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 Safety Contacts Function Auxiliary Contacts Reset Method Range Safety Category Terminal Type Standards Met Depth Hazardous Area Certification Length Width
RS Stock No. 245-1905
Mfr. Part No.774500
BrandPilz
SGD608.10
Each
units
24 V dc 2 2 Safety Switch/Interlock - Automatic, Manual, Monitored PNOZ X - Screw - 121mm - 87mm 45mm
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
SGD625.14
Each
units
24 V dc 2 3 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 1 Automatic, Manual, Monitored PNOZsigma - Screw - 120mm - 102mm 22.5mm
RS Stock No. 712-5263
Mfr. Part No.2986575
SGD280.53
Each
units
24 V dc - 3 - - - - - Screw - 114.5mm - 99mm 17.5mm
RS Stock No. 245-1848
Mfr. Part No.774310
BrandPilz
SGD429.53
Each
units
24 V ac/dc 2 3 Safety Switch/Interlock 1 Automatic, Monitored PNOZ X - Screw - 121mm - 87mm 45mm
RS Stock No. 239-1055
Mfr. Part No.774306
BrandPilz
SGD309.43
Each
units
24 V ac/dc 2 2 Safety Switch/Interlock - Automatic, Manual PNOZ X - Screw - 121mm - 87mm 22.5mm
RS Stock No. 239-1033
Mfr. Part No.774300
BrandPilz
SGD301.62
Each
units
24 V ac/dc 1 3 Safety Switch/Interlock 1 Automatic, Manual PNOZ X - Screw - 121mm - 87mm 22.5mm
RS Stock No. 360-4346
Mfr. Part No.XPSAF5130
SGD324.03
Each
units
24 V ac/dc 1, 2 3 Safety Switch/Interlock - - Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 712-5260
Mfr. Part No.2986960
SGD336.37
Each
units
24 V dc - 3 - - - - 3 Screw - 114.5mm - 99mm 17.5mm
RS Stock No. 245-1854
Mfr. Part No.774318
BrandPilz
SGD426.41
Each
units
24 V dc, 230 V ac 2 3 Emergency Stop 1 Automatic, Monitored PNOZ X - Screw - 121mm - 87mm 45mm
RS Stock No. 666-7022
Mfr. Part No.2981020
SGD444.32
Each
units
24 V dc 1 3 Emergency Stop, Safety Switch/Interlock - - - - Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 122-2500
Mfr. Part No.R1.188.0720.2
BrandWieland
SGD286.60
Each
units
24 V ac/dc 2 2 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 1 Monitored safeRELAY - Screw CCC, CPT, cULus, DGUV, EN 62061, EN ISO 13849-1, GOST R 96.5mm - 22.5mm 114mm
RS Stock No. 666-7040
Mfr. Part No.2963763
SGD332.40
Each
units
24 V ac/dc 2 3 Emergency Stop, Safety Switch/Interlock 1 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 321-9049
Mfr. Part No.SNO 4062K-A-00C
BrandWieland
SGD242.40
Each
units
24 V ac/dc 2 2 Emergency Stop 1 - safeRELAY - Screw - 114mm - 96.5mm 22.5mm
RS Stock No. 362-0168
Mfr. Part No.774585
BrandPilz
SGD264.96
Each
units
24 V dc 1 4 Expansion Module - Automatic PNOZ X - Screw - 121mm - 87mm 22.5mm
RS Stock No. 324-7274
Mfr. Part No.774059
BrandPilz
SGD257.98
Each
units
24 V ac/dc 1 2 Safety Switch/Interlock - Automatic, Manual PNOZ X PLe Category 4 Screw - 121mm - 87mm 22.5mm
RS Stock No. 812-8976
Mfr. Part No.118705 & ESR5-NV3-30
BrandEaton
SGD578.66
Each
units
- 2 2 Emergency Stop, Safety Switch/Interlock - Automatic, Manual - - Screw - 99mm - 22.5mm 114.5mm
RS Stock No. 666-7047
Mfr. Part No.2963750
SGD444.32
Each
units
24 V ac/dc 2 2 Emergency Stop, Safety Switch/Interlock 1 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 155-939
Mfr. Part No.750101
BrandPilz
SGD262.24
Each
units
24 V dc 1 2 Emergency Stop, Safety Switch/Interlock - Automatic, Manual PNOZsigma PLc Category 1, SIL CL2 Screw - 120mm - 100mm 12.5mm
RS Stock No. 712-5266
Mfr. Part No.2986588
SGD194.11
Each
units
24 V dc - 3 - - - - 2 Screw - 114.5mm - 112mm 17.5mm
RS Stock No. 741-8666
Mfr. Part No.SRB324ST 24V (V.3)
BrandSchmersal
SGD842.83
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Switch/Interlock - - PROTECT - Screw - 121mm - 100mm 45mm