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. 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. 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. 893-7708
Mfr. Part No.2700548
TWD4,712.00
Each
units
24 V dc 2 3 Emergency Stop, Safety Switch/Interlock 3 PSRmini Automatic, Manual - Cage Clamp CUL, CULus, EAC, Functional Safety, UL 114.5mm - 12.5mm 116.6mm
RS Stock No. 666-7038
Mfr. Part No.2963912
TWD10,515.00
Each
units
24 V ac/dc 1, 2 1 Emergency Stop, Safety Switch/Interlock 8 - - 3 Screw - 114.5mm - 99mm 45mm
RS Stock No. 893-7720
Mfr. Part No.2904951
TWD3,577.00
Each
units
24 V dc 1 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Manual 1 Screw CUL, CULus, EAC, Functional Safety, UL 102.5mm - 93.1mm 6.8mm
RS Stock No. 177-4033
Mfr. Part No.2702192
TWD3,516.00
Each
units
24 V dc 1 - - 1 - Manual 1 Terminal Block - 102.5mm - 93.1mm 6.8mm
RS Stock No. 666-7053
Mfr. Part No.2981428
TWD17,794.00
Each
units
24 V dc 2 - Light Beam/Curtain, Safety Switch/Interlock 6 - - 3 Screw - 114.5mm - 99mm 45mm
RS Stock No. 712-5260
Mfr. Part No.2986960
TWD5,046.00
Each
units
24 V dc - - - 3 - - 3 Screw - 114.5mm - 99mm 17.5mm
RS Stock No. 893-7739
Mfr. Part No.2904955
TWD3,706.00
Each
units
24 V dc 2 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Manual 4 Screw CUL, CULus, EAC, Functional Safety, UL 102.5mm - 93.1mm 6.8mm
RS Stock No. 893-7723
Mfr. Part No.2904952
TWD3,706.00
Each
units
24 V dc 2 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Automatic - Screw CUL, CULus, EAC, Functional Safety, UL 102.5mm - 6.8mm 93.1mm
RS Stock No. 893-7727
Mfr. Part No.2904953
TWD3,706.00
Each
units
24 V dc 2 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Manual 3 Screw CUL, CULus, EAC, Functional Safety, UL 102.5mm - 93.1mm 6.8mm
RS Stock No. 666-7047
Mfr. Part No.2963750
TWD4,769.00
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 2 - - 3 Screw - 114.5mm - 99mm 22.5mm
New
RS Stock No. 190-8413
Mfr. Part No.2702524
TWD6,235.00
Each
units
24 V dc 2 - - 1 - - SIL 3 Screw - 93.1mm ATEX, IECEx 6.8mm 102.5mm
RS Stock No. 893-7682
Mfr. Part No.2700467
TWD4,608.00
Each
units
24 V dc 1 3 Emergency Stop, Safety Switch/Interlock 3 PSRmini Automatic, Manual 1 Cage Clamp CUL, CULus, EAC, Functional Safety, UL 114.5mm - 112.2mm 12.5mm
RS Stock No. 177-4032
Mfr. Part No.2702097
TWD7,222.00
Each
units
24 V dc 2 - Emergency Stop 2 - Manual 1 Terminal Block DIN EN 50178 114.5mm - 116.6mm 12.5mm
RS Stock No. 801-5873
Mfr. Part No.2901422
TWD5,787.00
Each
units
120 V ac/dc 2 - Safety Switch/Interlock 4 - Automatic, Manual 3 Cage Clamp - 114.5mm - 99mm 22.5mm
RS Stock No. 893-7705
Mfr. Part No.2700570
TWD4,737.00
Each
units
24 V dc 2 3 Emergency Stop, Safety Switch/Interlock 3 PSRmini Automatic, Manual 4 Cage Clamp CUL, CULus, EAC, Functional Safety, UL 114.5mm - 116.6mm 12.5mm
RS Stock No. 666-7066
Mfr. Part No.2981745
TWD5,954.00
Each
units
24 V dc 1 - Expansion Module 6 - - - Screw - 114.5mm - 112mm 22.5mm
RS Stock No. 177-4034
Mfr. Part No.2700525
TWD12,341.00
Each
units
24 230 V ac/dc 2 - Emergency Stop 3 - Manual 2 Terminal Block - 114.5mm - 117.4mm 22.5mm
RS Stock No. 712-5250
Mfr. Part No.2900509
TWD5,488.00
Each
units
24 V ac/dc 1, 2 1 Safety Switch/Interlock 3 - - 3 Screw - 114.5mm - 99mm 22.5mm