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. 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. 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
RS Stock No. 447-4506
Mfr. Part No.XPSAR311144
$839.20
Each
units
24 V dc 1, 2 2 Light Beam/Curtain 7 Preventa - - - - 114mm - 99mm 99mm
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. 327-7635
Mfr. Part No.BH5932.22 DC24V 15IPM
BrandDold
$478.93
Each
units
24 V dc 2 - Speed/Standstill Monitoring 3 Safemaster - - - - 118mm - 84mm 45mm
RS Stock No. 240-8850
Mfr. Part No.BA7924.21 DC24V 1-10s
BrandDold
$224.47
Each
units
24 V dc - - Emergency Stop 2 Safemaster - - - - 133mm - 74mm 45mm
RS Stock No. 549-536
Mfr. Part No.G9SA-501 24AC/DC
BrandOmron
$669.86
Each
units
24 V ac/dc 1, 2 1 Emergency Stop 5 - - - - - 111mm - 76mm 45mm
RS Stock No. 656-6051
Mfr. Part No.RK5942.03 AC/DC24V
BrandDold
$191.99
Each
units
24 V ac/dc 1 - Emergency Stop - Safemaster - - Screw - 71mm - 90mm 17.5mm
RS Stock No. 125-1095
Mfr. Part No.XPSAK371144P
$522.33
Each
units
24 V dc, 230 V ac 2 - Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 1 Preventa Manual PLe Category 4, SIL CL3 Screw CSA, EN/IEC 60204-1, EN/IEC 60947-5-1, TUV, UL 114mm - 45mm 99mm
RS Stock No. 784-5780
Mfr. Part No.3SK1111-1AB30
BrandSiemens
$494.06
Each
units
24 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 489-6366
Mfr. Part No.777602
BrandPilz
$772.61
Each
units
24 V dc 1, 2 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 94mm 22.5mm
RS Stock No. 733-2360
Mfr. Part No.2TLA010028R1000
BrandABB
$691.83
Each
units
24 V dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 5 - - - Terminal Block - 120mm - 84mm 45mm
RS Stock No. 240-8670
Mfr. Part No.BN5983.53 DC24V
BrandDold
$635.14
Each
units
24 V dc 2 1 Emergency Stop 3 Safemaster Monitored - Terminal Block - 121mm - 74mm 100mm
RS Stock No. 123-2738
Mfr. Part No.280005-P
BrandIDEM
$596.12
Each
units
24 V ac/dc 2 3 Emergency Stop, Safety Switch/Interlock 7 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 - 45mm 111mm
RS Stock No. 203-8035
Mfr. Part No.774073
BrandPilz
$395.92
Each
units
24 V dc, 110 V ac 2 - Safety Switch/Interlock 2 - Automatic, Manual - Screw - 121mm - 87mm 45mm
RS Stock No. 893-7745
Mfr. Part No.2904958
$265.42
Each
units
24 V dc 2 2 Emergency Stop, Safety Switch/Interlock 2 PSRmini Automatic 3 Screw cUL, cULus, EAC, Functional Safety, UL 102.5mm - 93.1mm 6.8mm
RS Stock No. 893-7720
Mfr. Part No.2904951
$256.18
Each
units
24 V dc 1 1 Emergency Stop, Safety Switch/Interlock 1 PSRmini Manual 1 Screw cUL, cULus, EAC, Functional Safety, UL 102.5mm - 93.1mm 6.8mm
RS Stock No. 240-8721
Mfr. Part No.BO 5988.47/124 DC24V + AC230V 1-10s
BrandDold
$655.94
Each
units
- - - - - - - - - - - - - -
RS Stock No. 893-7739
Mfr. Part No.2904955
$265.42
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. 447-4461
Mfr. Part No.XPSMP11123
$927.27
Each
units
24 V dc 1 3 Safety Mat/Edge, Safety Switch/Interlock 6 Preventa Automatic, Monitored - - - 114mm - 99mm 45mm
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