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. 784-5807
Mfr. Part No.3SK1121-1CB42
BrandSiemens
$673.75
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 784-5803
Mfr. Part No.3SK1121-1CB41
BrandSiemens
$821.62
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 183-7198
Mfr. Part No.3SK2112-1AA10
BrandSiemens
$925.73
Each
units
24 V dc 2 - - - SIRIUS - PLe, SIL 3 Screw - 100mm - 22.5mm 124.5mm
RS Stock No. 784-5844
Mfr. Part No.3SK1122-2CB42
BrandSiemens
$333.92
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 183-7202
Mfr. Part No.3SK2611-3AA00
BrandSiemens
$880.82
Each
units
- - - - - SIRIUS - - Screw - 60mm - 96mm 41.9mm
RS Stock No. 784-5825
Mfr. Part No.3SK1121-2CB44
BrandSiemens
$788.01
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 183-7199
Mfr. Part No.3SK2112-2AA10
BrandSiemens
$915.26
Each
units
24 V dc 2 - - - SIRIUS - PLe, SIL 3 Push In - 100mm - 22.5mm 124.5mm
RS Stock No. 184-0136
Mfr. Part No.3SK29412AA10
BrandSiemens
$781.87
Each
units
- 2 - - - SIRIUS - 4, PLe 3, SIL 3 Plug In - 100mm - 22.5mm 124.5mm
RS Stock No. 784-5847
Mfr. Part No.3SK1122-2CB44
BrandSiemens
$317.96
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 784-5829
Mfr. Part No.3SK1122-1CB41
BrandSiemens
$317.96
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
New
RS Stock No. 197-3298
Mfr. Part No.3SK1911-3SB40
BrandSiemens
$607.98
Each
units
24 V - - Emergency Stop - - - - - - - - - -
RS Stock No. 784-5780
Mfr. Part No.3SK1111-1AB30
BrandSiemens
$548.41
Each
units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 784-5796
Mfr. Part No.3SK1111-2AW20
BrandSiemens
$350.30
Each
units
110 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 784-5838
Mfr. Part No.3SK1122-1CB42
BrandSiemens
$317.96
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 784-5800
Mfr. Part No.3SK1121-1AB40
BrandSiemens
$580.77
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 183-7201
Mfr. Part No.3SK2122-2AA10
BrandSiemens
$1,346.13
Each
units
24 V dc 4 - - - SIRIUS - PLe, SIL 3 Push In - 100mm - 45mm 124.5mm
New
RS Stock No. 197-3299
Mfr. Part No.3SK1912-3SB40
BrandSiemens
$1,624.65
Each
units
24 V - - Emergency Stop - - - - - - - - - -
RS Stock No. 784-5835
Mfr. Part No.3SK1122-2CB41
BrandSiemens
$321.82
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 183-7200
Mfr. Part No.3SK2122-1AA10
BrandSiemens
$1,346.13
Each
units
24 V dc 4 - - - SIRIUS - PLe, SIL 3 Screw - 100mm - 45mm 124.5mm
RS Stock No. 784-5784
Mfr. Part No.3SK1111-1AW20
BrandSiemens
$479.18
Each
units
110 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm