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. 784-5784
Mfr. Part No.3SK1111-1AW20
BrandSiemens
$517.17
Each
units
110 → 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 784-5831
Mfr. Part No.3SK1122-1CB44
BrandSiemens
$330.91
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 814-6921
Mfr. Part No.XPSAFL5130P
$793.16
Each
units
24 V ac/dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 Preventa Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 893-7688
Mfr. Part No.2700466
$241.34
Each
units
24 V dc 1 3 Emergency Stop, Safety Switch/Interlock 3 PSRmini Automatic, Manual 1 Screw CUL, CULus, EAC, Functional Safety, UL 114.5mm - 112.2mm 12.5mm
RS Stock No. 155-844
Mfr. Part No.750106
BrandPilz
$786.49
Each
units
24 V dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm
RS Stock No. 814-6930
Mfr. Part No.XPSAK311144P
$1,163.61
Each
units
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Monitored - Screw - 114mm - 99mm 45mm
RS Stock No. 180-6091
Mfr. Part No.1085345 | RLY3-EMSS1
BrandSick
$330.00
Each
units
30 V dc 2 - - 2 - Automatic, Manual Cat 4 Plug In - 124.6mm - 18mm 85.5mm
New
RS Stock No. 201-5729
Mfr. Part No.2700581
$420.38
Each
units
24 V dc 2 None Safety Switch 2 - - - - - - - - -
RS Stock No. 190-8414
Mfr. Part No.2702902
$543.68
Each
units
24 V dc 2 - - 2 - Automatic, Manual, Monitored PLe Category 4, SILCL 3 Plug-In - 116.6mm - 17.5mm 114.5mm
RS Stock No. 197-3298
Mfr. Part No.3SK1911-3SB40
BrandSiemens
$606.96
Each
units
24 V - - Emergency Stop - Sirius Safety - - - - - - - -
RS Stock No. 784-5800
Mfr. Part No.3SK1121-1AB40
BrandSiemens
$657.28
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 324-7252
Mfr. Part No.774053
BrandPilz
$447.30
Each
units
110 V ac 1 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 860-3773
Mfr. Part No.G9SR-BC201-RC
BrandOmron
$238.14
Each
units
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - - Cage Clamp - 17.6mm - 114.5mm 99mm
RS Stock No. 177-9023
Mfr. Part No.SCR4-W22-2.6-D2H
$324.18
Each
units
24 V dc, 230 V ac 1 2NO/NC Two-Hand Control - - - - Screw - 114.5mm - 22.5mm 99mm
RS Stock No. 125-1101
Mfr. Part No.XPSPVT1180
$1,673.99
Each
units
24 V dc - - Emergency Stop, Safety Switch/Interlock 3 Preventa Manual PLe Category 4, SIL CL3 Screw CSA, TUV, UL - - - -
New
RS Stock No. 201-1482
Mfr. Part No.XPSUAK12AC
$395.03
Each
units
24 V ac/dc 1 4 Emergency Stop 5 - - - - - - - - -
RS Stock No. 181-1416
Mfr. Part No.XPSATE5110P
$1,058.65
Each
units
100 - 120 V, 200 - 240 V - - - - - - - - - - - - -
RS Stock No. 123-2736
Mfr. Part No.280001-P
BrandIDEM
$292.33
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
RS Stock No. 240-8715
Mfr. Part No.BO 5988.61/024 DC24V + AC230V
BrandDold
$601.51
Each
units
24 V dc, 230 V ac 2 1 - 6 Safemaster Monitored - Terminal Block - 121mm - 74mm 100mm
RS Stock No. 784-5816
Mfr. Part No.3SK1121-1CB44
BrandSiemens
$822.11
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
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