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. 324-7268
Mfr. Part No.774056
BrandPilz
MYR680.56
Each
units
230 V ac 1 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 666-7022
Mfr. Part No.2981020
MYR568.37
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 3 - - - Screw - 114.5mm - 99mm -
RS Stock No. 812-8960
Mfr. Part No.ESR5-NO-31-24VAC-DC
BrandEaton
MYR1,033.23
Each
units
- 2 - Emergency Stop, Safety Switch/Interlock 3 - Automatic, Manual - Screw - 99mm - 22.5mm -
RS Stock No. 666-7038
Mfr. Part No.2963912
MYR1,390.20
Each
units
24 V ac/dc 1, 2 1 Emergency Stop, Safety Switch/Interlock 8 - - 3 Screw - 114.5mm - 99mm -
RS Stock No. 489-6417
Mfr. Part No.774583
BrandPilz
MYR766.76
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 801-6028
Mfr. Part No.2981457
MYR575.91
Each
units
24 V ac/dc 1 - - 6 - - 1 Cage Clamp - 56mm - 111mm -
RS Stock No. 489-6401
Mfr. Part No.774581
BrandPilz
MYR806.41
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 240-8692
Mfr. Part No.BD5935.48 DC24V
BrandDold
MYR1,052.02
Each
units
24 V dc 1, 2 - Emergency Stop 4 Safemaster - - Screw - 121mm - 74mm -
RS Stock No. 666-7062
Mfr. Part No.2981680
MYR1,333.38
Each
units
24 V dc 1 - Expansion Module 6 - - 3 Screw - 114.5mm - 112mm -
RS Stock No. 321-9049
Mfr. Part No.SNO 4062K-A-00C
BrandWieland
MYR618.16
Each
units
24 V ac/dc 2 1 Emergency Stop 2 SafeRELAY - - Screw - 114mm - 96.5mm -
RS Stock No. 861-5001
Mfr. Part No.2TLA020071R8000
BrandABB
MYR2,393.09
Each
units
24 V dc - - - - Pluto - - - - - - - GATE-P2
RS Stock No. 549-609
Mfr. Part No.G9SA-301 24AC/DC
BrandOmron
MYR1,086.11
Each
units
24 V ac/dc 1, 2 1 Emergency Stop 3 - - - - - 111mm - 76mm -
RS Stock No. 812-8976
Mfr. Part No.ESR5-NV3-30
BrandEaton
MYR1,892.39
Each
units
- 2 - Emergency Stop, Safety Switch/Interlock 2 - Automatic, Manual - Screw - 99mm - 22.5mm -
RS Stock No. 814-6946
Mfr. Part No.XPSDMB1132P
MYR1,013.85
Each
units
24 V dc 1 2 Safety Switch/Interlock 2 Preventa Monitored - Screw - 114mm - 99mm -
RS Stock No. 812-8979
Mfr. Part No.ESR5-NZ-21-24VAC-DC
BrandEaton
MYR1,089.40
Each
units
- 2 - Safety Switch/Interlock, Two Hand Control 2 - Automatic, Manual - Screw - 99mm - 22.5mm -
RS Stock No. 362-0168
Mfr. Part No.774585
BrandPilz
MYR832.55
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X Automatic - Screw - 121mm - 87mm -
RS Stock No. 784-5813
Mfr. Part No.3SK1121-2CB41
BrandSiemens
MYR1,218.50
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm -
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. 733-2391
Mfr. Part No.2TLA010029R0000
BrandABB
MYR689.51
Each
units
24 V dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 2 - - - Terminal Block - 120mm - 84mm -
RS Stock No. 239-1055
Mfr. Part No.774306
BrandPilz
MYR869.96
Each
units
24 V ac/dc 2 - Safety Switch/Interlock 2 PNOZ X Automatic, Manual - Screw - 121mm - 87mm -
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