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. 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. 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. 477-8684
Mfr. Part No.XPSCM1144
MYR1,452.73
Each
units
24 V dc - 4 2 Light Beam/Curtain - Preventa - Screw - - - - -
RS Stock No. 549-530
Mfr. Part No.G9SB-2002-A AC/DC24
BrandOmron
MYR943.17
Each
units
24 V ac/dc 2 - 2 Emergency Stop Automatic - - - - 112mm - 100mm 18mm
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. 744-8705
Mfr. Part No.750330
BrandPilz
MYR4,866.33
Each
units
24 → 240 V ac/dc 1 2 2 Speed/Standstill Monitoring Automatic, Manual - PLe Category 4 Screw - 98mm - 120mm 45mm
RS Stock No. 757-9314
Mfr. Part No.G9SA-321-T30 24AC/DC
BrandOmron
MYR1,510.24
Each
units
24 V ac/dc 2 1 3 Emergency Stop - - - - - 111mm - 94mm 45mm
RS Stock No. 122-2499
Mfr. Part No.R1.188.0620.0
BrandWieland
MYR1,401.40
Each
units
24 V dc 2 - 3 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock Monitored SafeRELAY - Screw CCC, CPT, CULus, EN 50156-1, EN 62061, EN ISO 13849-1, FS, GL, GOST R, TUV 96.5mm - 22.5mm 114mm
RS Stock No. 240-8800
Mfr. Part No.BD5980N.02 AC50/60Hz 230V
BrandDold
MYR2,178.20
Each
units
230 V ac 2 - 2 Two-Hand Control - Safemaster - Screw - 121mm - 74mm 45mm
RS Stock No. 733-2373
Mfr. Part No.2TLA010028R2000 RT7A 1.5s 24DC
BrandABB
MYR2,081.63
Each
units
24 V dc 1, 2 - 5 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - Terminal Block - 120mm - 84mm 45mm
RS Stock No. 447-4528
Mfr. Part No.XPSAR371144
MYR2,770.18
Each
units
24 V dc, 240 V ac 1, 2 2 7 Light Beam/Curtain - Preventa - Screw - 114mm - 99mm 99mm
RS Stock No. 156-083
Mfr. Part No.750103
BrandPilz
MYR1,236.55
Each
units
24 V dc 2 - 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock Automatic, Manual, Monitored PNOZsigma - Screw - 120mm - 102mm 17.5mm
RS Stock No. 812-8951
Mfr. Part No.119380 & ESR5-NO-31-230VAC
BrandEaton
MYR1,417.42
Each
units
- 2 - 3 Emergency Stop, Safety Switch/Interlock Automatic, Manual - - Screw - 99mm - 45mm 114.5mm
RS Stock No. 240-8737
Mfr. Part No.BD5987.02/001 DC24V
BrandDold
MYR1,742.47
Each
units
24 V dc 1, 2 - 2 Emergency Stop - Safemaster - Screw - 121mm - 74mm 45mm
RS Stock No. 489-6372
Mfr. Part No.777601
BrandPilz
MYR1,560.79
Each
units
24 V dc 1, 2 - 2 Safety Switch/Interlock Automatic, Manual PNOZ X PLe Category 4 Screw - 121mm - 94mm 22.5mm
RS Stock No. 203-8063
Mfr. Part No.774030
BrandPilz
MYR1,068.86
Each
units
24 V dc 1 2 1 Time Delay - PNOZ X PLe Category 4, SIL CL3 Screw - 121mm - 87mm 45mm
RS Stock No. 801-5943
Mfr. Part No.2981062
MYR977.01
Each
units
24 V ac/dc 2 - 4 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock Automatic, Manual - 3 Cage Clamp - 114.5mm - 112mm 22.5mm
RS Stock No. 917-6673
Mfr. Part No.2TLA010033R3000 BT51T 24DC
BrandABB
MYR812.33
Each
units
24 V dc 2 - 4 Emergency Stop, Safety Switch/Interlock Automatic - - Screw CCC, CCSAus, CE, EN 60204-1:2006 + A1:2009, EN 62061:2005, EN 954-1:1996, EN ISO 12100-1:2003, EN ISO 12100-2:2003, EN ISO 13849-1:2008, IEC 60529, IEC 60947-5-1:2009, TUV 120mm - 22.5mm 84mm
RS Stock No. 464-495
Mfr. Part No.XPSATE3710P
MYR2,713.21
Each
units
230 V ac 2 4 2 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock Automatic, Manual Preventa - Screw - 114mm - 99mm 45mm