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. 245-1854
Mfr. Part No.774318
BrandPilz
MYR1,054.92
Each
units
24 V dc, 230 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 239-1033
Mfr. Part No.774300
BrandPilz
MYR779.62
Each
units
24 V ac/dc 1 1 Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 22.5mm
RS Stock No. 156-112
Mfr. Part No.750134
BrandPilz
MYR1,213.67
Each
units
48 → 240 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 245-1905
Mfr. Part No.774500
BrandPilz
MYR1,903.84
Each
units
24 V dc 2 - Safety Switch/Interlock 2 PNOZ X Automatic, Manual, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 378-5366
Mfr. Part No.774315
BrandPilz
MYR1,174.75
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
MYR2,201.45
Each
units
24 V dc 2 2 Emergency Stop, Safety Switch/Interlock 2 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 324-7280
Mfr. Part No.774325
BrandPilz
MYR917.27
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 245-1848
Mfr. Part No.774310
BrandPilz
MYR1,054.92
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 324-7274
Mfr. Part No.774059
BrandPilz
MYR792.94
Each
units
24 V ac/dc 1 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
MYR1,332.77
Each
units
24 V dc 2 1 Emergency Stop 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 155-822
Mfr. Part No.750105
BrandPilz
MYR2,284.68
Each
units
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 239-1061
Mfr. Part No.774314
BrandPilz
MYR1,174.75
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. 239-1049
Mfr. Part No.774303
BrandPilz
MYR950.93
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. 203-8035
Mfr. Part No.774073
BrandPilz
MYR1,083.86
Each
units
24 V dc, 110 V ac 2 - Safety Switch/Interlock 2 - Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 245-1860
Mfr. Part No.774080
BrandPilz
MYR2,019.23
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 7 - Automatic, Manual, Monitored - Screw - 121mm - 87mm 90mm
RS Stock No. 489-6350
Mfr. Part No.777302
BrandPilz
MYR1,103.40
Each
units
24 → 240 V ac/dc 1, 2 1 Safety Switch/Interlock 3 PNOZ X - - Screw - 121mm - 94mm 22.5mm
RS Stock No. 178-2438
Mfr. Part No.775600
BrandPilz
MYR1,813.65
Each
units
24 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 90mm
RS Stock No. 489-6417
Mfr. Part No.774583
BrandPilz
MYR840.31
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 324-7268
Mfr. Part No.774056
BrandPilz
MYR729.50
Each
units
230 V ac 1 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 489-6401
Mfr. Part No.774581
BrandPilz
MYR840.31
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm 22.5mm