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. 918-6677
Mfr. Part No.774502
BrandPilz
$885.74
Each
units
24 V dc 2 2 Emergency Stop, Safety Switch/Interlock 2 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 707-9983
Mfr. Part No.XPSVNE3442P
$841.61
Each
units
115 V 2 2 Speed/Standstill Monitoring 2 Preventa - - Screw - 99mm - 120mm 45mm
RS Stock No. 549-473
Mfr. Part No.G9SB-200-B AC/DC24
BrandOmron
$256.76
Each
units
24 V ac/dc 2 - Emergency Stop 2 - Automatic - - - 112mm - 100mm 18mm
RS Stock No. 784-5800
Mfr. Part No.3SK1121-1AB40
BrandSiemens
$523.22
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 245-1955
Mfr. Part No.774150
BrandPilz
$601.68
Each
units
24 V dc 2 1 Expansion Module 8 PNOZ X - - Screw - 121mm - 87mm 90mm
RS Stock No. 155-939
Mfr. Part No.750101
BrandPilz
$307.52
Each
units
24 V dc 1 - Emergency Stop, Safety Switch/Interlock 2 PNOZsigma Automatic, Manual - Screw - 120mm - 100mm 12.5mm
RS Stock No. 784-5793
Mfr. Part No.3SK1111-2AB30
BrandSiemens
$382.86
Each
units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Cage Clamp - 121.7mm - 100mm 22.5mm
RS Stock No. 240-8743
Mfr. Part No.BD5987.02/001 AC50/60Hz 230V
BrandDold
$492.34
Each
units
230 V ac 2 - Emergency Stop 2 Safemaster - - - - 121mm - 74mm 45mm
RS Stock No. 245-1854
Mfr. Part No.774318
BrandPilz
$638.72
Each
units
24 V dc, 230 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Monitored - Screw - 121mm - 87mm 45mm
RS Stock No. 701-9216
Mfr. Part No.UE12-2FG2DO
BrandSick
$175.00
Each
units
24 V dc 1, 2 - Light Beam/Curtain 3 - - - Screw - 70.8mm - 89.8mm 17.8mm
RS Stock No. 784-5803
Mfr. Part No.3SK1121-1CB41
BrandSiemens
$740.20
Each
units
24 V dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 712-5263
Mfr. Part No.2986575
$264.78
Each
units
24 V dc - - - 3 - - - Screw - 114.5mm - 99mm 17.5mm
RS Stock No. 814-6921
Mfr. Part No.XPSAFL5130P
$368.74
Each
units
24 V ac/dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 3 Preventa Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 123-2743
Mfr. Part No.280001
BrandIDEM
$210.45
Each
units
24 V ac/dc 1 1 Emergency Stop 3 Viper Automatic - 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. 741-8635
Mfr. Part No.SRB201ZH-24VDC
BrandSchmersal
$583.64
Each
units
24 V dc 2 2 Safety Switch/Interlock 3 PROTECT - - - - 121mm - 100mm 22.5mm
RS Stock No. 178-2438
Mfr. Part No.775600
BrandPilz
$606.72
Each
units
24 V ac 2 1 Emergency Stop 3 PNOZ X Automatic, Manual - Screw - 121mm - 87mm 90mm
RS Stock No. 123-2745
Mfr. Part No.280005
BrandIDEM
$531.02
Each
units
24 V ac/dc 2 3 Emergency Stop, Safety Switch/Interlock 7 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 - 45mm 111mm
RS Stock No. 549-489
Mfr. Part No.G9SB301BACDC24
BrandOmron
$555.37
Each
units
24 V ac/dc 2 1 Emergency Stop 3 - Automatic - - - 112mm - 100mm 23mm
RS Stock No. 893-7711
Mfr. Part No.2904950
$256.18
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 6.8mm
RS Stock No. 382-2049
Mfr. Part No.011-149
BrandSmartscan
$199.12
Each
units
24 V dc 2 1 Light Beam/Curtain 2 - Automatic, Manual - - - 60mm - 90mm 70mm
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