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 Safety Contacts Function Reset Method Range Safety Category Terminal Type Standards Met Depth Hazardous Area Certification Length Width
RS Stock No. 464-491
Mfr. Part No.XPSATE5110P
MYR2,634.88
Each
units
24 V dc 2 4 2 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock Automatic, Manual Preventa - Screw - 114mm - 99mm 45mm
RS Stock No. 666-7078
Mfr. Part No.2981936
MYR625.82
Each
units
24 V dc - - - Safety Switch/Interlock - - - - - 106mm - 99mm 22.5mm
RS Stock No. 291-3201
Mfr. Part No.BG5924.48 AC/DC24V
BrandDold
MYR1,385.43
Each
units
24 V dc 1 - 4 Emergency Stop - Safemaster - - - 121mm - 84mm 22.5mm
RS Stock No. 801-5873
Mfr. Part No.2901422
MYR1,218.32
Each
units
120 V ac/dc 2 - 4 Safety Switch/Interlock Automatic, Manual - 3 Cage Clamp - 114.5mm - 99mm 22.5mm
RS Stock No. 733-2351
Mfr. Part No.2TLA010026R0500 RT6 230AC
BrandABB
MYR2,160.82
Each
units
230 V ac 1, 2 - 4 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - Terminal Block - 120mm - 84mm 45mm
RS Stock No. 362-0152
Mfr. Part No.774709
BrandPilz
MYR2,436.67
Each
units
24 V dc 1, 2 4 6 Safety Switch/Interlock Automatic, Manual PNOZ X PLe Category 4 Screw - 121mm - 87mm 90mm
RS Stock No. 122-2493
Mfr. Part No.R1.188.1840.0
BrandWieland
MYR1,124.88
Each
units
230 V ac 2 1 3 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock Manual SafeRELAY - 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 114mm
RS Stock No. 918-6645
Mfr. Part No.777313
BrandPilz
MYR1,474.60
Each
units
24 → 240 V ac/dc 2 1 3 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock Automatic, Manual PNOZ X - Screw - 121mm - 94mm 45mm
RS Stock No. 666-7044
Mfr. Part No.2963802
MYR736.00
Each
units
24 V ac/dc 1 1 4 Emergency Stop, Safety Switch/Interlock - - 1 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 447-4534
Mfr. Part No.XPSDMB1132
MYR1,278.09
Each
units
24 V dc 1, 2 2 2 Safety Switch/Interlock - Preventa 4 Screw - 114mm - 22.5mm 99mm
RS Stock No. 447-4499
Mfr. Part No.XPSAC3721
MYR772.84
Each
units
230 V ac - 1 3 Emergency Stop - Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 609-7151
Mfr. Part No.XPSAC1321
MYR1,324.56
Each
units
48 V ac - 1 3 Emergency Stop - Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 666-7117
Mfr. Part No.2963776
MYR765.71
Each
units
24 V ac/dc 2 1 3 Emergency Stop, Safety Switch/Interlock - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 712-5279
Mfr. Part No.2986957
MYR927.50
Each
units
24 V dc - - 3 - - - 3 Cage Clamp - 114.5mm - 112mm 17.5mm
RS Stock No. 362-0174
Mfr. Part No.774350
BrandPilz
MYR2,369.73
Each
units
24 V dc 2 1 2 Two-Hand Control Monitored PNOZ X - Screw - 121mm - 87mm 22.5mm
RS Stock No. 860-3773
Mfr. Part No.G9SR-BC201-RC
BrandOmron
MYR702.87
Each
units
24 V dc 2 - - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - Cage Clamp - 17.6mm - 114.5mm 99mm
RS Stock No. 609-7167
Mfr. Part No.XPSAFL5130
MYR1,103.80
Each
units
24 V ac/dc 1, 2 - 3 Light Beam/Curtain - Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 481-8237
Mfr. Part No.XPSAK351144
MYR1,384.38
Each
units
120 V ac 2 1 3 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock Automatic, Manual Preventa - Screw - 114mm - 99mm 45mm
RS Stock No. 918-6649
Mfr. Part No.777512
BrandPilz
MYR2,319.02
Each
units
24 V dc 2 2 3 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock Automatic, Manual PNOZ X PLe Category 4, SIL CL3 Screw - 121mm - 94mm 45mm
RS Stock No. 712-5248
Mfr. Part No.2900525
MYR889.50
Each
units
24 V ac/dc 2 1 2 Safety Switch/Interlock - - 3 Screw - 114.5mm - 99mm 22.5mm