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
New
RS Stock No. 211-8959
Mfr. Part No.3RK1105-1BE04-2CA0
BrandSiemens
TWD30,927.00
Each
units
250 2 - - - - - - - - - - - -
RS Stock No. 447-4477
Mfr. Part No.XPSAC5121
TWD5,279.00
Each
units
24 V ac/dc - 3 Emergency Stop 1 - Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 177-9022
Mfr. Part No.SCR2-W22-2.5-S
TWD5,461.00
Each
units
24 V dc, 230 V ac 1 - Two-Hand Control 2 - - - Screw - - - - -
RS Stock No. 741-8669
Mfr. Part No.SRB202CA/QT 24VDC
BrandSchmersal
TWD16,350.00
Each
units
24 V dc 2 - Safety Switch/Interlock - - PROTECT - Screw - 121mm - 100mm 22.5mm
RS Stock No. 666-7038
Mfr. Part No.2963912
TWD9,701.00
Each
units
24 V ac/dc 1, 2 8 Emergency Stop, Safety Switch/Interlock 1 - - 3 Screw - 114.5mm - 99mm 45mm
RS Stock No. 733-2360
Mfr. Part No.2TLA010028R1000 RT7B 3s 24DC
BrandABB
TWD14,553.00
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. 180-6090
Mfr. Part No.RLY3-OSSD2
BrandSick
TWD7,313.00
Each
units
30 V dc - 2 - - Automatic, Manual - Cat 4 Plug In - 124.6mm - 18mm 85.5mm
RS Stock No. 890-3382
Mfr. Part No.G9SE-401-DC24
BrandOmron
TWD4,336.00
Each
units
24 V dc 2 4 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 1 Automatic, Manual - - Screw CAN C22.2 No.14, CSA C22.2 No.14, EN 62061 SIL3, EN 81-1, EN 81-2, EN ISO 13849-1: 2008 PL e Safety Category 4, EN/IEC 60947-5-1, GB 14048.5, IEC 62061 SIL 3, UL508 111.6mm - 144.5mm 22.5mm
RS Stock No. 814-6949
Mfr. Part No.XPSDME1132P
TWD14,423.00
Each
units
24 V dc 1 2 Safety Switch/Interlock 2 Monitored Preventa - Screw - 114mm - 99mm 45mm
RS Stock No. 712-5260
Mfr. Part No.2986960
TWD6,986.00
Each
units
24 V dc - 3 - - - - 3 Screw - 114.5mm - 99mm 17.5mm
RS Stock No. 180-3066
Mfr. Part No.788-906
BrandWago
TWD1,449.00
Each
units
24 V dc - 2 Safety Relay 2 - - - Cage Clamp - 64mm - 15mm 86mm
RS Stock No. 239-1061
Mfr. Part No.774314
BrandPilz
TWD8,247.00
Each
units
24 V dc, 110 V ac 2 3 Safety Switch/Interlock 1 Automatic, Monitored PNOZ X - Screw - 121mm - 87mm 45mm
RS Stock No. 741-8635
Mfr. Part No.SRB201ZH-24VDC
BrandSchmersal
TWD12,322.00
Each
units
24 V dc 2 3 Safety Switch/Interlock 2 - PROTECT - - - 121mm - 100mm 22.5mm
New
RS Stock No. 219-9222
Mfr. Part No.XPSAXE5120C
TWD7,518.00
Each
units
230 V - - - - - - - - - - - - -
RS Stock No. 893-7736
Mfr. Part No.2904954
TWD4,603.00
Each
units
24 V dc 2 1 Emergency Stop, Safety Switch/Interlock 1 Automatic PSRmini - Screw CUL, CULus, EAC, Functional Safety, UL 102.5mm - 6.8mm 93.1mm
New
RS Stock No. 211-9560
Mfr. Part No.3TK2810-1BA41
BrandSiemens
TWD62,923.00
Each
units
24 V 2 2 - 1 - - - - - - - - -
RS Stock No. 814-6937
Mfr. Part No.XPSBF1132P
TWD16,207.00
Each
units
24 V dc 1 2 Two-Hand Control - - Preventa - Screw - 114mm - 99mm 22.5mm
RS Stock No. 712-5266
Mfr. Part No.2986588
TWD5,683.00
Each
units
24 V dc - 3 - - - - 2 Screw - 114.5mm - 112mm 17.5mm
RS Stock No. 176-0024
Mfr. Part No.2TLA010061R0100 Sentry TSR20M VAC/VDC
BrandABB Jokab
TWD7,982.00
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. 784-5803
Mfr. Part No.3SK1121-1CB41
BrandSiemens
TWD15,991.00
Each
units
24 V dc 1 4 - - Automatic, Monitored SIRIUS - Screw - 121.7mm - 100mm 22.5mm