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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Omschrijving Prijs 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-stocknr. 784-5780
Fabrikantnummer3SK1111-1AB30
FabrikantSiemens
€ 152,91
Each
Aantal stuks
24 V ac/dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 784-5881
Fabrikantnummer3SK1230-1AW20
FabrikantSiemens
€ 97,13
Each
Aantal stuks
110 → 240 V ac/dc - - - - - - - SIRIUS Automatic - Screw - -
RS-stocknr. 784-5800
Fabrikantnummer3SK1121-1AB40
FabrikantSiemens
€ 194,27
Each
Aantal stuks
24 V dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 784-5790
Fabrikantnummer3SK1112-1BB40
FabrikantSiemens
€ 121,57
Each
Aantal stuks
24 V dc 1 - - - - - - SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 411-2157
Fabrikantnummer3TK2827-1BB40
FabrikantSiemens
€ 450,00
Each
Aantal stuks
24 V dc 1 1 Safety Switch/Interlock, Speed/Standstill Monitoring - - - 2 SIRIUS Monitored - Screw - -
RS-stocknr. 784-5793
Fabrikantnummer3SK1111-2AB30
FabrikantSiemens
€ 152,91
Each
Aantal stuks
24 V ac/dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Cage Clamp - -
RS-stocknr. 498-937
Fabrikantnummer3RK1205-0BG00-0AA2
FabrikantSiemens
€ 104,00
Each
Aantal stuks
26.5 → 31.5 V dc - - - - - - 2 SIRIUS - - Cage Clamp - -
RS-stocknr. 528-0908
Fabrikantnummer3SE6806-2CD00
FabrikantSiemens
€ 440,00
Each
Aantal stuks
24 V dc 1 1 Safety Switch/Interlock - - - 2 SIRIUS Monitored - - - -
RS-stocknr. 784-5803
Fabrikantnummer3SK1121-1CB41
FabrikantSiemens
€ 243,15
Each
Aantal stuks
24 V dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 455-6535
Fabrikantnummer3TK2842-1BB42
FabrikantSiemens
€ 235,00
Each
Aantal stuks
24 V dc 1 - Safety Switch/Interlock - - - 1 SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 784-5807
Fabrikantnummer3SK1121-1CB42
FabrikantSiemens
€ 243,15
Each
Aantal stuks
24 V dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 784-5847
Fabrikantnummer3SK1122-2CB44
FabrikantSiemens
€ 146,01
Each
Aantal stuks
24 V dc 1 - - - - - - SIRIUS Automatic, Monitored - Cage Clamp - -
RS-stocknr. 784-5796
Fabrikantnummer3SK1111-2AW20
FabrikantSiemens
€ 152,91
Each
Aantal stuks
110 → 240 V ac/dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Cage Clamp - -
RS-stocknr. 183-7201
Fabrikantnummer3SK2122-2AA10
FabrikantSiemens
€ 703,00
Each
Aantal stuks
24 V dc 4 - - - - - - SIRIUS - PLe, SIL 3 Push In - -
RS-stocknr. 763-6864
Fabrikantnummer3TK2828-1AJ20
FabrikantSiemens
€ 463,00
Each
Aantal stuks
115 V ac 1, 2 - Safety Switch/Interlock, Speed/Standstill Monitoring - - - 4 SIRIUS - - - - -
RS-stocknr. 784-5784
Fabrikantnummer3SK1111-1AW20
FabrikantSiemens
€ 152,91
Each
Aantal stuks
110 → 240 V ac/dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 784-5829
Fabrikantnummer3SK1122-1CB41
FabrikantSiemens
€ 146,01
Each
Aantal stuks
24 V dc 1 - - - - - - SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 183-7202
Fabrikantnummer3SK2611-3AA00
FabrikantSiemens
€ 460,00
Each
Aantal stuks
- - - - - - - - SIRIUS - - Screw - -
RS-stocknr. 784-5819
Fabrikantnummer3SK1121-2AB40
FabrikantSiemens
€ 194,27
Each
Aantal stuks
24 V dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Cage Clamp - -
RS-stocknr. 183-7198
Fabrikantnummer3SK2112-1AA10
FabrikantSiemens
€ 478,00
Each
Aantal stuks
24 V dc 2 - - - - - - SIRIUS - PLe, SIL 3 Screw - -