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 Series
RS Stock No. 176-0029
Mfr. Part No.2TLA010052R0400
BrandABB Jokab
$480.03
Each
units
24 V dc 3 4 Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm -
RS Stock No. 784-5881
Mfr. Part No.3SK1230-1AW20
BrandSiemens
$266.69
Each
units
110 → 240 V ac/dc - - - - SIRIUS Automatic - Screw - 121.7mm - 100mm -
RS Stock No. 176-0035
Mfr. Part No.2TLA010040R0200
BrandABB Jokab
$244.80
Each
units
24 V dc 1 4 Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm -
RS Stock No. 146-5863
Mfr. Part No.SRB-E-201LC
BrandSchmersal
$323.74
Each
units
24 V dc 1, 2 - - - - Automatic - Plug In, Screw - 98mm - 22.5mm -
RS Stock No. 812-3909
Mfr. Part No.XPSBAE3920P
$228.06
Each
units
115 → 230 V ac - 1 Two-Hand Control 2 Preventa - - Screw - 99mm - 22.5mm -
RS Stock No. 123-2737
Mfr. Part No.280002-P
BrandIDEM
$314.37
Each
units
24 V ac/dc 2 1 Emergency Stop, Safety Switch/Interlock 3 Viper Automatic, Manual - Plug In cULus, EN 60204-1, EN 62061, EN ISO 12100, EN ISO 13849-1, EN ISO 13849-2, TUV, UL 508 99mm - 22.5mm -
RS Stock No. 712-5257
Mfr. Part No.2900526
$334.01
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 2 - - 3 Screw - 114.5mm - 112mm -
RS Stock No. 271-518
Mfr. Part No.UE403-A0930
BrandSick
$626.08
Each
units
- - - - - - - - - - - - - -
RS Stock No. 549-473
Mfr. Part No.G9SB-200-B AC/DC24
BrandOmron
$258.40
Each
units
24 V ac/dc 2 - Emergency Stop 2 - Automatic - - - 112mm - 100mm -
RS Stock No. 422-5203
Mfr. Part No.XPSAK351144P
$608.25
Each
units
24 V dc, 120 V ac 1, 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 3 Preventa - - Screw - 111mm - 99mm -
RS Stock No. 240-8686
Mfr. Part No.BN5983.53 AC50/60Hz 230V
BrandDold
$635.62
Each
units
230 V ac 2 1 Emergency Stop 3 Safemaster Monitored - Terminal Block - 121mm - 74mm -
RS Stock No. 498-937
Mfr. Part No.3RK1205-0BG00-0AA2
BrandSiemens
$232.84
Each
units
26.5 → 31.5 V dc - - - 2 SIRIUS - - Cage Clamp - 91mm - 90mm -
RS Stock No. 549-570
Mfr. Part No.G9SB200DACDC24
BrandOmron
$413.93
Each
units
24 V ac/dc 2 - Emergency Stop 2 - Manual - - - 112mm - 100mm -
RS Stock No. 176-0030
Mfr. Part No.2TLA010051R0100
BrandABB Jokab
$417.52
Each
units
265 V ac, 375 V dc - 3NO/NC Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm -
New
RS Stock No. 190-8414
Mfr. Part No.2702902
$556.20
Each
units
24 V dc 2 - - 2 - Automatic, Manual, Monitored PLe Category 4, SILCL 3 Plug-In - 116.6mm - 17.5mm -
RS Stock No. 741-8647
Mfr. Part No.SRB207AN 24V
BrandSchmersal
$764.59
Each
units
24 V dc - - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm -
RS Stock No. 890-3386
Mfr. Part No.G9SE-221-T05-DC24
BrandOmron
$251.90
Each
units
24 V dc 2 1 Emergency Stop 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 -
RS Stock No. 712-5266
Mfr. Part No.2986588
$281.15
Each
units
24 V dc - - - 3 - - 2 Screw - 114.5mm - 112mm -
RS Stock No. 180-6092
Mfr. Part No.1085346
BrandSick
$336.60
Each
units
30 V dc 2 - - 2 - - Cat 4 Plug In - 124.6mm - 18mm -
RS Stock No. 741-8669
Mfr. Part No.SRB202CA/QT 24VDC
BrandSchmersal
$694.90
Each
units
24 V dc 2 - Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm -
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