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. 198-582
Mfr. Part No.XPSAR351144P
$1,702.07
Each
units
115 V ac 2 2 Emergency Stop, Light Beam/Curtain 7 Preventa Automatic, Manual - Screw - 114mm - 99mm 90mm
RS Stock No. 814-6949
Mfr. Part No.XPSDME1132P
$1,425.60
Each
units
24 V dc 1 2 Safety Switch/Interlock 2 Preventa Monitored - Screw - 114mm - 99mm 45mm
RS Stock No. 731-8951
Mfr. Part No.XPSBCE3110P
$1,733.82
Each
units
24 V ac/dc - 1 Two-Hand Control 2 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 757-9323
Mfr. Part No.G9SA-501 AC100-240
BrandOmron
$733.55
Each
units
100 → 240 V ac 2 1 Emergency Stop 5 - - - - - 111mm - 94mm 45mm
RS Stock No. 784-5816
Mfr. Part No.3SK1121-1CB44
BrandSiemens
$809.96
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 375-3779
Mfr. Part No.BG5933.22 AC24V
BrandDold
$445.10
Each
units
24 V ac - - Two-Hand Control 3 Safemaster - - - - 118mm - 84mm 22.5mm
New
RS Stock No. 201-5582
Mfr. Part No.2903259
$653.75
Each
units
24 V dc 4 None Emergency Stop, Safety Switch 3 - - - - - - - - -
New
RS Stock No. 200-6137
Mfr. Part No.XPSUDN13AP
$715.36
Each
units
24 V 6 - Emergency Stop Acti9 - - - - - - - - -
New
RS Stock No. 201-1467
Mfr. Part No.XPSUAT33A3AC
$787.64
Each
units
24 V ac/dc 1 8 Emergency Stop 5 - - - - - - - - -
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. 757-9320
Mfr. Part No.G9SX-GS226-T15-RT DC24
BrandOmron
$997.15
Each
units
24 V dc 2 - Safety Switch/Interlock - - - - Screw - 115mm - 100mm 45.5mm
RS Stock No. 918-6645
Mfr. Part No.777313
BrandPilz
$664.22
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
New
RS Stock No. 201-1466
Mfr. Part No.XPSUAT13A3AC
$717.79
Each
units
24 V ac/dc 1 8 Emergency Stop 5 - - - - - - - - -
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. 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. 122-2491
Mfr. Part No.R1.188.1830.0
BrandWieland
$369.41
Each
units
115 → 120 V ac 2 1 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 SafeRELAY Manual - Screw CCC, CPT, CULus, EN 50156-1, EN 61511, EN 62061, EN 81-1, EN ISO 13849-1, FS, GL, GOST R, TUV 96.5mm - 22.5mm 114mm
RS Stock No. 784-5835
Mfr. Part No.3SK1122-2CB41
BrandSiemens
$487.19
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 181-2781
Mfr. Part No.UG6980.04PS/61 DC24V
BrandDold
$526.62
Each
units
24 V dc 2 - - 4 - Auto Start, Manual PL e 4, SIL 3, 4 Screw - 110mm - 22.5mm 120.3mm
RS Stock No. 191-9853
Mfr. Part No.751102
BrandPilz
$397.06
Each
units
24 V dc 2 1 - 3 PNOZ s2 Automatic, Manual 4 Cage Clamp - 120mm - 98mm 17.5mm
RS Stock No. 784-5844
Mfr. Part No.3SK1122-2CB42
BrandSiemens
$487.19
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
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