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. 464-502
Mfr. Part No.XPSATE3410P
€350.69
Each
units
115 V ac 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock - - - 2 Preventa Automatic, Manual - Screw - -
RS Stock No. 489-6401
Mfr. Part No.774581
BrandPilz
€144.30
Each
units
24 V dc 1 - Expansion Module - - - 4 PNOZ X - - Screw - -
RS Stock No. 447-4499
Mfr. Part No.XPSAC3721
€147.03
Each
units
230 V ac - 1 Emergency Stop - - - 3 Preventa - - Screw - -
RS Stock No. 250-6459
Mfr. Part No.440R-F23027
€453.70
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock - - - 2 Minotaur Automatic, Manual - - - -
RS Stock No. 382-2049
Mfr. Part No.011-149
BrandSmartscan
€118.51
Each
units
24 V dc 2 1 Light Beam/Curtain - - - 2 - Automatic, Manual - - - -
RS Stock No. 464-489
Mfr. Part No.XPSVNE1142HSP
€334.71
Each
units
24 V dc 2 2 Speed/Standstill Monitoring - - - 2 Preventa - - Screw - -
RS Stock No. 250-6465
Mfr. Part No.440R-F23028
€490.10
Each
units
110 V ac 2 1 Safety Switch/Interlock - - - 2 Minotaur Automatic, Manual - - - -
RS Stock No. 492-5054
Mfr. Part No.UE48-2OS3D2
BrandSick
€208.95
Each
units
24 V ac/dc 1, 2 1 Light Beam/Curtain 4 3 E 2 - - - - - Yes
RS Stock No. 489-6372
Mfr. Part No.777601
BrandPilz
€242.31
Each
units
24 V dc 1, 2 - Safety Switch/Interlock - - - 2 PNOZ X - - Screw - -
RS Stock No. 814-6933
Mfr. Part No.XPSAR311144P
€602.44
Each
units
24 V ac/dc 2 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 7 Preventa Monitored - Screw - -
RS Stock No. 814-6924
Mfr. Part No.XPSAC3421P
€225.93
Each
units
115 V ac 1 1 Emergency Stop, Safety Switch/Interlock - - - 3 Preventa Monitored - Screw - -
RS Stock No. 741-8641
Mfr. Part No.SRB301AN 24VAC/DC
BrandSchmersal
€329.72
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - 4 PROTECT - - - - -
RS Stock No. 447-5593
Mfr. Part No.440R-N23118
€148.20
Each
units
230 V ac 2 - Light Beam/Curtain, Safety Switch/Interlock - - - 2 Minotaur Monitored - - - -
RS Stock No. 464-491
Mfr. Part No.XPSATE5110P
€350.69
Each
units
24 V dc 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock - - - 2 Preventa Automatic, Manual - Screw - -
RS Stock No. 378-5366
Mfr. Part No.774315
BrandPilz
€332.93
Each
units
24 V dc, 115 V ac 2 1 Safety Switch/Interlock - - - 3 PNOZ X Automatic, Monitored - Screw - -
RS Stock No. 757-9326
Mfr. Part No.G9SA-TH301 AC/DC24
BrandOmron
€234.67
Each
units
24 V ac/dc 2 1 Two-Hand Control - - - 3 - - - - - -
RS Stock No. 515-1787
Mfr. Part No.R1.188.0530.1
BrandWieland
€163.72
Each
units
24 V ac/dc 2 1 Two-Hand Control - - - 2 safeRELAY Monitored - Screw - -
RS Stock No. 489-6394
Mfr. Part No.777949
BrandPilz
€447.37
Each
units
24 240 V ac/dc 1, 2 1 Speed/Standstill Monitoring - - - 2 PNOZ X - - Screw - -
RS Stock No. 492-4972
Mfr. Part No.UE401-A0010
BrandSick
€484.63
Each
units
28.8 V dc - - Light Beam/Curtain - - - - - - - Screw - -
RS Stock No. 549-603
Mfr. Part No.G9SB301DACDC24
BrandOmron
€163.98
Each
units
24 V ac/dc 2 1 Emergency Stop - - - 3 - Manual - - - -
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