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. 245-1854
Mfr. Part No.774318
BrandPilz
MYR1,488.35
Each
units
24 V dc, 230 V ac 2 1 Emergency Stop 4 3 E 3 PNOZ X Automatic, Monitored - Screw - -
RS Stock No. 239-1033
Mfr. Part No.774300
BrandPilz
MYR908.22
Each
units
24 V ac/dc 1 1 Safety Switch/Interlock 4 3 E 3 PNOZ X Automatic, Manual - Screw - -
RS Stock No. 156-112
Mfr. Part No.750134
BrandPilz
MYR1,129.65
Each
units
48 → 240 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 3 E 3 PNOZsigma Automatic, Manual, Monitored - Screw - Yes
RS Stock No. 245-1905
Mfr. Part No.774500
BrandPilz
MYR1,973.33
Each
units
24 V dc 2 - Safety Switch/Interlock 4 3 E 2 PNOZ X Automatic, Manual, Monitored - Screw - -
RS Stock No. 378-5366
Mfr. Part No.774315
BrandPilz
MYR1,158.98
Each
units
24 V dc, 115 V ac 2 1 Safety Switch/Interlock 4 3 E 3 PNOZ X Automatic, Monitored - Screw - -
RS Stock No. 814-6921
Mfr. Part No.XPSAFL5130P
MYR1,004.56
Each
units
24 V ac/dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 3 E 3 Preventa Monitored - Screw - -
RS Stock No. 918-6677
Mfr. Part No.774502
BrandPilz
MYR2,671.97
Each
units
24 V dc 2 2 Emergency Stop, Safety Switch/Interlock - - - 2 PNOZ X Automatic, Manual - Screw - -
RS Stock No. 324-7280
Mfr. Part No.774325
BrandPilz
MYR876.29
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 3 E 2 PNOZ X - - Screw - -
RS Stock No. 245-1848
Mfr. Part No.774310
BrandPilz
MYR1,435.08
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 4 3 E 3 PNOZ X Automatic, Monitored - Screw - -
RS Stock No. 712-5266
Mfr. Part No.2986588
MYR533.63
Each
units
24 V dc - - - 1 2 - 3 - - 2 Screw - No
RS Stock No. 324-7274
Mfr. Part No.774059
BrandPilz
MYR743.04
Each
units
24 V ac/dc 1 - Safety Switch/Interlock 2 3 E 2 PNOZ X - - Screw - -
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
MYR1,863.03
Each
units
24 V dc 2 1 Emergency Stop 4 3 E 3 PNOZsigma Automatic, Manual, Monitored - Screw - Yes
RS Stock No. 733-2341
Mfr. Part No.2TLA010026R0000
BrandABB
MYR927.01
Each
units
24 V dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 3 E 4 - - - Terminal Block - -
RS Stock No. 447-4477
Mfr. Part No.XPSAC5121
MYR1,263.12
Each
units
24 V ac/dc - 1 Emergency Stop 4 3 E 3 Preventa - - Screw - -
RS Stock No. 155-822
Mfr. Part No.750105
BrandPilz
MYR1,907.11
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. 712-5263
Mfr. Part No.2986575
MYR539.41
Each
units
24 V dc - - - - 2 - 3 - - - Screw - -
RS Stock No. 860-3770
Mfr. Part No.G9SR-AD201-RC
BrandOmron
MYR660.01
Each
units
19.2 → 28.8 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 3 E 2 - - - Cage Clamp - Yes
RS Stock No. 890-3389
Mfr. Part No.G9SE-201-DC24
BrandOmron
MYR520.18
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. 515-1759
Mfr. Part No.R1.188.0500.1
BrandWieland
MYR552.16
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 2 2 D 3 SafeRELAY Monitored - Screw - -
RS Stock No. 422-5152
Mfr. Part No.XPSAK311144
MYR2,005.69
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
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