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. 324-7280
Mfr. Part No.774325
BrandPilz
HK$1,555.15
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 447-4540
Mfr. Part No.XPSDME1132
HK$2,153.27
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock 2 Preventa - - Screw - 114mm - 22.5mm 99mm
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
HK$1,613.77
Each
units
24 V dc 2 1 Emergency Stop 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 447-4477
Mfr. Part No.XPSAC5121
HK$1,664.03
Each
units
24 V ac/dc - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 447-4499
Mfr. Part No.XPSAC3721
HK$1,167.25
Each
units
230 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 731-8951
Mfr. Part No.XPSBCE3110P
HK$3,186.96
Each
units
24 V ac/dc - 1 Two-Hand Control 2 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 327-7613
Mfr. Part No.BH5928.92 DC24V 1-10S
BrandDold
HK$3,301.70
Each
units
24 V ac/dc 1, 2 - Emergency Stop 3 Safemaster - - - - 118mm - 84mm 45mm
RS Stock No. 245-1860
Mfr. Part No.774080
BrandPilz
HK$2,558.21
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 7 - Automatic, Manual, Monitored - Screw - 121mm - 87mm 90mm
RS Stock No. 918-6649
Mfr. Part No.777512
BrandPilz
HK$3,406.91
Each
units
24 V dc 2 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm 45mm
RS Stock No. 245-1854
Mfr. Part No.774318
BrandPilz
HK$3,159.19
Each
units
24 V dc, 230 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 757-9304
Mfr. Part No.G9SB-3012-A AC/DC24
BrandOmron
HK$1,337.53
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - - - - - 112mm - 100mm 23mm
RS Stock No. 245-1905
Mfr. Part No.774500
BrandPilz
HK$3,111.07
Each
units
24 V dc 2 - Safety Switch/Interlock 2 PNOZ X Automatic, Manual, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 245-1848
Mfr. Part No.774310
BrandPilz
HK$1,990.79
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 360-4346
Mfr. Part No.XPSAF5130
HK$1,902.67
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 464-495
Mfr. Part No.XPSATE3710P
HK$6,167.80
Each
units
230 V ac 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 2 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 893-7711
Mfr. Part No.2904950
HK$1,046.64
Each
units
24 V dc 1 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Automatic 1 Screw CUL, CULus, EAC, Functional Safety, UL 102.5mm - 93.1mm 6.8mm
RS Stock No. 918-6645
Mfr. Part No.777313
BrandPilz
HK$2,286.79
Each
units
24 → 240 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm 45mm
RS Stock No. 836-2738
Mfr. Part No.G7SA5A1B24DC
BrandOmron
HK$327.98
Each
units
24 V dc - - - - - - - - - 24mm - 50mm 13mm
RS Stock No. 918-6686
Mfr. Part No.777301
BrandPilz
HK$2,198.08
Each
units
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm 22.5mm
RS Stock No. 666-7044
Mfr. Part No.2963802
HK$1,207.64
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock 4 - - 1 Screw - 114.5mm - 99mm 22.5mm
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