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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Beskrivning Pris Supply Voltage Number of Channels Auxiliary Contacts Function Safety Category ISO 13849-1 SIL IEC 61508 PL ISO 13849-1 Safety Contacts Range Reset Method Safety Category Terminal Type Standards Met Configurable
RS-artikelnummer 784-5780
Tillv. art.nr3SK1111-1AB30
VarumärkeSiemens
2 751,31 kr
Each
Enheter
24 V ac/dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
RS-artikelnummer 498-937
Tillv. art.nr3RK1205-0BG00-0AA2
VarumärkeSiemens
1 684,91 kr
Each
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26.5 → 31.5 V dc - - - - - - 2 SIRIUS - - Cage Clamp - -
RS-artikelnummer 184-0136
Tillv. art.nr3SK29412AA10
VarumärkeSiemens
3 759,17 kr
Each
Enheter
- 2 - - - - - - SIRIUS - PLe 3, SIL 3, 4 Plug In - -
RS-artikelnummer 202-1667
Tillv. art.nr3SK1112-2BB40
VarumärkeSiemens
2 186,12 kr
Each
Enheter
24 V 1 - Safety Relay - - - 2 - - - - - -
RS-artikelnummer 197-3298
Tillv. art.nr3SK1911-3SB40
VarumärkeSiemens
3 273,85 kr
Each
Enheter
24 V 2 None Emergency Stop - - - - Sirius Safety - - - - -
RS-artikelnummer 784-5803
Tillv. art.nr3SK1121-1CB41
VarumärkeSiemens
4 372,24 kr
Each
Enheter
24 V dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
Nytt
RS-artikelnummer 211-9560
Tillv. art.nr3TK2810-1BA41
VarumärkeSiemens
18 676,05 kr
Each
Enheter
24 V 2 1 - - - - 2 - - - - - -
RS-artikelnummer 784-5793
Tillv. art.nr3SK1111-2AB30
VarumärkeSiemens
2 751,31 kr
Each
Enheter
24 V ac/dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Cage Clamp - -
Nytt
RS-artikelnummer 211-9558
Tillv. art.nr3SK1120-2AB40
VarumärkeSiemens
2 272,05 kr
Each
Enheter
24 V 2 1 - - - - 1 - - - - - -
Nytt
RS-artikelnummer 211-0166
Tillv. art.nr3SK1230-2AW20
VarumärkeSiemens
1 891,40 kr
Each
Enheter
240 V - - Safety Switch - - - - - - - - - -
RS-artikelnummer 784-5822
Tillv. art.nr3SK1121-2CB42
VarumärkeSiemens
4 372,24 kr
Each
Enheter
24 V dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Cage Clamp - -
Nytt
RS-artikelnummer 211-8958
Tillv. art.nr3RK1105-1BE04-0CA0
VarumärkeSiemens
6 732,90 kr
Each
Enheter
250 V 2 - - - - - - - - - - - -
RS-artikelnummer 183-7200
Tillv. art.nr3SK2122-1AA10
VarumärkeSiemens
7 923,35 kr
Each
Enheter
24 V dc 4 - - - - - - SIRIUS - PLe, SIL 3 Screw - -
RS-artikelnummer 202-1665
Tillv. art.nr3SK1122-1AB40
VarumärkeSiemens
2 623,34 kr
Each
Enheter
24 V 1 - Safety Relay - - - 3 - - - - - -
RS-artikelnummer 784-5800
Tillv. art.nr3SK1121-1AB40
VarumärkeSiemens
3 497,79 kr
Each
Enheter
24 V dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
RS-artikelnummer 784-5790
Tillv. art.nr3SK1112-1BB40
VarumärkeSiemens
2 186,12 kr
Each
Enheter
24 V dc 1 - - - - - - SIRIUS Automatic, Monitored - Screw - -
RS-artikelnummer 197-3299
Tillv. art.nr3SK1912-3SB40
VarumärkeSiemens
8 755,14 kr
Each
Enheter
24 V - None Emergency Stop - - - - Sirius Safety - - - - -
RS-artikelnummer 784-5796
Tillv. art.nr3SK1111-2AW20
VarumärkeSiemens
2 751,31 kr
Each
Enheter
110 to 240 V ac/dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Cage Clamp - -
RS-artikelnummer 784-5835
Tillv. art.nr3SK1122-2CB41
VarumärkeSiemens
2 623,34 kr
Each
Enheter
24 V dc 1 - - - - - - SIRIUS Automatic, Monitored - Cage Clamp - -
RS-artikelnummer 183-7198
Tillv. art.nr3SK2112-1AA10
VarumärkeSiemens
5 385,32 kr
Each
Enheter
24 V dc 2 - - - - - - SIRIUS - PLe, SIL 3 Screw - -