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. 156-106
Mfr. Part No.750104
BrandPilz
$377.40
Each
units
24 V dc 2 1 Emergency Stop 4 3 E 3 PNOZsigma Automatic, Manual, Monitored - Screw - Yes
RS Stock No. 360-4346
Mfr. Part No.XPSAF5130
$627.30
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 4 3 E 3 Preventa - - Screw - Yes
RS Stock No. 447-4477
Mfr. Part No.XPSAC5121
$343.85
Each
units
24 V ac/dc - 1 Emergency Stop 4 3 E 3 Preventa - - Screw - -
RS Stock No. 156-083
Mfr. Part No.750103
BrandPilz
$461.84
Each
units
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 3 E 2 PNOZsigma Automatic, Manual, Monitored - Screw - Yes
RS Stock No. 245-1848
Mfr. Part No.774310
BrandPilz
$667.02
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 4 3 E 3 PNOZ X Automatic, Monitored - Screw - -
RS Stock No. 321-9049
Mfr. Part No.SNO 4062K-A-00C
BrandWieland
$286.68
Each
units
24 V ac/dc 2 1 Emergency Stop 4 3 E 2 SafeRELAY - - Screw - -
RS Stock No. 666-7040
Mfr. Part No.2963763
$195.08
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 4 3 E 3 - - 3 Screw - No
RS Stock No. 155-822
Mfr. Part No.750105
BrandPilz
$682.19
Each
units
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 3 E 2 PNOZsigma Automatic, Manual, Monitored - Screw - Yes
RS Stock No. 701-9212
Mfr. Part No.UE10-2FG2DO
BrandSick
$147.90
Each
units
24 V dc 1, 2 - Light Beam/Curtain 4 3 E 3 - - - Screw - -
RS Stock No. 890-3389
Mfr. Part No.G9SE-201-DC24
BrandOmron
$168.75
Each
units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 - - 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 Yes
RS Stock No. 245-1905
Mfr. Part No.774500
BrandPilz
$1,043.88
Each
units
24 V dc 2 - Safety Switch/Interlock 4 3 E 2 PNOZ X Automatic, Manual, Monitored - Screw - -
RS Stock No. 422-5152
Mfr. Part No.XPSAK311144
$459.08
Each
units
24 V ac/dc 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 3 E 3 Preventa Automatic, Manual - Screw - Yes
RS Stock No. 489-6394
Mfr. Part No.777949
BrandPilz
$1,487.37
Each
units
24 → 240 V ac/dc 1, 2 1 Speed/Standstill Monitoring 3 3 E 2 PNOZ X - - Screw - -
RS Stock No. 609-7167
Mfr. Part No.XPSAFL5130
$306.06
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain 4 3 E 3 Preventa - - Screw - -
RS Stock No. 239-1055
Mfr. Part No.774306
BrandPilz
$496.38
Each
units
24 V ac/dc 2 - Safety Switch/Interlock 4 3 E 2 PNOZ X Automatic, Manual - Screw - -
RS Stock No. 890-3395
Mfr. Part No.G9SE-221-T30-DC24
BrandOmron
$234.04
Each
units
24 V dc 2 1 Emergency Stop 4 - - 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 Yes
RS Stock No. 492-5054
Mfr. Part No.UE48-2OS3D2
BrandSick
$249.90
Each
units
24 V ac/dc 1, 2 1 Light Beam/Curtain 4 3 E 2 - - - - - Yes
RS Stock No. 156-099
Mfr. Part No.750102
BrandPilz
$459.58
Each
units
24 V dc 1 1 Emergency Stop, Safety Switch/Interlock 4 3 E 3 PNOZsigma Automatic, Manual, Monitored - Screw - Yes
RS Stock No. 733-2436
Mfr. Part No.2TLA020052R1000
BrandABB
$726.34
Each
units
24 V dc - - Light Beam/Curtain, Safety Switch/Interlock 4 3 E 2 - Automatic, Manual - Screw - -
RS Stock No. 362-0168
Mfr. Part No.774585
BrandPilz
$406.71
Each
units
24 V dc 1 - Expansion Module 4 3 E 4 PNOZ X Automatic - Screw - -
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