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. 836-2738
Mfr. Part No.G7SA5A1B24DC
BrandOmron
$72.64
Each
units
24 V dc - - - - - - - - - 24mm - 50mm 13mm
RS Stock No. 666-7078
Mfr. Part No.2981936
$197.91
Each
units
24 V dc - - Safety Switch/Interlock - - - - - - 106mm - 99mm 22.5mm
RS Stock No. 489-6350
Mfr. Part No.777302
BrandPilz
$628.85
Each
units
24 → 240 V ac/dc 1, 2 1 Safety Switch/Interlock 3 PNOZ X - - Screw - 121mm - 94mm 22.5mm
RS Stock No. 733-2391
Mfr. Part No.2TLA010029R0000
BrandABB
$393.14
Each
units
24 V dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 2 - - - Terminal Block - 120mm - 84mm 22.5mm
RS Stock No. 917-6664
Mfr. Part No.2TLA010033R2000
BrandABB
$271.93
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 4 - Automatic - Screw - 120mm - 84mm 22.5mm
RS Stock No. 666-7044
Mfr. Part No.2963802
$312.25
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock 4 - - 1 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 741-8650
Mfr. Part No.SRB 301MC-24V
BrandSchmersal
$474.29
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. 291-3201
Mfr. Part No.BG5924.48 AC/DC24V
BrandDold
$349.17
Each
units
24 V dc 1 - Emergency Stop 4 Safemaster - - - - 121mm - 84mm 22.5mm
RS Stock No. 239-1033
Mfr. Part No.774300
BrandPilz
$472.64
Each
units
24 V ac/dc 1 1 Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 22.5mm
RS Stock No. 245-1860
Mfr. Part No.774080
BrandPilz
$907.38
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 7 - Automatic, Manual, Monitored - Screw - 121mm - 87mm 90mm
RS Stock No. 239-1049
Mfr. Part No.774303
BrandPilz
$337.73
Each
units
24 V ac/dc 2 - Light Beam/Curtain, Safety Switch/Interlock 2 PNOZ X Manual - Screw - 121mm - 87mm 22.5mm
RS Stock No. 489-6388
Mfr. Part No.777606
BrandPilz
$835.00
Each
units
24 240 V ac/dc 1, 2 2 Safety Switch/Interlock 7 PNOZ X - - Screw - 121mm - 94mm 90mm
RS Stock No. 666-7050
Mfr. Part No.2963721
$406.73
Each
units
24 V ac/dc 2 1 Two-Hand Control 2 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 741-8641
Mfr. Part No.SRB301AN 24VAC/DC
BrandSchmersal
$762.88
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. 733-2418
Mfr. Part No.2TLA010002R0000
BrandABB
$570.92
Each
units
24 V dc 2 - Two-Hand Control 4 - - - Screw - 120mm - 74mm 45mm
RS Stock No. 271-502
Mfr. Part No.UE10-3OS3D0
BrandSick
$286.58
Each
units
24 V dc - - - - - - - - - - - - -
RS Stock No. 203-8063
Mfr. Part No.774030
BrandPilz
$423.48
Each
units
24 V dc 1 2 Speed/Standstill Monitoring 1 PNOZ X - - Screw - 121mm - 87mm 45mm
RS Stock No. 515-1759
Mfr. Part No.R1.188.0500.1
BrandWieland
$255.50
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 3 safeRELAY Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 327-7613
Mfr. Part No.BH5928.92 DC24V 1-10S
BrandDold
$618.06
Each
units
24 V ac/dc 1, 2 - Emergency Stop 3 Safemaster - - - - 118mm - 84mm 45mm
RS Stock No. 712-5260
Mfr. Part No.2986960
$330.19
Each
units
24 V dc - - - 3 - - 3 Screw - 114.5mm - 99mm 17.5mm
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