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. 814-6949
Mfr. Part No.XPSDME1132P
$705.70
Each
units
24 V dc 1 2 Safety Switch/Interlock 2 Preventa Monitored - Screw - 114mm - 99mm 45mm
RS Stock No. 181-2779
Mfr. Part No.UG6970.04PS/61 DC24V
BrandDold
$641.41
Each
units
24 V dc 2 - - 4 - Auto Start, Manual 4, PL e 4, SIL 3 Screw - 110mm - 22.5mm 120.3mm
RS Stock No. 410-5036
Mfr. Part No.BG5925.02/900 DC24V
BrandDold
$510.69
Each
units
24 V dc - - Emergency Stop 2 Safemaster - - - - - - - -
RS Stock No. 893-7705
Mfr. Part No.2700570
$354.55
Each
units
24 V dc 2 3 Emergency Stop, Safety Switch/Interlock 3 PSRmini Automatic, Manual 4 Cage Clamp cUL, cULus, EAC, Functional Safety, UL 114.5mm - 116.6mm 12.5mm
RS Stock No. 712-5250
Mfr. Part No.2900509
$367.21
Each
units
24 V ac/dc 1, 2 1 Safety Switch/Interlock 3 - - 3 Screw - 114.5mm - 99mm 22.5mm
RS Stock No. 122-2491
Mfr. Part No.R1.188.1830.0
BrandWieland
$369.41
Each
units
115 → 120 V ac 2 1 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 safeRELAY Manual - 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. 812-8951
Mfr. Part No.ESR5-NO-31-230VAC
BrandEaton
$424.96
Each
units
- 2 - Emergency Stop, Safety Switch/Interlock 3 - Automatic, Manual - Screw - 99mm - 45mm 114.5mm
RS Stock No. 155-850
Mfr. Part No.750126
BrandPilz
$538.29
Each
units
24 V dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm 22.5mm
RS Stock No. 176-0034
Mfr. Part No.2TLA010041R0600
BrandABB Jokab
$244.79
Each
units
24 V dc - 4NO/NC Safety Switch 5 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
New
RS Stock No. 201-1475
Mfr. Part No.XPSUEP34AP
$324.00
Each
units
24 V ac/dc 1 4 Emergency Stop 5 - - - - - - - - -
RS Stock No. 893-7739
Mfr. Part No.2904955
$294.62
Each
units
24 V dc 2 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Manual 4 Screw cUL, cULus, EAC, Functional Safety, UL 102.5mm - 93.1mm 6.8mm
RS Stock No. 814-6915
Mfr. Part No.XPSAV11113P
$886.65
Each
units
24 V dc 2 3 Emergency Stop, Safety Switch/Interlock 6 Preventa Automatic, Monitored - Screw - 114mm - 99mm 45mm
RS Stock No. 422-5203
Mfr. Part No.XPSAK351144P
$548.87
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 45mm
New
RS Stock No. 200-6133
Mfr. Part No.XPSUAF13AP
$430.83
Each
units
24 V 2 - Emergency Stop 3 - - - - - - - - -
RS Stock No. 447-4607
Mfr. Part No.XPSBF1132
$1,100.55
Each
units
24 V dc - 2 Two-Hand Control 2 Preventa - - - - 114mm - 99mm 22.5mm
RS Stock No. 125-1099
Mfr. Part No.XPSPVK1184
$1,546.73
Each
units
24 V dc - - Emergency Stop, Safety Switch/Interlock 2 Preventa Manual PLe Category 4, SIL CL3 Screw CSA, TUV, UL - - - -
New
RS Stock No. 191-9875
Mfr. Part No.751330
BrandPilz
$1,606.46
Each
units
24 → 240 V ac/dc - 2 Safety Switch 2 PNOZ s30 Automatic, Manual 2, 4 Cage Clamp - 120mm - 98mm 45mm
RS Stock No. 733-2418
Mfr. Part No.2TLA010002R0000
BrandABB
$628.01
Each
units
24 V dc 2 - Two-Hand Control 4 - - - Screw - 120mm - 74mm 45mm
RS Stock No. 784-5813
Mfr. Part No.3SK1121-2CB41
BrandSiemens
$702.82
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 784-5847
Mfr. Part No.3SK1122-2CB44
BrandSiemens
$315.10
Each
units
24 V dc 1 - - - SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm