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. 447-4540
Mfr. Part No.XPSDME1132
HK$3,856.21
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock 2 Preventa - - Screw - 114mm - 22.5mm 99mm
RS Stock No. 447-4499
Mfr. Part No.XPSAC3721
HK$1,262.86
Each
units
230 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 447-4477
Mfr. Part No.XPSAC5121
HK$1,867.04
Each
units
24 V ac/dc - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 731-8951
Mfr. Part No.XPSBCE3110P
HK$3,414.60
Each
units
24 V ac/dc - 1 Two-Hand Control 2 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 360-4346
Mfr. Part No.XPSAF5130
HK$2,038.58
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
HK$4,558.55
Each
units
24 V 1, 2 - Emergency Stop 3 Preventa - - - - 114mm - 99mm 45mm
RS Stock No. 422-5180
Mfr. Part No.XPSAK371144
HK$4,022.52
Each
units
230 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 609-7167
Mfr. Part No.XPSAFL5130
HK$2,681.35
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 464-495
Mfr. Part No.XPSATE3710P
HK$6,291.16
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. 447-4483
Mfr. Part No.XPSAC3421
HK$1,202.97
Each
units
115 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 201-1494
Mfr. Part No.XPSUEP14AP
HK$2,938.73
Each
units
24 V ac/dc 1 4 Emergency Stop Monitoring 5 Preventa - PLe Category 4, SIL CL3 Screw CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 22.5mm
RS Stock No. 200-6143
Mfr. Part No.XPSUS32AP
HK$4,864.85
Each
units
48 → 230 V ac/dc 2 - Emergency Stop 2 Preventa - PLe Category 4, SIL CL3 Screw CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 22.5mm
RS Stock No. 125-1104
Mfr. Part No.XPSVC1132P
HK$2,438.58
Each
units
24 V dc - - Safety Switch/Interlock - Preventa Manual PLe Category 4, SIL CL3 Screw BIA, CSA, DIN V VDE 801 + A1, EN/IEC 60204-1, EN/IEC 60947-1 + A1, EN/IEC 60947-5-1, UL 114mm - 22.5mm 99mm
RS Stock No. 201-1468
Mfr. Part No.XPSUAB31CC
HK$1,310.82
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. 125-1105
Mfr. Part No.XPSVNE3442HSP
HK$6,245.28
Each
units
- - - - - - - - Screw - 114mm - 45mm 99mm
RS Stock No. 812-3909
Mfr. Part No.XPSBAE3920P
HK$1,551.64
Each
units
115 → 230 V ac 2 1 Two-Hand Control 2 Preventa - - Screw - 99mm - 22.5mm 114mm
RS Stock No. 731-8957
Mfr. Part No.XPSBCE3110C
HK$3,313.36
Each
units
24 V ac/dc - 1 Two-Hand Control 2 Preventa - - Cage Clamp - 114mm - 111mm 22.5mm
RS Stock No. 125-1095
Mfr. Part No.XPSAK371144P
HK$3,316.58
Each
units
24 V dc, 230 V ac 2 - Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 1 Preventa Manual PLe Category 4, SIL CL3 Screw CSA, EN/IEC 60204-1, EN/IEC 60947-5-1, TUV, UL 114mm - 45mm 99mm
RS Stock No. 125-1100
Mfr. Part No.XPSPVK3484
HK$5,053.05
Each
units
24 V dc - - Emergency Stop, Safety Switch/Interlock 2 Preventa Manual PLe Category 4, SIL CL3 Screw CSA, TUV, UL - - - -
RS Stock No. 201-1466
Mfr. Part No.XPSUAT13A3AC
HK$3,289.01
Each
units
24 V ac/dc 1 8 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 45mm