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 Safety Contacts Function Auxiliary Contacts Reset Method Range Safety Category Terminal Type Standards Met Depth Hazardous Area Certification Length Width
RS Stock No. 176-0008
Mfr. Part No.2TLA010070R0000 Sentry USR10 24VDC
BrandABB Jokab
PHP20,621.48
Each
units
24 V dc 5 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0032
Mfr. Part No.2TLA010050R0100 Sentry SSR10M VAC/VDC
BrandABB Jokab
PHP15,897.00
Each
units
265 V ac, 375 V dc 2 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0025
Mfr. Part No.2TLA010061R0000 Sentry TSR20 24VDC
BrandABB Jokab
PHP12,758.45
Each
units
24 V dc 3 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0035
Mfr. Part No.2TLA010040R0200 Sentry BSR11 24VDC
BrandABB Jokab
PHP10,236.45
Each
units
24 V dc 1 4 Safety Switch 4 Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0031
Mfr. Part No.2TLA010051R0000 Sentry SSR20 24VDC
BrandABB Jokab
PHP13,890.87
Each
units
24 V dc - 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0029
Mfr. Part No.2TLA010052R0400 Sentry SSR32 24VDC
BrandABB Jokab
PHP19,489.58
Each
units
24 V dc 3 4 Safety Switch 4 Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0033
Mfr. Part No.2TLA010050R0000 Sentry SSR10 24VDC
BrandABB Jokab
PHP12,195.86
Each
units
24 V dc 3 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0030
Mfr. Part No.2TLA010051R0100 Sentry SSR20M VAC/VDC
BrandABB Jokab
PHP16,951.73
Each
units
265 V ac, 375 V dc - 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0022
Mfr. Part No.2TLA010070R0400 Sentry USR22 24VDC
BrandABB Jokab
PHP25,969.34
Each
units
24 V dc 5 4 Safety Switch 4 Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0009
Mfr. Part No.2TLA010040R0000 Sentry BSR10 24VDC
BrandABB Jokab
PHP9,938.25
Each
units
24 V dc 1 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0034
Mfr. Part No.2TLA010041R0600 Sentry BSR23 24VDC
BrandABB Jokab
PHP9,938.25
Each
units
24 V dc - 5 Safety Switch 4NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0027
Mfr. Part No.2TLA010053R0400 Sentry SSR42 24VDC
BrandABB Jokab
PHP19,489.58
Each
units
24 V dc 3 4 Safety Switch 4 Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0024
Mfr. Part No.2TLA010061R0100 Sentry TSR20M VAC/VDC
BrandABB Jokab
PHP12,405.01
Each
units
265 V ac, 375 V dc 2 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 176-0026
Mfr. Part No.2TLA010060R0000 Sentry TSR10 24VDC
BrandABB Jokab
PHP15,644.69
Each
units
24 V dc 3 4 Safety Switch 3NO/NC Multi-Reset Sentry 4 Screw - 120mm - 22.5mm 120mm