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. 917-6664
Mfr. Part No.2TLA010033R2000
BrandABB
$299.12
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 4 - Automatic - Screw - 120mm - 84mm 22.5mm
RS Stock No. 146-5869
Mfr. Part No.SRB-E-322ST
BrandSchmersal
$805.63
Each
units
24 V dc 1, 2 1 - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 198-582
Mfr. Part No.XPSAR351144P
$1,003.51
Each
units
115 V ac 2 2 Emergency Stop, Light Beam/Curtain 7 Preventa Automatic, Manual - Screw - 114mm - 99mm 90mm
New
RS Stock No. 191-9865
Mfr. Part No.751135
BrandPilz
$626.42
Each
units
48 → 240 V ac/dc 2 - - 2 PNOZ s5 Automatic, Manual 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 784-5796
Mfr. Part No.3SK1111-2AW20
BrandSiemens
$347.15
Each
units
110 → 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 123-2737
Mfr. Part No.280002-P
BrandIDEM
$314.37
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 3 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 - 22.5mm 114mm
RS Stock No. 203-8035
Mfr. Part No.774073
BrandPilz
$435.51
Each
units
24 V dc, 110 V ac 2 - Safety Switch/Interlock 2 - Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 712-5260
Mfr. Part No.2986960
$363.21
Each
units
24 V dc - - - 3 - - 3 Screw - 114.5mm - 99mm 17.5mm
RS Stock No. 464-491
Mfr. Part No.XPSATE5110P
$896.40
Each
units
24 V dc 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 2 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 812-8957
Mfr. Part No.ESR5-NO-21-24VAC-DC
BrandEaton
$496.64
Each
units
- 2 - Emergency Stop, Safety Switch/Interlock 2 - Automatic, Manual - Screw - 99mm - 22.5mm 114.5mm
RS Stock No. 422-5180
Mfr. Part No.XPSAK371144
$552.99
Each
units
230 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 125-1103
Mfr. Part No.XPSTSA5142P
$416.96
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. 176-0033
Mfr. Part No.2TLA010050R0000
BrandABB Jokab
$324.84
Each
units
24 V dc 3 3NO/NC Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 447-4461
Mfr. Part No.XPSMP11123
$1,020.00
Each
units
24 V dc 1 3 Safety Mat/Edge, Safety Switch/Interlock 6 Preventa Automatic, Monitored - - - 114mm - 99mm 45mm
RS Stock No. 156-112
Mfr. Part No.750134
BrandPilz
$698.72
Each
units
48 → 240 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZsigma Automatic, Manual, Monitored - Screw - 120mm - 102mm 22.5mm
RS Stock No. 784-5822
Mfr. Part No.3SK1121-2CB42
BrandSiemens
$702.43
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 893-7723
Mfr. Part No.2904952
$294.62
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. 122-2492
Mfr. Part No.R1.188.2070.0
BrandWieland
$630.75
Each
units
24 V dc 2 - Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 7 safeRELAY Automatic, Manual, Monitored - Screw CCC, CPT, cULus, EN 50156-1, EN 62061, EN ISO 13849-1, FS, GL, GOST R, TUV 96.5mm - 45mm 114mm
RS Stock No. 177-4034
Mfr. Part No.2700525
$620.03
Each
units
24 → 230 V ac/dc 2 - Emergency Stop 3 - Manual 2 Terminal Block - 114.5mm - 117.4mm 22.5mm
RS Stock No. 784-5803
Mfr. Part No.3SK1121-1CB41
BrandSiemens
$814.22
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
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