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. 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. 447-5559
Mfr. Part No.440R-N23114
€127.79
Each
units
24 V ac/dc 2 - Light Beam/Curtain, Safety Switch/Interlock - - - 2 Minotaur Automatic, Manual - - - -
RS Stock No. 666-7078
Mfr. Part No.2981936
€72.38
Each
units
24 V dc - - Safety Switch/Interlock - - - - - - - - - -
RS Stock No. 447-5543
Mfr. Part No.440R-N23113
€163.80
Each
units
115 V ac 2 - Light Beam/Curtain, Safety Switch/Interlock - - - 2 Minotaur Automatic, Manual - - - -
RS Stock No. 447-5650
Mfr. Part No.440R-N23130
€236.60
Each
units
230 V ac 1 1 Light Beam/Curtain, Safety Switch/Interlock - - - 3 Minotaur Automatic, Manual - Screw - -
RS Stock No. 780-5073
Mfr. Part No.R1.188.3580.0 - SNO4083KM-A
BrandWieland
€217.73
Each
units
24 V dc 2 - - - - - 3 safeRELAY Manual - Screw - -
RS Stock No. 447-5537
Mfr. Part No.440R-N23112
€163.80
Each
units
230 V ac 2 - Light Beam/Curtain, Safety Switch/Interlock - - - 2 Minotaur Automatic, Manual - - - -
RS Stock No. 447-4483
Mfr. Part No.XPSAC3421
€147.03
Each
units
115 V ac - 1 Emergency Stop - - - 3 Preventa - - Screw - -
RS Stock No. 447-5565
Mfr. Part No.440R-N23115
€148.20
Each
units
230 V ac 1 - Light Beam/Curtain, Safety Switch/Interlock - - - 2 Minotaur Automatic, Manual - - - -
RS Stock No. 240-8793
Mfr. Part No.BD5980N.02 DC24V
BrandDold
€322.20
Each
units
24 V dc 2 - Two-Hand Control - - - 2 Safemaster - - Screw - -
RS Stock No. 918-6686
Mfr. Part No.777301
BrandPilz
€166.40
Each
units
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 3 PNOZ X Automatic, Manual - Screw - -
RS Stock No. 656-6067
Mfr. Part No.RK5942.02 DC24V
BrandDold
€119.34
Each
units
24 V dc 1 - Emergency Stop - - - 1 Safemaster - - Screw - -
RS Stock No. 447-4534
Mfr. Part No.XPSDMB1132
€174.32
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock - - - 2 Preventa - - Screw - -
RS Stock No. 836-2738
Mfr. Part No.G7SA5A1B24DC
BrandOmron
€34.12
Each
units
24 V dc - - - - - - - - - - - - -
RS Stock No. 481-8237
Mfr. Part No.XPSAK351144
€217.89
Each
units
120 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - 3 Preventa Automatic, Manual - Screw - -
RS Stock No. 609-7151
Mfr. Part No.XPSAC1321
€142.41
Each
units
48 V ac - 1 Emergency Stop - - - 3 Preventa - - Screw - -
RS Stock No. 890-3386
Mfr. Part No.G9SE-221-T05-DC24
BrandOmron
€134.23
Each
units
24 V dc 2 1 Emergency Stop - - - 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. 917-6673
Mfr. Part No.2TLA010033R3000
BrandABB
€133.58
Each
units
24 V dc 2 - Emergency Stop, Safety Switch/Interlock - - - 4 - Automatic - Screw CCC, cCSAus, CE, EN 60204-1:2006 + A1:2009, EN 62061:2005, EN 954-1:1996, EN ISO 12100-1:2003, EN ISO 12100-2:2003, EN ISO 13849-1:2008, IEC 60529, IEC 60947-5-1:2009, TUV -
RS Stock No. 324-7280
Mfr. Part No.774325
BrandPilz
€157.52
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock - - - 2 PNOZ X - - Screw - -
RS Stock No. 422-5203
Mfr. Part No.XPSAK351144P
€228.74
Each
units
24 V dc, 120 V ac 1, 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - 3 Preventa - - Screw - -
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