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. 741-8666
Mfr. Part No.SRB324ST 24V (V.3)
BrandSchmersal
SGD708.36
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 45mm
RS Stock No. 741-8641
Mfr. Part No.SRB301AN 24VAC/DC
BrandSchmersal
SGD499.41
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 PROTECT - - - - 121mm - 100mm 22.5mm
RS Stock No. 741-8653
Mfr. Part No.SRB301ST-24V-(V.2)
BrandSchmersal
SGD470.38
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm
RS Stock No. 741-8650
Mfr. Part No.SRB 301MC-24V
BrandSchmersal
SGD365.93
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm
RS Stock No. 741-8669
Mfr. Part No.SRB202CA/QT 24VDC
BrandSchmersal
SGD654.59
Each
units
24 V dc 2 - Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm
RS Stock No. 146-5870
Mfr. Part No.SRB-E-402ST
BrandSchmersal
SGD570.23
Each
units
24 V dc 1, 2 1 - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 146-5864
Mfr. Part No.SRB-E-201ST
BrandSchmersal
SGD460.85
Each
units
24 V dc 1, 2 - - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 146-5868
Mfr. Part No.SRB-E-301ST
BrandSchmersal
SGD414.31
Each
units
24 V ac/dc 1, 2 1 - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 146-5869
Mfr. Part No.SRB-E-322ST
BrandSchmersal
SGD616.80
Each
units
24 V dc 1, 2 1 - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 741-8657
Mfr. Part No.SRB302X3-24VAC/DC-230VAC
BrandSchmersal
SGD432.49
Each
units
24 V ac/dc, 230 V ac 2 - Light Beam/Curtain, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 45mm
RS Stock No. 741-8635
Mfr. Part No.SRB201ZH-24VDC
BrandSchmersal
SGD491.53
Each
units
24 V dc 2 2 Safety Switch/Interlock 3 PROTECT - - - - 121mm - 100mm 22.5mm
RS Stock No. 146-5865
Mfr. Part No.SRB-E-204PE
BrandSchmersal
SGD246.70
Each
units
24 V dc 1, 2 - - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 146-5867
Mfr. Part No.SRB-E-212ST
BrandSchmersal
SGD473.32
Each
units
24 V dc 1, 2 - - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 146-5866
Mfr. Part No.SRB-E-204ST
BrandSchmersal
SGD460.85
Each
units
24 V dc 1, 2 - - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 698-8694
Mfr. Part No.SRB101EXI-1R
BrandSchmersal
SGD1,051.35
Each
units
24 V dc 2 1 Safety Switch/Interlock 1 PROTECT Monitored - Screw - 121mm ATEX 100mm 22.5mm
RS Stock No. 146-5863
Mfr. Part No.SRB-E-201LC
BrandSchmersal
SGD267.66
Each
units
24 V dc 1, 2 - - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 698-8704
Mfr. Part No.SRB101EXI-1A
BrandSchmersal
SGD1,089.76
Each
units
24 V dc 2 1 Safety Switch/Interlock 1 PROTECT Automatic, Manual - Screw - 121mm ATEX 100mm 22.5mm
RS Stock No. 741-8647
Mfr. Part No.SRB207AN 24V
BrandSchmersal
SGD561.11
Each
units
24 V dc - - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 45mm
RS Stock No. 698-8707
Mfr. Part No.SRB200EXI-1R
BrandSchmersal
SGD1,051.35
Each
units
24 V dc 2 - Safety Switch/Interlock 2 PROTECT Monitored - Screw - 121mm ATEX 100mm 22.5mm