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. 327-7629
Mfr. Part No.BG5925.22 AC/DC24V
BrandDold
$413.86
Each
units
24 V ac/dc 1, 2 - Emergency Stop 3 Safemaster - - - - 118mm - 84mm 22.5mm
New
RS Stock No. 191-9858
Mfr. Part No.751108
BrandPilz
$214.94
Each
units
24 V dc 2 - Safety Switch 2 PNOZ s8 Automatic 3 Cage Clamp - 120mm - 98mm 12.5mm
RS Stock No. 176-0035
Mfr. Part No.2TLA010040R0200
BrandABB Jokab
$222.54
Each
units
24 V dc 1 4 Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
New
RS Stock No. 201-1460
Mfr. Part No.XPSUAF33AP
$351.90
Each
units
48-230 V ac/dc 1 4 Emergency Stop 5 - - - - - - - - -
RS Stock No. 180-6088
Mfr. Part No.1085343
BrandSick
$215.00
Each
units
30 V dc 2 - Safety Monitoring 2 - - Cat 4 Plug In - 124.6mm - 18mm 85.5mm
RS Stock No. 814-6949
Mfr. Part No.XPSDME1132P
$683.14
Each
units
24 V dc 1 2 Safety Switch/Interlock 2 Preventa Monitored - Screw - 114mm - 99mm 45mm
RS Stock No. 731-8960
Mfr. Part No.XPSBCE3410C
$612.47
Each
units
115 V ac - 1 Two-Hand Control 2 Preventa - - Cage Clamp - 114mm - 111mm 22.5mm
RS Stock No. 184-0136
Mfr. Part No.3SK29412AA10
BrandSiemens
$704.39
Each
units
- 2 - - - SIRIUS - 4, PLe 3, SIL 3 Plug In - 100mm - 22.5mm 124.5mm
New
RS Stock No. 191-9868
Mfr. Part No.751160
BrandPilz
$297.88
Each
units
24 V dc 2 1 Expansion Module - PNOZ s20 Automatic 2, 4 Cage Clamp - 120mm - 98mm 22.5mm
New
RS Stock No. 191-9856
Mfr. Part No.751105
BrandPilz
$639.36
Each
units
24 V dc 2 - - 2 PNOZ s5 Automatic, Manual 4 Cage Clamp - 120mm - 98mm 22.5mm
New
RS Stock No. 201-1464
Mfr. Part No.XPSUAF33AC
$351.90
Each
units
48-230 V ac/dc 1 4 Emergency Stop 5 - - - - - - - - -
RS Stock No. 190-8413
Mfr. Part No.2702524
$264.69
Each
units
24 V dc 2 - - 1 - - SIL 3 Screw - 93.1mm ATEX, IECEx 6.8mm 102.5mm
New
RS Stock No. 201-1473
Mfr. Part No.XPSUDN13AC
$476.10
Each
units
24 V ac/dc 1 8 Emergency Stop 5 - - - - - - - - -
RS Stock No. 122-2496
Mfr. Part No.R1.188.1450.0
BrandWieland
$317.24
Each
units
115 → 120 V ac 2 1 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 safeRELAY Manual, Monitored - 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. 177-9024
Mfr. Part No.SCR ON4-W22-3.6-S
$306.33
Each
units
24 V dc, 230 V ac 1 3 Two-Hand Control - - - - Screw - 114.5mm - 22.5mm 99mm
RS Stock No. 183-7199
Mfr. Part No.3SK2112-2AA10
BrandSiemens
$824.56
Each
units
24 V dc 2 - - - SIRIUS - PLe, SIL 3 Push In - 100mm - 22.5mm 124.5mm
New
RS Stock No. 201-1497
Mfr. Part No.XPSUEP34AC
$310.50
Each
units
24 V ac/dc 1 4 Emergency Stop Monitoring 5 - - - - - - - - -
RS Stock No. 176-0030
Mfr. Part No.2TLA010051R0100
BrandABB Jokab
$379.56
Each
units
265 V ac, 375 V dc - 3NO/NC Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 146-5864
Mfr. Part No.SRB-E-201ST
BrandSchmersal
$547.22
Each
units
24 V dc 1, 2 - - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 183-7202
Mfr. Part No.3SK2611-3AA00
BrandSiemens
$793.53
Each
units
- - - - - SIRIUS - - Screw - 60mm - 96mm 41.9mm
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