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. 447-4540
Mfr. Part No.XPSDME1132
$590.97
Each
units
24 V dc 1, 2 2 Safety Switch/Interlock 2 Preventa - - Screw - 114mm - 22.5mm -
RS Stock No. 155-872
Mfr. Part No.750156
BrandPilz
$506.81
Each
units
48 → 240 V ac/dc 2 1 Two-Hand Control 3 PNOZsigma - - Screw - 120mm - 98mm -
RS Stock No. 712-5248
Mfr. Part No.2900525
$340.68
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 2 - - 3 Screw - 114.5mm - 99mm -
RS Stock No. 240-8850
Mfr. Part No.BA7924.21 DC24V 1-10s
BrandDold
$246.92
Each
units
24 V dc - - Emergency Stop 2 Safemaster - - - - 133mm - 74mm -
RS Stock No. 239-1055
Mfr. Part No.774306
BrandPilz
$546.02
Each
units
24 V ac/dc 2 - Safety Switch/Interlock 2 PNOZ X Automatic, Manual - Screw - 121mm - 87mm -
RS Stock No. 893-7682
Mfr. Part No.2700467
$178.54
Each
units
24 V dc 1 3 Emergency Stop, Safety Switch/Interlock 3 PSRmini Automatic, Manual 1 Cage Clamp CUL, CULus, EAC, Functional Safety, UL 114.5mm - 112.2mm -
RS Stock No. 893-7711
Mfr. Part No.2904950
$204.20
Each
units
24 V dc 1 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Automatic 1 Screw CUL, CULus, EAC, Functional Safety, UL 102.5mm - 93.1mm -
RS Stock No. 239-1083
Mfr. Part No.774340
BrandPilz
$858.59
Each
units
24 V dc 1, 2 1 Two-Hand Control 3 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 549-530
Mfr. Part No.G9SB-2002-A AC/DC24
BrandOmron
$259.19
Each
units
24 V ac/dc 2 - Emergency Stop 2 - Automatic - - - 112mm - 100mm -
RS Stock No. 733-2436
Mfr. Part No.2TLA020052R1000
BrandABB
$798.98
Each
units
24 V dc - - Light Beam/Curtain, Safety Switch/Interlock 2 - Automatic, Manual - Screw - 120mm - 22.5mm -
RS Stock No. 122-2500
Mfr. Part No.R1.188.0720.2
BrandWieland
$397.45
Each
units
24 V ac/dc 2 1 Elevator System, Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 2 SafeRELAY Monitored - Screw CCC, CPT, CULus, DGUV, EN 62061, EN ISO 13849-1, GOST R 96.5mm - 22.5mm -
RS Stock No. 712-5254
Mfr. Part No.2900510
$360.53
Each
units
24 V ac/dc 2 1 Safety Switch/Interlock 3 - - 3 Screw - 114.5mm - 112mm -
RS Stock No. 489-6417
Mfr. Part No.774583
BrandPilz
$284.67
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 784-5807
Mfr. Part No.3SK1121-1CB42
BrandSiemens
$667.68
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm -
RS Stock No. 489-6350
Mfr. Part No.777302
BrandPilz
$679.18
Each
units
24 → 240 V ac/dc 1, 2 1 Safety Switch/Interlock 3 PNOZ X - - Screw - 121mm - 94mm -
RS Stock No. 666-7022
Mfr. Part No.2981020
$193.58
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 3 - - - Screw - 114.5mm - 99mm -
RS Stock No. 447-4506
Mfr. Part No.XPSAR311144
$930.26
Each
units
24 V dc 1, 2 2 Light Beam/Curtain 7 Preventa - - - - 114mm - 99mm -
RS Stock No. 122-2493
Mfr. Part No.R1.188.1840.0
BrandWieland
$370.07
Each
units
230 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 -
RS Stock No. 489-6401
Mfr. Part No.774581
BrandPilz
$298.33
Each
units
24 V dc 1 - Expansion Module 4 PNOZ X - - Screw - 121mm - 87mm -
RS Stock No. 447-4528
Mfr. Part No.XPSAR371144
$930.26
Each
units
24 V dc, 240 V ac 1, 2 2 Light Beam/Curtain 7 Preventa - - Screw - 114mm - 99mm -
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