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. 177-4036
Mfr. Part No.2700575
HK$2,136.65
Each
units
24 V dc 2 - Two Hand Control 2 - Manual 1 Terminal Block - 114.5mm - 116.6mm 12.5mm
RS Stock No. 515-1759
Mfr. Part No.R1.188.0500.1
BrandWieland
HK$1,306.84
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 3 SafeRELAY Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 860-3770
Mfr. Part No.G9SR-AD201-RC
BrandOmron
HK$1,298.44
Each
units
19.2 28.8 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 - - - Cage Clamp - 22.5mm - 114.5mm 99mm
RS Stock No. 327-7629
Mfr. Part No.BG5925.22 AC/DC24V
BrandDold
HK$2,005.55
Each
units
24 V ac/dc 1, 2 - Emergency Stop 3 Safemaster - - - - 118mm - 84mm 22.5mm
RS Stock No. 780-5073
Mfr. Part No.R1.188.3580.0 - SNO4083KM-A
BrandWieland
HK$2,125.78
Each
units
24 V dc 2 - - 3 SafeRELAY Manual - Screw - - - - -
RS Stock No. 917-6673
Mfr. Part No.2TLA010033R3000
BrandABB
HK$1,305.08
Each
units
24 V dc 2 - Emergency Stop, Safety Switch/Interlock 4 - Automatic - Screw CCC, CCSAus, CE, EN 60204-1:2006 + A1:2009, EN 62061:2005, EN 954-1:1996, EN ISO 12100-1:2003, EN ISO 12100-2:2003, EN ISO 13849-1:2008, IEC 60529, IEC 60947-5-1:2009, TUV 120mm - 22.5mm 84mm
RS Stock No. 125-1103
Mfr. Part No.XPSTSA5142P
HK$2,024.88
Each
units
24 V ac/dc - - Safety Switch/Interlock - Preventa Manual PLd Category 3, SIL CL2 Screw CSA, EN/IEC 60204-1, EN/IEC 60947-5-1, TUV, UL 114mm - 45mm 99mm
RS Stock No. 464-489
Mfr. Part No.XPSVNE1142HSP
HK$4,038.32
Each
units
24 V dc 2 2 Speed/Standstill Monitoring 2 Preventa - - Screw - 99mm - 120mm 45mm
RS Stock No. 181-2780
Mfr. Part No.UG6980.02PS/61 DC24V
BrandDold
HK$1,774.23
Each
units
24 V dc 2 - - 2 - Auto Start, Manual PL e 4, SIL 3, 4 Screw - 110mm - 22.5mm 120.3mm
RS Stock No. 447-4534
Mfr. Part No.XPSDMB1132
HK$2,204.36
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock 2 Preventa - - Screw - 114mm - 22.5mm 99mm
RS Stock No. 666-7078
Mfr. Part No.2981936
HK$812.93
Each
units
24 V dc - - Safety Switch/Interlock - - - - - - 106mm - 99mm 22.5mm
New
RS Stock No. 191-9856
Mfr. Part No.751105
BrandPilz
HK$2,926.47
Each
units
24 V dc 2 - - 2 PNOZ s5 Automatic, Manual 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 814-6924
Mfr. Part No.XPSAC3421P
HK$1,761.76
Each
units
115 V ac 1 1 Emergency Stop, Safety Switch/Interlock 3 Preventa Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 492-4972
Mfr. Part No.UE401-A0010
BrandSick
HK$4,738.56
Each
units
28.8 V dc - - Light Beam/Curtain - - - - Screw - 113.5mm - 66mm 22.6mm
RS Stock No. 155-872
Mfr. Part No.750156
BrandPilz
HK$2,014.13
Each
units
48 240 V ac/dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm
RS Stock No. 731-8960
Mfr. Part No.XPSBCE3410C
HK$3,271.84
Each
units
115 V ac - 1 Two-Hand Control 2 Preventa - - Cage Clamp - 114mm - 111mm 22.5mm
RS Stock No. 177-9020
Mfr. Part No.SCR4-W22-3.5-SD
HK$1,243.30
Each
units
24 V dc, 230 V ac 1 3NO/NC Two-Hand Control - - - - Screw - 114.5mm - 22.5mm 99mm
RS Stock No. 666-7053
Mfr. Part No.2981428
HK$2,626.06
Each
units
24 V dc 2 - Light Beam/Curtain, Safety Switch/Interlock 6 - - 3 Screw - 114.5mm - 99mm 45mm
RS Stock No. 814-6933
Mfr. Part No.XPSAR311144P
HK$4,873.44
Each
units
24 V ac/dc 2 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 7 Preventa Monitored - Screw - 114mm - 99mm 90mm
RS Stock No. 123-2745
Mfr. Part No.280005
BrandIDEM
HK$2,724.09
Each
units
24 V ac/dc 2 3 Emergency Stop, Safety Switch/Interlock 7 Viper Automatic, Manual - Screw CULus, EN 60204-1, EN 62061, EN ISO 12100, EN ISO 13849-1, EN ISO 13849-2, TUV, UL 508 99mm - 45mm 111mm
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