XPSAK311144P
R 6,144.23
Each
units
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - 3 Preventa Monitored - Screw - -
RS stock no. 447-4461
Mfr. Part No.XPSMP11123
R 8,055.49
Each
units
24 V dc 1 3 Safety Mat/Edge, Safety Switch/Interlock - - - 6 Preventa Automatic, Monitored - - - -
RS stock no. 814-6921
Mfr. Part No.XPSAFL5130P
R 3,988.97
Each
units
24 V ac/dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 3 Preventa Monitored - Screw - -
RS stock no. 814-6952
Mfr. Part No.XPSAC3721P
R 4,986.50
Each
units
230 V ac 1 1 Emergency Stop, Safety Switch/Interlock - - - 3 Preventa Monitored - Screw - -
RS stock no. 447-4540
Mfr. Part No.XPSDME1132
R 5,339.74
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock - - - 2 Preventa - - Screw - -
RS stock no. 464-485
Mfr. Part No.XPS VNE1142P
R 6,306.00
Each
units
24 V dc 2 2 Speed/Standstill Monitoring - - - 2 Preventa - - Screw - -
RS stock no. 422-5203
Mfr. Part No.XPSAK351144P
R 4,455.66
Each
units
24 V dc, 120 V ac 1, 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - 3 Preventa - - Screw - -
RS stock no. 125-1107
Mfr. Part No.XPSVNE3742P
R 7,434.87
Each
units
230 V ac 2 2 Speed/Standstill Monitoring - - - 2 Preventa Manual PLd Category 3, SIL CL2 Screw CSA, EN/IEC 60204-1, EN/IEC 60947-5-1, TUV, UL -
RS stock no. 447-4483
Mfr. Part No.XPSAC3421
R 2,678.31
Each
units
115 V ac - 1 Emergency Stop - - - 3 Preventa - - Screw - -