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. 183-7198
Mfr. Part No.3SK2112-1AA10
BrandSiemens
$1,029.71
Each
units
24 V dc 2 - - - SIRIUS - PLe, SIL 3 Screw - 100mm - 22.5mm 124.5mm
RS Stock No. 206-5904
Mfr. Part No.103014308
$788.29
Each
units
24 V 2 1 - 3 - - - - - - - - -
RS Stock No. 201-1460
Mfr. Part No.XPSUAF33AP
$373.69
Each
units
48 → 230 V ac/dc 1 4 Emergency Stop 5 Preventa - PLe Category 4, SIL CL3 Screw CCC, CE, CULus, EAC, FS, Green Premium, K-Mark, RCM, REACH, RoHS, S-Mark 120mm - 100mm 22.5mm
RS Stock No. 181-2781
Mfr. Part No.UG6980.04PS/61 DC24V
BrandDold
$464.67
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
$303.58
Each
units
24 V dc 2 1 - 3 PNOZ s2 Automatic, Manual 4 Cage Clamp - 120mm - 98mm 17.5mm
RS Stock No. 757-9323
Mfr. Part No.G9SA-501 AC100-240
BrandOmron
$591.71
Each
units
100 → 240 V ac 2 1 Emergency Stop 5 - - - - - 111mm - 94mm 45mm
RS Stock No. 202-1668
Mfr. Part No.3SK1220-1AB40
BrandSiemens
$410.20
Each
units
24 V 1 - Safety Relay - - - - - - - - - -
RS Stock No. 324-7280
Mfr. Part No.774325
BrandPilz
$499.35
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 2 PNOZ X Automatic, Manual PLe Category 4 Screw - 121mm - 87mm 22.5mm
RS Stock No. 239-1061
Mfr. Part No.774314
BrandPilz
$595.81
Each
units
24 V dc, 110 V ac 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 712-5257
Mfr. Part No.2900526
$314.45
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 2 - - 3 Screw - 114.5mm - 112mm 22.5mm
RS Stock No. 794-8814
Mfr. Part No.G7SA-5A1B DC24
BrandOmron
$96.24
Each
units
12 → 48 V dc 2 1 - 1 - Manual - PCB Pin - 24mm - 50mm 13mm
RS Stock No. 609-7151
Mfr. Part No.XPSAC1321
$700.85
Each
units
48 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 146-5865
Mfr. Part No.SRB-E-204PE
BrandSchmersal
$336.64
Each
units
24 V dc 1, 2 - - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 784-5793
Mfr. Part No.3SK1111-2AB30
BrandSiemens
$551.90
Each
units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 191-9862
Mfr. Part No.751126
BrandPilz
$415.21
Each
units
24 V dc 2 1 - 3 PNOZ s6.1 Automatic 1, 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 201-5581
Mfr. Part No.2903254
$629.10
Each
units
24 V dc 4 None Emergency Stop, Safety Switch 3 - - - - - - - - -
New
RS Stock No. 207-2689
Mfr. Part No.2702522
$662.69
Each
units
24 V 1 1 Safety Switch 1 - - - - - - - - -
RS Stock No. 784-5829
Mfr. Part No.3SK1122-1CB41
BrandSiemens
$502.30
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 201-6245
Mfr. Part No.2902725
$629.10
Each
units
24 V dc 4 None Emergency Stop, Safety Switch 3 - - - - - - - - -
RS Stock No. 464-502
Mfr. Part No.XPSATE3410P
$891.03
Each
units
115 V ac 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 2 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm