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. 784-5780
Mfr. Part No.3SK1111-1AB30
BrandSiemens
MYR1,588.72
Each
units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 757-9291
Mfr. Part No.G9SB-2002-C AC/DC24
BrandOmron
MYR920.10
Each
units
24 V ac/dc 2 - Emergency Stop 2 - - - - - 112mm - 100mm 18mm
RS Stock No. 239-1049
Mfr. Part No.774303
BrandPilz
MYR969.95
Each
units
24 V ac/dc 2 - Light Beam/Curtain, Safety Switch/Interlock 2 PNOZ X Manual - Screw - 121mm - 87mm 22.5mm
RS Stock No. 422-5180
Mfr. Part No.XPSAK371144
MYR1,523.96
Each
units
230 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 239-1061
Mfr. Part No.774314
BrandPilz
MYR1,300.39
Each
units
24 V dc, 110 V ac 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 203-8035
Mfr. Part No.774073
BrandPilz
MYR1,198.88
Each
units
24 V dc, 110 V ac 2 - Safety Switch/Interlock 2 - Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 814-6927
Mfr. Part No.XPSAC5121P
MYR1,096.68
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock 3 Preventa Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 240-8709
Mfr. Part No.BD5935.48 AC50/60Hz 230V
BrandDold
MYR2,084.17
Each
units
230 V ac 2 1 Emergency Stop 3 Safemaster Monitored - Terminal Block - 121mm - 74mm 45mm
RS Stock No. 780-5073
Mfr. Part No.R1.188.3580.0 - SNO4083KM-A
BrandWieland
MYR1,323.28
Each
units
24 V dc 2 - - 3 SafeRELAY Manual - Screw - - - - -
RS Stock No. 814-6930
Mfr. Part No.XPSAK311144P
MYR1,659.26
Each
units
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Monitored - Screw - 114mm - 99mm 45mm
RS Stock No. 757-9308
Mfr. Part No.G9SB-3012-C AC/DC24
BrandOmron
MYR981.31
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - - - - - 112mm - 100mm 23mm
RS Stock No. 489-6350
Mfr. Part No.777302
BrandPilz
MYR1,221.02
Each
units
24 → 240 V ac/dc 1, 2 1 Safety Switch/Interlock 3 PNOZ X Manual PLe Category 4 Screw - 121mm - 94mm 22.5mm
RS Stock No. 245-1860
Mfr. Part No.774080
BrandPilz
MYR2,283.15
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 7 - Automatic, Manual, Monitored - Screw - 121mm - 87mm 90mm
RS Stock No. 741-8666
Mfr. Part No.SRB324ST 24V (V.3)
BrandSchmersal
MYR2,797.03
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 45mm
RS Stock No. 780-5095
Mfr. Part No.R1.188.3740.0 - SNO1012K-A
BrandWieland
MYR776.13
Each
units
24 V ac/dc 1 - - 2 SafeRELAY Manual - Screw - - - - -
RS Stock No. 741-8650
Mfr. Part No.SRB 301MC-24V
BrandSchmersal
MYR1,279.15
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. 741-8641
Mfr. Part No.SRB301AN 24VAC/DC
BrandSchmersal
MYR1,971.96
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. 240-8743
Mfr. Part No.BD5987.02/001 AC50/60Hz 230V
BrandDold
MYR1,895.48
Each
units
230 V ac 2 - Emergency Stop 2 Safemaster - - - - 121mm - 74mm 45mm
RS Stock No. 178-2438
Mfr. Part No.775600
BrandPilz
MYR1,923.38
Each
units
24 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 90mm
RS Stock No. 240-8692
Mfr. Part No.BD5935.48 DC24V
BrandDold
MYR2,001.00
Each
units
24 V dc 1, 2 - Emergency Stop 4 Safemaster - - Screw - 121mm - 74mm 45mm