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. 180-3065
Mfr. Part No.788-384
BrandWago
HK$379.12
Each
units
24 V dc - 2 Safety Relay 2 - - - Cage Clamp - 64mm - 15mm 86mm
New
RS Stock No. 191-9868
Mfr. Part No.751160
BrandPilz
HK$1,591.30
Each
units
24 V dc 2 1 Expansion Module - PNOZ s20 Automatic 2, 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 757-9314
Mfr. Part No.G9SA-321-T30 24AC/DC
BrandOmron
HK$2,878.11
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - - - - - 111mm - 94mm 45mm
RS Stock No. 125-1106
Mfr. Part No.XPSVNE3742HSP
HK$5,422.56
Each
units
230 V ac - - - - - - - Screw - 114mm - 45mm 99mm
RS Stock No. 123-2738
Mfr. Part No.280005-P
BrandIDEM
HK$3,294.49
Each
units
24 V ac/dc 2 3 Emergency Stop, Safety Switch/Interlock 7 Viper Automatic, Manual - Plug In CULus, EN 60204-1, EN 62061, EN ISO 12100, EN ISO 13849-1, EN ISO 13849-2, TUV, UL 508 99mm - 45mm 111mm
RS Stock No. 125-1100
Mfr. Part No.XPSPVK3484
HK$7,430.96
Each
units
24 V dc - - Emergency Stop, Safety Switch/Interlock 2 Preventa Manual PLe Category 4, SIL CL3 Screw CSA, TUV, UL - - - -
RS Stock No. 893-7720
Mfr. Part No.2904951
HK$1,023.85
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. 812-8967
Mfr. Part No.ESR5-NO-41-24VAC-DC
BrandEaton
HK$1,796.88
Each
units
- 1 - Emergency Stop, Safety Switch/Interlock 4 - Automatic, Manual - Screw - 99mm - 22.5mm 114.5mm
RS Stock No. 742-7471
Mfr. Part No.2981059
HK$1,889.47
Each
units
24 V ac/dc 2 1 Light Beam/Curtain, Safety Switch/Interlock 3 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 784-5835
Mfr. Part No.3SK1122-2CB41
BrandSiemens
HK$1,863.16
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 801-6028
Mfr. Part No.2981457
HK$949.83
Each
units
24 V ac/dc 1 - - 6 - - 1 Cage Clamp - 56mm - 111mm 40mm
RS Stock No. 203-8063
Mfr. Part No.774030
BrandPilz
HK$1,781.89
Each
units
24 V dc 1 2 Speed/Standstill Monitoring 1 PNOZ X - - Screw - 121mm - 87mm 45mm
RS Stock No. 784-5813
Mfr. Part No.3SK1121-2CB41
BrandSiemens
HK$3,314.37
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 812-8957
Mfr. Part No.ESR5-NO-21-24VAC-DC
BrandEaton
HK$2,286.70
Each
units
- 2 - Emergency Stop, Safety Switch/Interlock 2 - Automatic, Manual - Screw - 99mm - 22.5mm 114.5mm
RS Stock No. 893-7736
Mfr. Part No.2904954
HK$1,155.11
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. 812-3909
Mfr. Part No.XPSBAE3920P
HK$1,750.32
Each
units
115 230 V ac - 1 Two-Hand Control 2 Preventa - - Screw - 99mm - 22.5mm 114mm
RS Stock No. 180-6088
Mfr. Part No.1085343
BrandSick
HK$1,422.14
Each
units
30 V dc 2 - Safety Monitoring 2 - - Cat 4 Plug In - 124.6mm - 18mm 85.5mm
New
RS Stock No. 191-9866
Mfr. Part No.751136
BrandPilz
HK$3,499.61
Each
units
48 240 V ac/dc 2 1 - 3 PNOZ s6 Monitored 4 Screw - 120mm - 98mm 22.5mm
New
RS Stock No. 191-9863
Mfr. Part No.751132
BrandPilz
HK$2,052.91
Each
units
24 V dc 2 2 Safety Switch 3 PNOZ s22 Automatic 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 123-2736
Mfr. Part No.280001-P
BrandIDEM
HK$1,467.07
Each
units
24 V ac/dc 1 1 Emergency Stop 3 Viper Automatic - Plug In CULus, EN 60204-1, EN 62061, EN ISO 12100, EN ISO 13849-1, EN ISO 13849-2, TUV, UL 508 99mm - 22.5mm 114mm
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