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. 155-939
Mfr. Part No.750101
BrandPilz
€124.75
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock - - - 2 PNOZsigma Automatic, Manual - Screw - -
RS Stock No. 701-9212
Mfr. Part No.UE10-2FG2D0
BrandSick
€78.21
Each
units
24 V dc 1, 2 - Light Beam/Curtain - - - 3 - - - Screw - -
RS Stock No. 422-5152
Mfr. Part No.XPSAK311144
€211.30
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. 814-6930
Mfr. Part No.XPSAK311144P
€365.76
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. 239-1049
Mfr. Part No.774303
BrandPilz
€150.24
Each
units
24 V ac/dc 2 - Light Beam/Curtain, Safety Switch/Interlock - - - 2 PNOZ X Manual - Screw - -
RS Stock No. 245-1955
Mfr. Part No.774150
BrandPilz
€236.37
Each
units
24 V dc 2 1 Expansion Module - - - 8 PNOZ X - - Screw - -
RS Stock No. 890-3389
Mfr. Part No.G9SE-201-DC24
BrandOmron
€93.83
Each
units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 2 - Automatic, Manual - Screw CAN C22.2 No.14, CSA C22.2 No.14, EN 62061 SIL3, EN 81-1, EN 81-2, EN ISO 13849-1: 2008 PL e Safety Category 4, EN/IEC 60947-5-1, GB 14048.5, IEC 62061 SIL 3, UL508 -
RS Stock No. 918-6645
Mfr. Part No.777313
BrandPilz
€213.70
Each
units
24 240 V V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 3 PNOZ X Automatic, Manual - Screw - -
RS Stock No. 814-6927
Mfr. Part No.XPSAC5121P
€222.85
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock - - - 3 Preventa Monitored - Screw - -
RS Stock No. 239-1061
Mfr. Part No.774314
BrandPilz
€201.74
Each
units
24 V dc, 110 V ac 2 1 Safety Switch/Interlock - - - 3 PNOZ X Automatic, Monitored - Screw - -
RS Stock No. 447-5616
Mfr. Part No.440R-N23120
€140.40
Each
units
24 V ac/dc 2 - Light Beam/Curtain, Safety Switch/Interlock - - - 2 Minotaur Monitored - - - -
RS Stock No. 741-8650
Mfr. Part No.SRB 301MC-24V
BrandSchmersal
€223.00
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - - PROTECT - - Screw - -
RS Stock No. 447-5717
Mfr. Part No.440R-N23135
€198.90
Each
units
24 V ac/dc 1 1 Light Beam/Curtain, Safety Switch/Interlock - - - 3 Minotaur Monitored - Screw - -
RS Stock No. 245-1860
Mfr. Part No.774080
BrandPilz
€381.76
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock - - - 7 - Automatic, Manual, Monitored - Screw - -
RS Stock No. 447-5751
Mfr. Part No.440R-C23139
€313.30
Each
units
24 V ac/dc 2 2 Light Beam/Curtain, Safety Mat/Edge - - - 3 Minotaur Automatic, Manual, Monitored - Screw - -
RS Stock No. 156-083
Mfr. Part No.750103
BrandPilz
€152.90
Each
units
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 2 PNOZsigma Automatic, Manual, Monitored - Screw - -
RS Stock No. 362-0168
Mfr. Part No.774585
BrandPilz
€127.77
Each
units
24 V dc 1 - Expansion Module - - - 4 PNOZ X Automatic - Screw - -
RS Stock No. 751-1037
Mfr. Part No.440R-S13R2
€218.40
Each
units
24 V dc 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 3 E 3 - Automatic, Manual, Monitored - Screw - Yes
RS Stock No. 447-4584
Mfr. Part No.XPSVC1132
€245.14
Each
units
24 V dc - 2 - - - - 2 Preventa - - - - -
RS Stock No. 156-099
Mfr. Part No.750102
BrandPilz
€147.19
Each
units
24 V dc 1 1 Emergency Stop, Safety Switch/Interlock - - - 3 PNOZsigma Automatic, Manual, Monitored - Screw - -
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