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. 239-1083
Mfr. Part No.774340
BrandPilz
MYR2,623.82
Each
units
24 V dc 1, 2 1 Two-Hand Control 3 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 666-7044
Mfr. Part No.2963802
MYR615.06
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock 4 - - 1 Screw - 114.5mm - 99mm -
RS Stock No. 801-5873
Mfr. Part No.2901422
MYR1,473.43
Each
units
120 V ac/dc 2 - Safety Switch/Interlock 4 - Automatic, Manual 3 Cage Clamp - 114.5mm - 99mm -
RS Stock No. 918-6645
Mfr. Part No.777313
BrandPilz
MYR1,200.52
Each
units
24 → 240 V V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm -
RS Stock No. 291-3201
Mfr. Part No.BG5924.48 AC/DC24V
BrandDold
MYR875.70
Each
units
24 V dc 1 - Emergency Stop 4 Safemaster - - - - 121mm - 84mm -
RS Stock No. 492-5054
Mfr. Part No.UE48-2OS3D2
BrandSick
MYR889.46
Each
units
24 V ac/dc 1, 2 1 Light Beam/Curtain 2 - - - - - 114mm - 96.5mm -
RS Stock No. 362-0152
Mfr. Part No.774709
BrandPilz
MYR2,050.92
Each
units
24 V dc 1, 2 4 Safety Switch/Interlock 6 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 666-7078
Mfr. Part No.2981936
MYR752.29
Each
units
24 V dc - - Safety Switch/Interlock - - - - - - 106mm - 99mm -
RS Stock No. 701-9212
Mfr. Part No.UE10-2FG2D0
BrandSick
MYR352.66
Each
units
24 V dc 1, 2 - Light Beam/Curtain 3 - - - Screw - 70.8mm - 89.8mm -
RS Stock No. 464-491
Mfr. Part No.XPSATE5110P
MYR2,557.03
Each
units
24 V dc 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 2 Preventa Automatic, Manual - Screw - 114mm - 99mm -
RS Stock No. 733-2351
Mfr. Part No.2TLA010026R0500
BrandABB
MYR1,082.51
Each
units
230 V ac 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 - - - Terminal Block - 120mm - 84mm -
RS Stock No. 122-2493
Mfr. Part No.R1.188.1840.0
BrandWieland
MYR1,047.07
Each
units
230 V ac 2 1 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 SafeRELAY Manual - Screw CCC, CPT, CULus, EN 50156-1, EN 61511, EN 62061, EN 81-1, EN ISO 13849-1, FS, GL, GOST R, TUV 96.5mm - 22.5mm -
RS Stock No. 836-2738
Mfr. Part No.G7SA5A1B24DC
BrandOmron
MYR177.01
Each
units
24 V dc - - - - - - - - - 24mm - 50mm -
RS Stock No. 240-8670
Mfr. Part No.BN5983.53 DC24V
BrandDold
MYR1,646.21
Each
units
24 V dc 2 1 Emergency Stop 3 Safemaster Monitored - Terminal Block - 121mm - 74mm -
RS Stock No. 447-4534
Mfr. Part No.XPSDMB1132
MYR1,351.57
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock 2 Preventa - - Screw - 114mm - 22.5mm -
RS Stock No. 481-8237
Mfr. Part No.XPSAK351144
MYR1,124.73
Each
units
120 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm -
RS Stock No. 918-6649
Mfr. Part No.777512
BrandPilz
MYR1,801.78
Each
units
24 V dc 2 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm -
RS Stock No. 447-4499
Mfr. Part No.XPSAC3721
MYR783.15
Each
units
230 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm -
RS Stock No. 918-6686
Mfr. Part No.777301
BrandPilz
MYR1,001.55
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. 861-4890
Mfr. Part No.2TLA020053R0000
BrandABB
MYR13.33
Each
units
- - - - - - - - - - - - - -
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