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. 360-4346
Mfr. Part No.XPSAF5130
TWD6,726.00
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 245-1854
Mfr. Part No.774318
BrandPilz
TWD8,032.00
Each
units
24 V dc, 230 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 784-5793
Mfr. Part No.3SK1111-2AB30
BrandSiemens
TWD7,477.00
Each
units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 245-1905
Mfr. Part No.774500
BrandPilz
TWD11,140.00
Each
units
24 V dc 2 - Safety Switch/Interlock 2 PNOZ X Automatic, Manual, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 549-609
Mfr. Part No.G9SA-301 24AC/DC
BrandOmron
TWD7,383.00
Each
units
24 V ac/dc 1, 2 1 Emergency Stop 3 - - - - - 111mm - 76mm 45mm
RS Stock No. 378-5366
Mfr. Part No.774315
BrandPilz
TWD14,150.00
Each
units
24 V dc, 115 V ac 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 918-6677
Mfr. Part No.774502
BrandPilz
TWD12,794.00
Each
units
24 V dc 2 2 Emergency Stop, Safety Switch/Interlock 2 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 666-7062
Mfr. Part No.2981680
TWD4,213.00
Each
units
24 V dc 1 - Expansion Module 6 - - 3 Screw - 114.5mm - 112mm 22.5mm
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
TWD8,511.00
Each
units
24 V dc 2 1 Emergency Stop 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 666-7069
Mfr. Part No.2981499
TWD5,894.00
Each
units
24 V dc 2 1 Safety Switch/Interlock 2 - - 3 Screw - 114.5mm - 112mm 22.5mm
RS Stock No. 122-2499
Mfr. Part No.R1.188.0620.0
BrandWieland
TWD8,448.00
Each
units
24 V dc 2 - Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 SafeRELAY Monitored - Screw CCC, CPT, CULus, EN 50156-1, EN 62061, EN ISO 13849-1, FS, GL, GOST R, TUV 96.5mm - 22.5mm 114mm
RS Stock No. 489-6394
Mfr. Part No.777949
BrandPilz
TWD16,577.00
Each
units
24 240 V ac/dc 1, 2 1 Speed/Standstill Monitoring 2 PNOZ X - - Screw - 121mm - 94mm 45mm
RS Stock No. 492-5054
Mfr. Part No.UE48-2OS3D2
BrandSick
TWD8,100.00
Each
units
24 V ac/dc 1, 2 1 Light Beam/Curtain 2 - - - - - 114mm - 96.5mm 22.5mm
RS Stock No. 477-3847
Mfr. Part No.XPSAV11113
TWD12,800.00
Each
units
24 V 1, 2 - Emergency Stop 3 Preventa - - - - 114mm - 99mm 45mm
RS Stock No. 489-6350
Mfr. Part No.777302
BrandPilz
TWD7,657.00
Each
units
24 240 V ac/dc 1, 2 1 Safety Switch/Interlock 3 PNOZ X - - Screw - 121mm - 94mm 22.5mm
RS Stock No. 515-1759
Mfr. Part No.R1.188.0500.1
BrandWieland
TWD5,034.00
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 3 SafeRELAY Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 515-1787
Mfr. Part No.R1.188.0530.1
BrandWieland
TWD5,805.00
Each
units
24 V ac/dc 2 1 Two-Hand Control 2 SafeRELAY Monitored - Screw - 114mm - 96.5mm 22.5mm
RS Stock No. 757-9310
Mfr. Part No.G9SA-321-T075 AC/DC24
BrandOmron
TWD10,813.00
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - - - - - 111mm - 94mm 45mm
RS Stock No. 239-1033
Mfr. Part No.774300
BrandPilz
TWD5,526.00
Each
units
24 V ac/dc 1 1 Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 22.5mm
RS Stock No. 741-8650
Mfr. Part No.SRB 301MC-24V
BrandSchmersal
TWD5,536.00
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm