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. 890-3389
Mfr. Part No.G9SE-201-DC24
BrandOmron
$190.20
Each
units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 - Automatic, Manual - Screw CAN C22.2 No.14, CSA C22.2 No.14, EN 62061 SIL3, EN 81-1, EN 81-2, EN ISO 13849-1: 2008 PL e Safety Category 4, EN/IEC 60947-5-1, GB 14048.5, IEC 62061 SIL 3, UL508 111.6mm - 144.5mm 17.5mm
RS Stock No. 549-609
Mfr. Part No.G9SA-301 24AC/DC
BrandOmron
$617.98
Each
units
24 V ac/dc 1, 2 1 Emergency Stop 3 - - - - - 111mm - 76mm 45mm
RS Stock No. 890-3382
Mfr. Part No.G9SE-401-DC24
BrandOmron
$231.87
Each
units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 - Automatic, Manual - Screw CAN C22.2 No.14, CSA C22.2 No.14, EN 62061 SIL3, EN 81-1, EN 81-2, EN ISO 13849-1: 2008 PL e Safety Category 4, EN/IEC 60947-5-1, GB 14048.5, IEC 62061 SIL 3, UL508 111.6mm - 144.5mm 22.5mm
RS Stock No. 836-2738
Mfr. Part No.G7SA5A1B24DC
BrandOmron
$80.63
Each
units
24 V dc - - - - - - - - - 24mm - 50mm 13mm
RS Stock No. 549-489
Mfr. Part No.G9SB301BACDC24
BrandOmron
$616.46
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - Automatic - - - 112mm - 100mm 23mm
RS Stock No. 549-546
Mfr. Part No.G9SA-321-T15 24AC/DC
BrandOmron
$565.47
Each
units
24 V ac/dc 1, 2 1 Emergency Stop 3 - - - - - 111mm - 76mm 45mm
RS Stock No. 757-9304
Mfr. Part No.G9SB-3012-A AC/DC24
BrandOmron
$616.46
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - - - - - 112mm - 100mm 23mm
RS Stock No. 757-9317
Mfr. Part No.G9SA-301 AC100-240
BrandOmron
$468.82
Each
units
100 240 V ac 2 1 Emergency Stop 1 - - - - - 111mm - 94mm 45mm
RS Stock No. 549-530
Mfr. Part No.G9SB-2002-A AC/DC24
BrandOmron
$303.24
Each
units
24 V ac/dc 2 - Emergency Stop 2 - Automatic - - - 112mm - 100mm 18mm
RS Stock No. 757-9301
Mfr. Part No.G9SB-3010 DC24
BrandOmron
$754.05
Each
units
24 V dc 2 1 Emergency Stop 3 - - - - - 112mm - 100mm 18mm
RS Stock No. 757-9308
Mfr. Part No.G9SB-3012-C AC/DC24
BrandOmron
$316.80
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - - - - - 112mm - 100mm 23mm
RS Stock No. 794-8814
Mfr. Part No.G7SA-5A1B DC24
BrandOmron
$88.70
Each
units
12 48 V dc 2 1 - 1 - Manual - PCB Pin - 24mm - 50mm 13mm
RS Stock No. 757-9310
Mfr. Part No.G9SA-321-T075 AC/DC24
BrandOmron
$565.78
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - - - - - 111mm - 94mm 45mm
RS Stock No. 757-9326
Mfr. Part No.G9SA-TH301 AC/DC24
BrandOmron
$453.36
Each
units
24 V ac/dc 2 1 Two-Hand Control 3 - - - - - 111mm - 94mm 45mm
RS Stock No. 860-3773
Mfr. Part No.G9SR-BC201-RC
BrandOmron
$226.78
Each
units
19.2 28.8 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - - Cage Clamp - 17.6mm - 114.5mm 99mm
RS Stock No. 757-9339
Mfr. Part No.G9SX-NS202-RT DC24
BrandOmron
$561.58
Each
units
24 V dc - - Safety Switch/Interlock - - - - Screw - 115mm - 100mm 23mm
RS Stock No. 549-536
Mfr. Part No.G9SA-501 24AC/DC
BrandOmron
$743.54
Each
units
24 V ac/dc 1, 2 1 Emergency Stop 5 - - - - - 111mm - 76mm 45mm
RS Stock No. 890-3386
Mfr. Part No.G9SE-221-T05-DC24
BrandOmron
$259.19
Each
units
24 V dc 2 1 Emergency Stop 2 - Automatic, Manual - Screw CAN C22.2 No.14, CSA C22.2 No.14, EN 62061 SIL3, EN 81-1, EN 81-2, EN ISO 13849-1: 2008 PL e Safety Category 4, EN/IEC 60947-5-1, GB 14048.5, IEC 62061 SIL 3, UL508 111.6mm - 144.5mm 22.5mm
RS Stock No. 757-9291
Mfr. Part No.G9SB-2002-C AC/DC24
BrandOmron
$677.59
Each
units
24 V ac/dc 2 - Emergency Stop 2 - - - - - 112mm - 100mm 18mm
RS Stock No. 860-3770
Mfr. Part No.G9SR-AD201-RC
BrandOmron
$260.79
Each
units
19.2 28.8 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 - - - Cage Clamp - 22.5mm - 114.5mm 99mm