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 Safety Contacts Function Auxiliary Contacts Reset Method Range Safety Category Terminal Type Standards Met Depth Hazardous Area Certification Length Width
RS Stock No. 239-1055
Mfr. Part No.774306
BrandPilz
PHP12,517.02
Each
units
24 V ac/dc 2 2 Safety Switch/Interlock - Automatic, Manual PNOZ X - Screw - 121mm - 87mm 22.5mm
RS Stock No. 378-5366
Mfr. Part No.774315
BrandPilz
PHP30,424.29
Each
units
24 V dc, 115 V ac 2 3 Safety Switch/Interlock 1 Automatic, Monitored PNOZ X - Screw - 121mm - 87mm 45mm
RS Stock No. 245-1905
Mfr. Part No.774500
BrandPilz
PHP28,442.24
Each
units
24 V dc 2 2 Safety Switch/Interlock - Automatic, Manual, Monitored PNOZ X - Screw - 121mm - 87mm 45mm
RS Stock No. 733-2341
Mfr. Part No.2TLA010026R0000 RT6 24DC
BrandABB
PHP16,167.31
Each
units
24 V dc 1, 2 4 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - - Terminal Block - 120mm - 84mm 45mm
RS Stock No. 155-822
Mfr. Part No.750105
BrandPilz
PHP32,212.46
Each
units
24 V dc 2 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - Automatic, Manual, Monitored PNOZsigma - Screw - 120mm - 102mm 22.5mm
RS Stock No. 239-1061
Mfr. Part No.774314
BrandPilz
PHP20,353.63
Each
units
24 V dc, 110 V ac 2 3 Safety Switch/Interlock 1 Automatic, Monitored PNOZ X - Screw - 121mm - 87mm 45mm
RS Stock No. 239-1033
Mfr. Part No.774300
BrandPilz
PHP13,089.21
Each
units
24 V ac/dc 1 3 Safety Switch/Interlock 1 Automatic, Manual PNOZ X - Screw - 121mm - 87mm 22.5mm
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
PHP29,263.40
Each
units
24 V dc 2 3 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 1 Automatic, Manual, Monitored PNOZsigma - Screw - 120mm - 102mm 22.5mm
RS Stock No. 918-6677
Mfr. Part No.774502
BrandPilz
PHP32,305.66
Each
units
24 V dc 2 2 Emergency Stop, Safety Switch/Interlock 2 Automatic, Manual PNOZ X PLe Category 4, SIL CL3 Screw - 121mm - 87mm 45mm
RS Stock No. 324-7268
Mfr. Part No.774056
BrandPilz
PHP9,307.14
Each
units
230 V ac 1 2 Safety Switch/Interlock - Automatic, Manual PNOZ X PLe Category 4 Screw - 121mm - 87mm 22.5mm
RS Stock No. 733-2391
Mfr. Part No.2TLA010029R0000 RT9 24DC
BrandABB
PHP15,432.72
Each
units
24 V dc 1, 2 2 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - - Terminal Block - 120mm - 84mm 22.5mm
RS Stock No. 178-2438
Mfr. Part No.775600
BrandPilz
PHP26,661.20
Each
units
24 V ac 2 3 Emergency Stop 1 Automatic, Manual PNOZ X - Screw - 121mm - 87mm 90mm
RS Stock No. 447-4477
Mfr. Part No.XPSAC5121
PHP20,223.42
Each
units
24 V ac/dc - 3 Emergency Stop 1 - Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 324-7274
Mfr. Part No.774059
BrandPilz
PHP11,570.71
Each
units
24 V ac/dc 1 2 Safety Switch/Interlock - Automatic, Manual PNOZ X PLe Category 4 Screw - 121mm - 87mm 22.5mm
RS Stock No. 245-1848
Mfr. Part No.774310
BrandPilz
PHP18,205.99
Each
units
24 V ac/dc 2 3 Safety Switch/Interlock 1 Automatic, Monitored PNOZ X - Screw - 121mm - 87mm 45mm
RS Stock No. 360-4346
Mfr. Part No.XPSAF5130
PHP23,405.81
Each
units
24 V ac/dc 1, 2 3 Safety Switch/Interlock - - Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 666-7044
Mfr. Part No.2963802
PHP9,929.85
Each
units
24 V ac/dc 1 4 Emergency Stop, Safety Switch/Interlock 1 - - 1 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 327-7629
Mfr. Part No.BG5925.22 AC/DC24V
BrandDold
PHP17,215.31
Each
units
24 V ac/dc 1, 2 3 Emergency Stop - - Safemaster - - - 118mm - 84mm 22.5mm
RS Stock No. 102-490
Mfr. Part No.50.12.9.005.1000
BrandFinder
PHP1,054.91
Each
units
- - - - - - - - - - - - - -
RS Stock No. 362-0152
Mfr. Part No.774709
BrandPilz
PHP28,105.92
Each
units
24 V dc 1, 2 6 Safety Switch/Interlock 4 Automatic, Manual PNOZ X PLe Category 4 Screw - 121mm - 87mm 90mm