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 Series
RS Stock No. 498-949
Mfr. Part No.3TK2826-1BB40
BrandSiemens
$625.67
Each
units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 SIRIUS Automatic - Screw - 120mm - 138.5mm -
RS Stock No. 893-7742
Mfr. Part No.2904957
$160.41
Each
units
24 V dc 2 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Manual - Screw CUL, CULus, EAC, Functional Safety, UL 102.5mm - 6.8mm -
RS Stock No. 447-4499
Mfr. Part No.XPSAC3721
$615.98
Each
units
230 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm -
RS Stock No. 549-489
Mfr. Part No.G9SB301BACDC24
BrandOmron
$284.54
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - Automatic - - - 112mm - 100mm -
RS Stock No. 666-7056
Mfr. Part No.2981800
$278.33
Each
units
24 V dc 2 2 Light Beam/Curtain, Safety Switch/Interlock 2 - - 3 Screw - 114.5mm - 99mm -
RS Stock No. 836-2738
Mfr. Part No.G7SA5A1B24DC
BrandOmron
$77.95
Each
units
24 V dc - - - - - - - - - 24mm - 50mm -
RS Stock No. 245-1860
Mfr. Part No.774080
BrandPilz
$998.12
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 7 - Automatic, Manual, Monitored - Screw - 121mm - 87mm -
RS Stock No. 240-8670
Mfr. Part No.BN5983.53 DC24V
BrandDold
$698.66
Each
units
24 V dc 2 1 Emergency Stop 3 Safemaster Monitored - Terminal Block - 121mm - 74mm -
RS Stock No. 890-3382
Mfr. Part No.G9SE-401-DC24
BrandOmron
$229.77
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 -
RS Stock No. 733-2391
Mfr. Part No.2TLA010029R0000
BrandABB
$426.14
Each
units
24 V dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 2 - - - Terminal Block - 120mm - 84mm -
RS Stock No. 917-6676
Mfr. Part No.2TLA010005R0100
BrandABB
$350.64
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock 3 - Automatic - Screw - 99mm - 82mm -
RS Stock No. 780-5098
Mfr. Part No.R1.188.3700.0 - SNZ1022K-A
BrandWieland
$172.62
Each
units
24 V dc 2 - - 2 SafeRELAY - - Screw - - - - -
RS Stock No. 123-2743
Mfr. Part No.280001
BrandIDEM
$166.93
Each
units
24 V ac/dc 1 1 Emergency Stop 3 Viper Automatic - Screw CULus, EN 60204-1, EN 62061, EN ISO 12100, EN ISO 13849-1, EN ISO 13849-2, TUV, UL 508 99mm - 22.5mm -
RS Stock No. 271-502
Mfr. Part No.UE10-3OS3D0
BrandSick
$213.18
Each
units
24 V dc - - - - - - - - - - - - UE10
RS Stock No. 477-3847
Mfr. Part No.XPSAV11113
$805.04
Each
units
24 V 1, 2 - Emergency Stop 3 Preventa - - - - 114mm - 99mm -
RS Stock No. 178-2438
Mfr. Part No.775600
BrandPilz
$389.79
Each
units
24 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Manual - Screw - 121mm - 87mm -
RS Stock No. 918-6686
Mfr. Part No.777301
BrandPilz
$515.21
Each
units
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm -
RS Stock No. 489-6394
Mfr. Part No.777949
BrandPilz
$1,636.11
Each
units
24 → 240 V ac/dc 1, 2 1 Speed/Standstill Monitoring 2 PNOZ X - - Screw - 121mm - 94mm -
RS Stock No. 701-9212
Mfr. Part No.UE10-2FG2D0
BrandSick
$162.69
Each
units
24 V dc 1, 2 - Light Beam/Curtain 3 - - - Screw - 70.8mm - 89.8mm -
RS Stock No. 447-4483
Mfr. Part No.XPSAC3421
$320.18
Each
units
115 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm -
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