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. 701-9212
Mfr. Part No.UE10-2FG2D0
BrandSick
HK$782.17
Each
units
24 V dc 1, 2 - Light Beam/Curtain 3 - - - Screw - 70.8mm - 89.8mm 17.8mm
RS Stock No. 701-9216
Mfr. Part No.UE12-2FG2DO
BrandSick
HK$952.04
Each
units
24 V dc 1, 2 - Light Beam/Curtain 3 - - - Screw - 70.8mm - 89.8mm 17.8mm
RS Stock No. 492-5054
Mfr. Part No.UE48-2OS3D2
BrandSick
HK$2,011.85
Each
units
24 V ac/dc 1, 2 1 Light Beam/Curtain 2 - - - - - 114mm - 96.5mm 22.5mm
RS Stock No. 492-4972
Mfr. Part No.UE401-A0010
BrandSick
HK$4,761.05
Each
units
28.8 V dc - - Light Beam/Curtain - - - - Screw - 113.5mm - 66mm 22.6mm
RS Stock No. 180-6091
Mfr. Part No.1085345
BrandSick
HK$1,925.35
Each
units
30 V dc 2 - - 2 - Automatic, Manual Cat 4 Plug In - 124.6mm - 18mm 85.5mm
RS Stock No. 271-518
Mfr. Part No.UE403-A0930
BrandSick
HK$3,181.16
Each
units
- - - - - - - - - - - - - -
RS Stock No. 180-6090
Mfr. Part No.1085344
BrandSick
HK$1,934.49
Each
units
30 V dc - - - 2 - Automatic, Manual Cat 4 Plug In - 124.6mm - 18mm 85.5mm
RS Stock No. 271-502
Mfr. Part No.UE10-3OS3D0
BrandSick
HK$1,569.10
Each
units
24 V dc - - - - - - - - - - - - -
RS Stock No. 180-6088
Mfr. Part No.1085343
BrandSick
HK$1,157.59
Each
units
30 V dc 2 - Safety Monitoring 2 - - Cat 4 Plug In - 124.6mm - 18mm 85.5mm
RS Stock No. 180-6092
Mfr. Part No.1085346
BrandSick
HK$1,925.35
Each
units
30 V dc 2 - - 2 - - Cat 4 Plug In - 124.6mm - 18mm 85.5mm