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 Series
RS Stock No. 528-0908
Mfr. Part No.3SE6806-2CD00
BrandSiemens
$772.32
Each
units
24 V dc 1 1 Safety Switch/Interlock 2 SIRIUS Monitored - - - 120mm - 100mm -
RS Stock No. 411-2157
Mfr. Part No.3TK2827-1BB40
BrandSiemens
$950.06
Each
units
24 V dc 1 1 Safety Switch/Interlock, Speed/Standstill Monitoring 2 SIRIUS Monitored - Screw - 120mm - 138.5mm -
RS Stock No. 784-5800
Mfr. Part No.3SK1121-1AB40
BrandSiemens
$523.22
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm -
RS Stock No. 784-5803
Mfr. Part No.3SK1121-1CB41
BrandSiemens
$740.20
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm -
RS Stock No. 784-5793
Mfr. Part No.3SK1111-2AB30
BrandSiemens
$382.86
Each
units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm -
RS Stock No. 784-5780
Mfr. Part No.3SK1111-1AB30
BrandSiemens
$494.06
Each
units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm -
RS Stock No. 498-937
Mfr. Part No.3RK1205-0BG00-0AA2
BrandSiemens
$211.67
Each
units
26.5 → 31.5 V dc - - - 2 SIRIUS - - Cage Clamp - 91mm - 90mm -
RS Stock No. 784-5881
Mfr. Part No.3SK1230-1AW20
BrandSiemens
$242.44
Each
units
110 → 240 V ac/dc - - - - SIRIUS Automatic - Screw - 121.7mm - 100mm -
RS Stock No. 784-5822
Mfr. Part No.3SK1121-2CB42
BrandSiemens
$638.57
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm -
RS Stock No. 784-5807
Mfr. Part No.3SK1121-1CB42
BrandSiemens
$606.98
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm -
RS Stock No. 784-5790
Mfr. Part No.3SK1112-1BB40
BrandSiemens
$343.20
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 91.7mm - 100mm -
RS Stock No. 784-5816
Mfr. Part No.3SK1121-1CB44
BrandSiemens
$606.98
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm -
RS Stock No. 784-5784
Mfr. Part No.3SK1111-1AW20
BrandSiemens
$431.69
Each
units
110 → 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm -
RS Stock No. 763-6864
Mfr. Part No.3TK2828-1AJ20
BrandSiemens
$759.19
Each
units
115 V ac 1, 2 - Safety Switch/Interlock, Speed/Standstill Monitoring 4 SIRIUS - - - - 120mm - 138.5mm -
RS Stock No. 784-5796
Mfr. Part No.3SK1111-2AW20
BrandSiemens
$315.59
Each
units
110 → 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm -
RS Stock No. 498-949
Mfr. Part No.3TK2826-1BB40
BrandSiemens
$568.79
Each
units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 SIRIUS Automatic - Screw - 120mm - 138.5mm -
RS Stock No. 455-6535
Mfr. Part No.3TK2842-1BB42
BrandSiemens
$385.56
Each
units
24 V dc 1 - Safety Switch/Interlock 1 SIRIUS Automatic, Monitored - Screw - 88mm - 100mm -
RS Stock No. 784-5825
Mfr. Part No.3SK1121-2CB44
BrandSiemens
$709.92
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm -
RS Stock No. 183-7199
Mfr. Part No.3SK2112-2AA10
BrandSiemens
$824.56
Each
units
24 V dc 2 - - - SIRIUS - PLe, SIL 3 Push In - 100mm - 22.5mm -
RS Stock No. 784-5829
Mfr. Part No.3SK1122-1CB41
BrandSiemens
$286.45
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm -