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. 245-1848
Mfr. Part No.774310
BrandPilz
$740.39
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 489-6417
Mfr. Part No.774583
BrandPilz
$287.26
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 489-6401
Mfr. Part No.774581
BrandPilz
$301.04
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm 22.5mm
New
RS Stock No. 190-8413
Mfr. Part No.2702524
$294.10
Each
units
24 V dc 2 - - 1 - - SIL 3 Screw - 93.1mm ATEX, IECEx 6.8mm 102.5mm
New
RS Stock No. 190-8414
Mfr. Part No.2702902
$556.20
Each
units
24 V dc 2 - - 2 - Automatic, Manual, Monitored PLe Category 4, SILCL 3 Plug-In - 116.6mm - 17.5mm 114.5mm
RS Stock No. 176-0025
Mfr. Part No.2TLA010061R0000
BrandABB Jokab
$317.08
Each
units
24 V dc 3 3NO/NC Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0026
Mfr. Part No.2TLA010060R0000
BrandABB Jokab
$388.82
Each
units
24 V dc 3 3NO/NC Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0035
Mfr. Part No.2TLA010040R0200
BrandABB Jokab
$247.02
Each
units
24 V dc 1 4 Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
New
RS Stock No. 191-9858
Mfr. Part No.751108
BrandPilz
$230.62
Each
units
24 V dc 2 - Safety Switch 2 PNOZ s8 Automatic 3 Cage Clamp - 120mm - 98mm 12.5mm
RS Stock No. 784-5847
Mfr. Part No.3SK1122-2CB44
BrandSiemens
$317.96
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 176-0027
Mfr. Part No.2TLA010053R0400
BrandABB Jokab
$484.39
Each
units
24 V dc 3 4 Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
New
RS Stock No. 191-9874
Mfr. Part No.751189
BrandPilz
$449.23
Each
units
24 V dc 2 1 Safety Switch 3 PNOZ s9 Manual 4 Cage Clamp - 120mm - 98mm 17.5mm
New
RS Stock No. 191-9855
Mfr. Part No.751103
BrandPilz
$310.90
Each
units
24 V dc 2 - - 2 PNOZ s3 Automatic, Manual, Monitored 4 Cage Clamp - 120mm - 98mm 17.5mm
New
RS Stock No. 197-3298
Mfr. Part No.3SK1911-3SB40
BrandSiemens
$607.98
Each
units
24 V - - Emergency Stop - - - - - - - - - -
RS Stock No. 814-6946
Mfr. Part No.XPSDMB1132P
$494.28
Each
units
24 V dc 1 2 Safety Switch/Interlock 2 Preventa Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 917-6664
Mfr. Part No.2TLA010033R2000
BrandABB
$262.58
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 4 - Automatic - Screw - 120mm - 84mm 22.5mm
RS Stock No. 893-7727
Mfr. Part No.2904953
$226.04
Each
units
24 V dc 2 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Manual 3 Screw cUL, cULus, EAC, Functional Safety, UL 102.5mm - 93.1mm 6.8mm
RS Stock No. 180-6090
Mfr. Part No.1085344
BrandSick
$330.00
Each
units
30 V dc - - - 2 - Automatic, Manual Cat 4 Plug In - 124.6mm - 18mm 85.5mm
RS Stock No. 784-5829
Mfr. Part No.3SK1122-1CB41
BrandSiemens
$317.96
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 666-7044
Mfr. Part No.2963802
$346.60
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock 4 - - 1 Screw - 114.5mm - 99mm 22.5mm
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