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. 712-5250
Mfr. Part No.2900509
PHP12,472.37
Each
units
24 V ac/dc 1, 2 1 Safety Switch/Interlock 3 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 741-8650
Mfr. Part No.SRB 301MC-24V
BrandSchmersal
PHP16,586.90
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm
RS Stock No. 757-9320
Mfr. Part No.G9SX-GS226-T15-RT DC24
BrandOmron
PHP33,347.10
Each
units
24 V dc 2 - Safety Switch/Interlock - - - - Screw - 115mm - 100mm 45.5mm
RS Stock No. 489-6350
Mfr. Part No.777302
BrandPilz
PHP16,317.40
Each
units
24 240 V ac/dc 1, 2 1 Safety Switch/Interlock 3 PNOZ X - - Screw - 121mm - 94mm 22.5mm
RS Stock No. 489-6401
Mfr. Part No.774581
BrandPilz
PHP9,622.34
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 549-603
Mfr. Part No.G9SB301DACDC24
BrandOmron
PHP18,017.15
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - Manual - - - 112mm - 100mm 23mm
RS Stock No. 360-4352
Mfr. Part No.XPSAF5130P
PHP10,279.31
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 918-6645
Mfr. Part No.777313
BrandPilz
PHP15,707.51
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 45mm
RS Stock No. 239-1049
Mfr. Part No.774303
BrandPilz
PHP9,820.87
Each
units
24 V ac/dc 2 - Light Beam/Curtain, Safety Switch/Interlock 2 PNOZ X Manual - Screw - 121mm - 87mm 22.5mm
RS Stock No. 240-8692
Mfr. Part No.BD5935.48 DC24V
BrandDold
PHP17,471.75
Each
units
24 V dc 1, 2 - Emergency Stop 4 Safemaster - - Screw - 121mm - 74mm 45mm
RS Stock No. 240-8743
Mfr. Part No.BD5987.02/001 AC50/60Hz 230V
BrandDold
PHP16,550.31
Each
units
230 V ac 2 - Emergency Stop 2 Safemaster - - - - 121mm - 74mm 45mm
RS Stock No. 666-7117
Mfr. Part No.2963776
PHP8,243.32
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 3 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 155-939
Mfr. Part No.750101
BrandPilz
PHP12,213.10
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 2 PNOZsigma Automatic, Manual - Screw - 120mm - 100mm 12.5mm
RS Stock No. 245-1955
Mfr. Part No.774150
BrandPilz
PHP18,046.45
Each
units
24 V dc 2 1 Expansion Module 8 PNOZ X - - Screw - 121mm - 87mm 90mm
RS Stock No. 362-0174
Mfr. Part No.774350
BrandPilz
PHP24,453.77
Each
units
24 V dc 2 1 Two-Hand Control 2 PNOZ X Monitored - Screw - 121mm - 87mm 22.5mm
RS Stock No. 812-8960
Mfr. Part No.ESR5-NO-31-24VAC-DC
BrandEaton
PHP19,117.80
Each
units
- 2 - Emergency Stop, Safety Switch/Interlock 3 - Automatic, Manual - Screw - 99mm - 22.5mm 114.5mm
RS Stock No. 860-3773
Mfr. Part No.G9SR-BC201-RC
BrandOmron
PHP7,322.55
Each
units
19.2 28.8 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - - Cage Clamp - 17.6mm - 114.5mm 99mm
RS Stock No. 918-6686
Mfr. Part No.777301
BrandPilz
PHP12,472.82
Each
units
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm 22.5mm
RS Stock No. 666-7022
Mfr. Part No.2981020
PHP6,267.77
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 3 - - - Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 240-8709
Mfr. Part No.BD5935.48 AC50/60Hz 230V
BrandDold
PHP18,198.81
Each
units
230 V ac 2 1 Emergency Stop 3 Safemaster Monitored - Terminal Block - 121mm - 74mm 45mm
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