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. 481-8237
Mfr. Part No.XPSAK351144
MYR1,233.45
Each
units
120 V ac 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa Automatic, Manual - Screw - 114mm - 99mm 45mm
RS Stock No. 549-530
Mfr. Part No.G9SB-2002-A AC/DC24
BrandOmron
MYR1,266.29
Each
units
24 V ac/dc 2 - Emergency Stop 2 - Automatic - - - 112mm - 100mm 18mm
RS Stock No. 549-473
Mfr. Part No.G9SB-200-B AC/DC24
BrandOmron
MYR1,191.80
Each
units
24 V ac/dc 2 - Emergency Stop 2 - Automatic - - - 112mm - 100mm 18mm
RS Stock No. 477-8684
Mfr. Part No.XPSCM1144
MYR1,570.75
Each
units
24 V dc - 4 Light Beam/Curtain 2 Preventa - - Screw - - - - -
RS Stock No. 860-3773
Mfr. Part No.G9SR-BC201-RC
BrandOmron
MYR617.25
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. 712-5248
Mfr. Part No.2900525
MYR1,068.75
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 2 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 609-7167
Mfr. Part No.XPSAFL5130
MYR1,044.73
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 447-4499
Mfr. Part No.XPSAC3721
MYR783.15
Each
units
230 V ac - 1 Emergency Stop 3 Preventa - - Screw - 114mm - 99mm 22.5mm
RS Stock No. 666-7117
Mfr. Part No.2963776
MYR637.27
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 3 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 712-5279
Mfr. Part No.2986957
MYR1,099.90
Each
units
24 V dc - - - 3 - - 3 Cage Clamp - 114.5mm - 112mm 17.5mm
RS Stock No. 712-5260
Mfr. Part No.2986960
MYR837.64
Each
units
24 V dc - - - 3 - - 3 Screw - 114.5mm - 99mm 17.5mm
RS Stock No. 784-5822
Mfr. Part No.3SK1121-2CB42
BrandSiemens
MYR1,425.85
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 378-5394
Mfr. Part No.774438
BrandPilz
MYR2,212.37
Each
units
230 V ac 2 1 Two-Hand Control 3 PNOZ X Manual - Screw - 121mm - 101mm 45mm
RS Stock No. 203-8063
Mfr. Part No.774030
BrandPilz
MYR1,008.01
Each
units
24 V dc 1 2 Speed/Standstill Monitoring 1 PNOZ X - - Screw - 121mm - 87mm 45mm
RS Stock No. 784-5796
Mfr. Part No.3SK1111-2AW20
BrandSiemens
MYR993.24
Each
units
110 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 155-844
Mfr. Part No.750106
BrandPilz
MYR1,816.76
Each
units
24 V dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm
RS Stock No. 757-9310
Mfr. Part No.G9SA-321-T075 AC/DC24
BrandOmron
MYR1,590.47
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - - - - - 111mm - 94mm 45mm
RS Stock No. 122-2497
Mfr. Part No.R1.188.1810.0
BrandWieland
MYR944.14
Each
units
24 V ac/dc 2 1 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 safeRELAY Manual - Screw CCC, CPT, cULus, EN 50156-1, EN 61511, EN 62061, EN 81-1, EN ISO 13849-1, FS, GL, GOST R, TUV 96.5mm - 22.5mm 114mm
RS Stock No. 122-2499
Mfr. Part No.R1.188.0620.0
BrandWieland
MYR1,170.90
Each
units
24 V dc 2 - Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 safeRELAY Monitored - 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. 741-8653
Mfr. Part No.SRB301ST-24V-(V.2)
BrandSchmersal
MYR1,587.10
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm
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