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 Series
RS Stock No. 245-1905
Mfr. Part No.774500
BrandPilz
SGD542.86
Each
units
24 V dc 2 - Safety Switch/Interlock 2 PNOZ X Automatic, Manual, Monitored - Screw - 121mm - 87mm -
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
SGD348.43
Each
units
24 V dc 2 1 Emergency Stop 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm -
RS Stock No. 712-5263
Mfr. Part No.2986575
SGD247.49
Each
units
24 V dc - - - 3 - - - Screw - 114.5mm - 99mm -
RS Stock No. 245-1848
Mfr. Part No.774310
BrandPilz
SGD364.07
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm -
RS Stock No. 239-1055
Mfr. Part No.774306
BrandPilz
SGD271.42
Each
units
24 V ac/dc 2 - Safety Switch/Interlock 2 PNOZ X Automatic, Manual - Screw - 121mm - 87mm -
RS Stock No. 239-1033
Mfr. Part No.774300
BrandPilz
SGD269.28
Each
units
24 V ac/dc 1 1 Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 87mm -
RS Stock No. 360-4346
Mfr. Part No.XPSAF5130
SGD310.70
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 Preventa - - Screw - 114mm - 99mm -
RS Stock No. 245-1854
Mfr. Part No.774318
BrandPilz
SGD364.07
Each
units
24 V dc, 230 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm -
RS Stock No. 712-5260
Mfr. Part No.2986960
SGD246.90
Each
units
24 V dc - - - 3 - - 3 Screw - 114.5mm - 99mm -
RS Stock No. 666-7022
Mfr. Part No.2981020
SGD159.49
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 3 - - - Screw - 114.5mm - 99mm -
RS Stock No. 122-2500
Mfr. Part No.R1.188.0720.2
BrandWieland
SGD215.60
Each
units
24 V ac/dc 2 1 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 SafeRELAY Monitored - Screw CCC, CPT, CULus, DGUV, EN 62061, EN ISO 13849-1, GOST R 96.5mm - 22.5mm -
RS Stock No. 701-9212
Mfr. Part No.UE10-2FG2D0
BrandSick
SGD113.00
Each
units
24 V dc 1, 2 - Light Beam/Curtain 3 - - - Screw - 70.8mm - 89.8mm -
RS Stock No. 666-7040
Mfr. Part No.2963763
SGD184.18
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 3 - - 3 Screw - 114.5mm - 99mm -
RS Stock No. 321-9049
Mfr. Part No.SNO 4062K-A-00C
BrandWieland
SGD180.29
Each
units
24 V ac/dc 2 1 Emergency Stop 2 SafeRELAY - - Screw - 114mm - 96.5mm -
RS Stock No. 362-0168
Mfr. Part No.774585
BrandPilz
SGD230.56
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X Automatic - Screw - 121mm - 87mm -
RS Stock No. 155-939
Mfr. Part No.750101
BrandPilz
SGD210.59
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 2 PNOZsigma Automatic, Manual - Screw - 120mm - 100mm -
RS Stock No. 324-7274
Mfr. Part No.774059
BrandPilz
SGD223.21
Each
units
24 V ac/dc 1 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 812-8976
Mfr. Part No.ESR5-NV3-30
BrandEaton
SGD582.31
Each
units
- 2 - Emergency Stop, Safety Switch/Interlock 2 - Automatic, Manual - Screw - 99mm - 22.5mm -
RS Stock No. 666-7047
Mfr. Part No.2963750
SGD176.95
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 2 - - 3 Screw - 114.5mm - 99mm -
RS Stock No. 712-5266
Mfr. Part No.2986588
SGD247.49
Each
units
24 V dc - - - 3 - - 2 Screw - 114.5mm - 112mm -
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