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 Category ISO 13849-1 SIL IEC 61508 PL ISO 13849-1 Safety Contacts Range Reset Method Safety Category Terminal Type Standards Met Configurable
RS庫存編號 698-8704
製造零件編號SRB101EXI-1A
BrandSchmersal
HK$5,108.23
單位
24 V dc 2 1 Safety Switch/Interlock 4 3 E 1 PROTECT Automatic, Manual - Screw - -
RS庫存編號 698-8707
製造零件編號SRB200EXI-1R
BrandSchmersal
HK$4,928.18
單位
24 V dc 2 - Safety Switch/Interlock 4 3 E 2 PROTECT Monitored - Screw - -
RS庫存編號 741-8653
製造零件編號SRB301ST-24V-(V.2)
BrandSchmersal
HK$2,268.36
單位
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 3 E - PROTECT - - Screw - -
RS庫存編號 741-8666
製造零件編號SRB324ST 24V (V.3)
BrandSchmersal
HK$3,284.74
單位
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Switch/Interlock 3 2 D - PROTECT - - Screw - -
RS庫存編號 146-5865
製造零件編號SRB-E-204PE
BrandSchmersal
HK$1,426.67
單位
24 V dc 1, 2 - - 1 - E - - Automatic - Plug In, Screw - -
RS庫存編號 146-5869
製造零件編號SRB-E-322ST
BrandSchmersal
HK$3,566.81
單位
24 V dc 1, 2 1 - 1 - E - - Automatic - Plug In, Screw - -
RS庫存編號 741-8650
製造零件編號SRB 301MC-24V
BrandSchmersal
HK$1,566.37
單位
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 3 E - PROTECT - - Screw - -
RS庫存編號 741-8669
製造零件編號SRB202CA/QT 24VDC
BrandSchmersal
HK$3,038.91
單位
24 V dc 2 - Safety Switch/Interlock 4 3 E - PROTECT - - Screw - -
RS庫存編號 741-8657
製造零件編號SRB302X3-24VAC/DC-230VAC
BrandSchmersal
HK$2,038.26
單位
24 V ac/dc, 230 V ac 2 - Light Beam/Curtain, Safety Switch/Interlock 4 3 E - PROTECT - - Screw - -
RS庫存編號 146-5863
製造零件編號SRB-E-201LC
BrandSchmersal
HK$1,547.86
單位
24 V dc 1, 2 - - 1 - E - - Automatic - Plug In, Screw - -
RS庫存編號 146-5868
製造零件編號SRB-E-301ST
BrandSchmersal
HK$2,395.90
單位
24 V ac/dc 1, 2 1 - 1 - E - - Automatic - Plug In, Screw - -
RS庫存編號 741-8641
製造零件編號SRB301AN 24VAC/DC
BrandSchmersal
HK$2,315.79
單位
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 3 E 4 PROTECT - - - - -
RS庫存編號 146-5867
製造零件編號SRB-E-212ST
BrandSchmersal
HK$2,894.99
單位
24 V dc 1, 2 - - 1 - E - - Automatic - Plug In, Screw - -
RS庫存編號 698-8694
製造零件編號SRB101EXI-1R
BrandSchmersal
HK$4,567.22
單位
24 V dc 2 1 Safety Switch/Interlock 4 3 E 1 PROTECT Monitored - Screw - -
RS庫存編號 741-8647
製造零件編號SRB207AN 24V
BrandSchmersal
HK$2,621.72
單位
24 V dc - - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 2 E - PROTECT - - Screw - -
RS庫存編號 741-8635
製造零件編號SRB201ZH-24VDC
BrandSchmersal
HK$2,281.80
單位
24 V dc 2 2 Safety Switch/Interlock 4 3 E 3 PROTECT - - - - -
RS庫存編號 146-5864
製造零件編號SRB-E-201ST
BrandSchmersal
HK$2,531.81
單位
24 V dc 1, 2 - - 1 - E - - Automatic - Plug In, Screw - -
RS庫存編號 146-5866
製造零件編號SRB-E-204ST
BrandSchmersal
HK$2,665.06
單位
24 V dc 1, 2 - - 1 - E - - Automatic - Plug In, Screw - -
RS庫存編號 146-5870
製造零件編號SRB-E-402ST
BrandSchmersal
HK$3,132.64
單位
24 V dc 1, 2 1 - 1 - E - - Automatic - Plug In, Screw - -