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. 890-3389
Mfr. Part No.G9SE-201-DC24
BrandOmron
TWD3,545.00
Each
units
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 - 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. 125-1100
Mfr. Part No.XPSPVK3484
TWD20,926.00
Each
units
24 V dc - - Emergency Stop, Safety Switch/Interlock 2 Preventa Manual PLe Category 4, SIL CL3 Screw CSA, TUV, UL - - - -
RS Stock No. 812-3909
Mfr. Part No.XPSBAE3920P
TWD6,880.00
Each
units
115 → 230 V ac - 1 Two-Hand Control 2 Preventa - - Screw - 99mm - 22.5mm 114mm
New
RS Stock No. 200-6133
Mfr. Part No.XPSUAF13AP
TWD7,852.00
Each
units
24 V 2 - Emergency Stop 3 - - - - - - - - -
RS Stock No. 741-8647
Mfr. Part No.SRB207AN 24V
BrandSchmersal
TWD13,990.00
Each
units
24 V dc - - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 45mm
RS Stock No. 180-3066
Mfr. Part No.788-906
BrandWago
TWD1,412.00
Each
units
24 V dc - 2 Safety Relay 2 - - - Cage Clamp - 64mm - 15mm 86mm
RS Stock No. 176-0022
Mfr. Part No.2TLA010070R0400
BrandABB Jokab
TWD11,840.00
Each
units
24 V dc 5 4 Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 733-2391
Mfr. Part No.2TLA010029R0000
BrandABB
TWD6,027.00
Each
units
24 V dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 2 - - - Terminal Block - 120mm - 84mm 22.5mm
RS Stock No. 812-8951
Mfr. Part No.ESR5-NO-31-230VAC
BrandEaton
TWD8,112.00
Each
units
- 2 - Emergency Stop, Safety Switch/Interlock 3 - Automatic, Manual - Screw - 99mm - 45mm 114.5mm
RS Stock No. 860-3773
Mfr. Part No.G9SR-BC201-RC
BrandOmron
TWD4,439.00
Each
units
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - - Cage Clamp - 17.6mm - 114.5mm 99mm
RS Stock No. 180-6088
Mfr. Part No.1085343
BrandSick
TWD5,348.00
Each
units
30 V dc 2 - Safety Monitoring 2 - - Cat 4 Plug In - 124.6mm - 18mm 85.5mm
RS Stock No. 656-6130
Mfr. Part No.LG5933.48 DC24V
BrandDold
TWD8,008.00
Each
units
24 V ac/dc - 1 Two-Hand Control 3 Safemaster Monitored - Screw - 121mm - 90mm 22.5mm
RS Stock No. 731-8960
Mfr. Part No.XPSBCE3410C
TWD12,861.00
Each
units
115 V ac - 1 Two-Hand Control 2 Preventa - - Cage Clamp - 114mm - 111mm 22.5mm
RS Stock No. 549-546
Mfr. Part No.G9SA-321-T15 24AC/DC
BrandOmron
TWD11,066.00
Each
units
24 V ac/dc 1, 2 1 Emergency Stop 3 - - - - - 111mm - 76mm 45mm
RS Stock No. 918-6645
Mfr. Part No.777313
BrandPilz
TWD9,520.00
Each
units
24 240 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 PNOZ X Automatic, Manual - Screw - 121mm - 94mm 45mm
New
RS Stock No. 191-9862
Mfr. Part No.751126
BrandPilz
TWD7,895.00
Each
units
24 V dc 2 1 - 3 PNOZ s6.1 Automatic 1, 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 784-5784
Mfr. Part No.3SK1111-1AW20
BrandSiemens
TWD7,870.00
Each
units
110 → 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 180-6092
Mfr. Part No.1085346
BrandSick
TWD7,405.00
Each
units
30 V dc 2 - - 2 - - Cat 4 Plug In - 124.6mm - 18mm 85.5mm
RS Stock No. 123-2744
Mfr. Part No.280002
BrandIDEM
TWD4,552.00
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 3 Viper Automatic, Manual - Screw CULus, EN 60204-1, EN 62061, EN ISO 12100, EN ISO 13849-1, EN ISO 13849-2, TUV, UL 508 99mm - 22.5mm 114mm
RS Stock No. 733-2373
Mfr. Part No.2TLA010028R2000
BrandABB
TWD14,604.00
Each
units
24 V dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 5 - - - Terminal Block - 120mm - 84mm 45mm