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庫存編號 784-5835
製造零件編號3SK1122-2CB41
BrandSiemens
HK$2,578.31
單位
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS庫存編號 784-5838
製造零件編號3SK1122-1CB42
BrandSiemens
HK$2,578.31
單位
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS庫存編號 202-1665
製造零件編號3SK1122-1AB40
BrandSiemens
HK$2,642.76
單位
24 V 1 - Safety Relay 3 - - - - - - - - -
RS庫存編號 784-5790
製造零件編號3SK1112-1BB40
BrandSiemens
HK$2,148.59
單位
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 91.7mm - 100mm 22.5mm
RS庫存編號 784-5881
製造零件編號3SK1230-1AW20
BrandSiemens
HK$1,708.13
單位
110 → 240 V ac/dc - - - - SIRIUS Automatic - Screw - 121.7mm - 100mm 22.5mm
RS庫存編號 784-5829
製造零件編號3SK1122-1CB41
BrandSiemens
HK$2,578.31
單位
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS庫存編號 184-0136
製造零件編號3SK29412AA10
BrandSiemens
HK$3,786.99
單位
- 2 - - - SIRIUS - PLe 3, SIL 3, 4 Plug In - 100mm - 22.5mm 124.5mm
RS庫存編號 784-5803
製造零件編號3SK1121-1CB41
BrandSiemens
HK$4,286.43
單位
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
全新
RS庫存編號 211-8959
製造零件編號3RK1105-1BE04-2CA0
BrandSiemens
HK$8,317.02
單位
250 2 - - - - - - - - - - - -
RS庫存編號 784-5831
製造零件編號3SK1122-1CB44
BrandSiemens
HK$1,477.48
單位
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS庫存編號 183-7199
製造零件編號3SK2112-2AA10
BrandSiemens
HK$5,285.53
單位
24 V dc 2 - - - SIRIUS - PLe, SIL 3 Push In - 100mm - 22.5mm 124.5mm
RS庫存編號 784-5784
製造零件編號3SK1111-1AW20
BrandSiemens
HK$2,696.48
單位
110 → 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS庫存編號 784-5822
製造零件編號3SK1121-2CB42
BrandSiemens
HK$4,286.43
單位
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS庫存編號 202-1666
製造零件編號3SK1122-2AB40
BrandSiemens
HK$2,642.76
單位
24 V 1 - Safety Relay 3 - - - - - - - - -
全新
RS庫存編號 211-9560
製造零件編號3TK2810-1BA41
BrandSiemens
HK$16,866.42
單位
24 V 2 1 - 2 - - - - - - - - -
RS庫存編號 784-5793
製造零件編號3SK1111-2AB30
BrandSiemens
HK$2,696.48
單位
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS庫存編號 784-5844
製造零件編號3SK1122-2CB42
BrandSiemens
HK$2,578.31
單位
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS庫存編號 784-5816
製造零件編號3SK1121-1CB44
BrandSiemens
HK$4,286.43
單位
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS庫存編號 183-7202
製造零件編號3SK2611-3AA00
BrandSiemens
HK$5,081.41
單位
- - - - - SIRIUS - - Screw - 60mm - 96mm 41.9mm
RS庫存編號 784-5800
製造零件編號3SK1121-1AB40
BrandSiemens
HK$3,427.00
單位
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm