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. 176-0008
Mfr. Part No.2TLA010070R0000
BrandABB Jokab
$493.13
Each
units
24 V dc 5 3NO/NC Safety Switch 4 Sentry Multi-Reset 4 Screw - 120mm - 22.5mm 120mm
RS Stock No. 324-7280
Mfr. Part No.774325
BrandPilz
$479.61
Each
units
24 V ac/dc 1, 2 - Safety Switch/Interlock 2 PNOZ X - - Screw - 121mm - 87mm 22.5mm
RS Stock No. 191-9872
Mfr. Part No.751185
BrandPilz
$697.02
Each
units
24 V dc 2 - - 2 PNOZ s5 Automatic, Manual 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 181-2781
Mfr. Part No.UG6980.04PS/61 DC24V
BrandDold
$526.62
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. 549-570
Mfr. Part No.G9SB200DACDC24
BrandOmron
$303.24
Each
units
24 V ac/dc 2 - Emergency Stop 2 - Manual - - - 112mm - 100mm 18mm
RS Stock No. 741-8635
Mfr. Part No.SRB201ZH-24VDC
BrandSchmersal
$626.22
Each
units
24 V dc 2 2 Safety Switch/Interlock 3 PROTECT - - - - 121mm - 100mm 22.5mm
RS Stock No. 362-0174
Mfr. Part No.774350
BrandPilz
$852.81
Each
units
24 V dc 2 1 Two-Hand Control 2 PNOZ X Monitored - Screw - 121mm - 87mm 22.5mm
RS Stock No. 814-6933
Mfr. Part No.XPSAR311144P
$1,003.51
Each
units
24 V ac/dc 2 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 7 Preventa Monitored - Screw - 114mm - 99mm 90mm
RS Stock No. 814-6927
Mfr. Part No.XPSAC5121P
$363.75
Each
units
24 V ac/dc 1 1 Emergency Stop, Safety Switch/Interlock 3 Preventa Monitored - Screw - 114mm - 99mm 22.5mm
RS Stock No. 146-5868
Mfr. Part No.SRB-E-301ST
BrandSchmersal
$541.14
Each
units
24 V ac/dc 1, 2 1 - - - Automatic - Plug In, Screw - 98mm - 22.5mm 115mm
RS Stock No. 191-9870
Mfr. Part No.751177
BrandPilz
$369.60
Each
units
24 V dc 2 1 Expansion Module 4 PNOZ s7.2 Automatic 4 Cage Clamp - 120mm - 98mm 17.5mm
RS Stock No. 191-9864
Mfr. Part No.751134
BrandPilz
$511.10
Each
units
48 → 240 V ac/dc 2 1 - 3 PNOZ s5 Automatic, Manual 4 Cage Clamp - 120mm - 98mm 22.5mm
RS Stock No. 784-5784
Mfr. Part No.3SK1111-1AW20
BrandSiemens
$474.86
Each
units
110 → 240 V ac/dc 1 - - 4 SIRIUS Automatic, Monitored - Screw - 121.7mm - 100mm 22.5mm
RS Stock No. 177-4036
Mfr. Part No.2700575
$447.79
Each
units
24 V dc 2 - Two Hand Control 2 - Manual 1 Terminal Block - 114.5mm - 116.6mm 12.5mm
RS Stock No. 733-2341
Mfr. Part No.2TLA010026R0000
BrandABB
$594.84
Each
units
24 V dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 - - - Terminal Block - 120mm - 84mm 45mm
RS Stock No. 498-937
Mfr. Part No.3RK1205-0BG00-0AA2
BrandSiemens
$318.30
Each
units
26.5 → 31.5 V dc - - - 2 SIRIUS - - Cage Clamp - 91mm - 90mm 22.5mm
RS Stock No. 741-8653
Mfr. Part No.SRB301ST-24V-(V.2)
BrandSchmersal
$805.26
Each
units
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - PROTECT - - Screw - 121mm - 100mm 22.5mm
RS Stock No. 190-8413
Mfr. Part No.2702524
$291.16
Each
units
24 V dc 2 - - 1 - - SIL 3 Screw - 93.1mm ATEX, IECEx 6.8mm 102.5mm
RS Stock No. 240-8793
Mfr. Part No.BD5980N.02 DC24V
BrandDold
$583.83
Each
units
24 V dc 2 - Two-Hand Control 2 Safemaster - - Screw - 121mm - 74mm 45mm
New
RS Stock No. 200-6142
Mfr. Part No.XPSUS32AC
$851.62
Each
units
48 to230 V 2 - Emergency Stop 2 - - - - - - - - -
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