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. 422-5168
Mfr. Part No.XPSAK361144
£210.00
Each
Units
110 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 447-5672
Mfr. Part No.440R-N23131
£174.00
Each
Units
115 V ac 1 1 Light Beam/Curtain, Safety Switch/Interlock 3 Minotaur Automatic, Manual - Screw - 22.5mm - 114.5mm 99mm
RS Stock No. 240-8692
Mfr. Part No.BD5935.48 DC24V
BrandDold
£235.50
Each
Units
24 V dc 1, 2 - Emergency Stop 4 Safemaster - - Screw - 121mm - 74mm 45mm
RS Stock No. 250-6459
Mfr. Part No.440R-F23027
£349.00
Each
Units
24 V ac/dc 2 1 Safety Switch/Interlock 2 Minotaur Automatic, Manual - - - 32mm - 75mm 52mm
RS Stock No. 515-1787
Mfr. Part No.R1.188.0530.1
BrandWieland
£125.94
Each
Units
24 V ac/dc 2 1 Two-Hand Control 2 safeRELAY Monitored - Screw - 114mm - 96.5mm 22.5mm
RS Stock No. 481-8237
Mfr. Part No.XPSAK351144
£210.00
Each
Units
120 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 549-609
Mfr. Part No.G9SA-301 24AC/DC
BrandOmron
£168.10
Each
Units
24 V ac/dc 1, 2 1 Emergency Stop 3 - - - - - 111mm - 76mm 45mm
RS Stock No. 741-8641
Mfr. Part No.SRB301AN 24VAC/DC
BrandSchmersal
£276.91
Each
Units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 PROTECT - - - - 121mm - 100mm 22.5mm
RS Stock No. 666-7022
Mfr. Part No.2981020
£96.65
Each
Units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 3 - - - Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 447-5644
Mfr. Part No.440R-N23123
£108.00
Each
Units
24 V ac/dc 1 - Light Beam/Curtain, Safety Switch/Interlock 2 Minotaur Monitored - - - 22.5mm - 110mm 75mm
RS Stock No. 447-4506
Mfr. Part No.XPSAR311144
£368.00
Each
Units
24 V dc 1, 2 2 Light Beam/Curtain 7 Preventa - - - - 114mm - 99mm 99mm
RS Stock No. 447-5767
Mfr. Part No.440R-M23085
£177.01
Each
Units
230 V ac 1 1 Light Beam/Curtain, Safety Switch/Interlock 2 Minotaur Automatic, Manual, Monitored - Screw - 45mm - 114.5mm 99mm
RS Stock No. 741-8653
Mfr. Part No.SRB301ST-24V-(V.2)
BrandSchmersal
£266.74
Each
Units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm
RS Stock No. 155-850
Mfr. Part No.750126
BrandPilz
£166.55
Each
Units
24 V dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm
RS Stock No. 271-518
Mfr. Part No.UE403-A0930
BrandSick
£276.76
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 918-6649
Mfr. Part No.777512
BrandPilz
£308.49
Each
Units
24 V dc 2 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm 45mm
RS Stock No. 918-6677
Mfr. Part No.774502
BrandPilz
£298.01
Each
Units
24 V dc 2 2 Emergency Stop, Safety Switch/Interlock 2 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 447-4540
Mfr. Part No.XPSDME1132
£279.00
Each
Units
24 V dc 1, 2 2 Safety Switch/Interlock 2 Preventa - - Screw - 114mm - 22.5mm 99mm
RS Stock No. 249-6302
Mfr. Part No.440F-C4000P
£645.00
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 733-2351
Mfr. Part No.2TLA010026R0500
BrandABB
£193.53
Each
Units
230 V ac 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 - - - Terminal Block - 120mm - 84mm 45mm
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