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. 893-7708
Mfr. Part No.2700548
TWD6,438.00
Each
units
24 V dc 2 3 Emergency Stop, Safety Switch/Interlock 3 Automatic, Manual PSRmini - Cage Clamp CUL, CULus, EAC, Functional Safety, UL 114.5mm - 12.5mm 116.6mm
RS Stock No. 784-5780
Mfr. Part No.3SK1111-1AB30
BrandSiemens
TWD8,853.00
Each
units
24 V ac/dc 1 4 - - Automatic, Monitored SIRIUS - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 515-1787
Mfr. Part No.R1.188.0530.1
BrandWieland
TWD5,694.00
Each
units
24 V ac/dc 2 2 Two-Hand Control 1 Monitored SafeRELAY - Screw - 114mm - 96.5mm 22.5mm
New
RS Stock No. 207-2689
Mfr. Part No.2702522
TWD13,821.00
Each
units
24 V 1 1 Safety Switch 1 - - - - - - - - -
RS Stock No. 447-4461
Mfr. Part No.XPSMP11123
TWD24,179.00
Each
units
24 V dc 1 6 Safety Mat/Edge, Safety Switch/Interlock 3 Automatic, Monitored Preventa - Screw Clamp - 114mm - 99mm 45mm
RS Stock No. 890-3389
Mfr. Part No.G9SE-201-DC24
BrandOmron
TWD3,742.00
Each
units
24 V dc 2 2 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 17.5mm
RS Stock No. 146-5863
Mfr. Part No.SRB-E-201LC
BrandSchmersal
TWD6,710.00
Each
units
24 V dc 1, 2 - - - Automatic - - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 731-8957
Mfr. Part No.XPSBCE3110C
TWD13,132.00
Each
units
24 V ac/dc - 2 Two-Hand Control 1 - Preventa - Cage Clamp - 114mm - 111mm 22.5mm
New
RS Stock No. 207-2690
Mfr. Part No.2702663
TWD5,819.00
Each
units
24 V 1 1 Safety Switch 1 - - - - - - - - -
RS Stock No. 240-8670
Mfr. Part No.BN5983.53 DC24V
BrandDold
TWD15,012.00
Each
units
24 V dc 2 3 Emergency Stop 1 Monitored Safemaster - Terminal Block - 121mm - 74mm 100mm
RS Stock No. 125-1104
Mfr. Part No.XPSVC1132P
TWD9,205.00
Each
units
24 V dc - - Safety Switch/Interlock - Manual Preventa PLe Category 4, SIL CL3 Screw BIA, CSA, DIN V VDE 801 + A1, EN/IEC 60204-1, EN/IEC 60947-1 + A1, EN/IEC 60947-5-1, UL 114mm - 22.5mm 99mm
RS Stock No. 757-9339
Mfr. Part No.G9SX-NS202-RT DC24
BrandOmron
TWD12,270.00
Each
units
24 V dc - - Safety Switch/Interlock - - - - Screw - 115mm - 100mm 23mm
RS Stock No. 201-6245
Mfr. Part No.2902725
TWD14,542.00
Each
units
24 V dc 4 3 Emergency Stop, Safety Switch None - - - - - - - - -
RS Stock No. 191-9853
Mfr. Part No.751102
BrandPilz
TWD6,634.00
Each
units
24 V dc 2 3 - 1 Automatic, Manual PNOZ s2 4 Cage Clamp - 120mm - 98mm 17.5mm
New
RS Stock No. 220-5833
Mfr. Part No.2987338
TWD309.40
Each (In a Pack of 10)
units
250 V - - - 1 - - - - - - - - -
RS Stock No. 146-5864
Mfr. Part No.SRB-E-201ST
BrandSchmersal
TWD11,553.00
Each
units
24 V dc 1, 2 - - - Automatic - - Plug In, Screw - 98mm - 22.5mm 115mm
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. 489-6372
Mfr. Part No.777601
BrandPilz
TWD9,906.00
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. 240-8737
Mfr. Part No.BD5987.02/001 DC24V
BrandDold
TWD11,453.00
Each
units
24 V dc 1, 2 2 Emergency Stop - - Safemaster - Screw - 121mm - 74mm 45mm
RS Stock No. 812-8976
Mfr. Part No.118705 & ESR5-NV3-30
BrandEaton
TWD13,290.00
Each
units
- 2 2 Emergency Stop, Safety Switch/Interlock - Automatic, Manual - - Screw - 99mm - 22.5mm 114.5mm