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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Omschrijving Prijs Supply Voltage Number of Channels Auxiliary Contacts Function Safety Category ISO 13849-1 SIL IEC 61508 PL ISO 13849-1 Safety Contacts Range Reset Method Safety Category Terminal Type Standards Met Configurable
RS-stocknr. 271-518
FabrikantnummerUE403-A0930
FabrikantSick
€ 296,00
Each
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 492-4972
FabrikantnummerUE401-A0010
FabrikantSick
€ 443,00
Each
Aantal stuks
28.8 V dc - - Light Beam/Curtain - - - - - - - Screw - -
RS-stocknr. 180-6090
FabrikantnummerRLY3-OSSD2
FabrikantSick
€ 183,00
Each
Aantal stuks
30 V dc - - - - - - 2 - Automatic, Manual Cat 4 Plug In - -
Nieuw
RS-stocknr. 213-3796
FabrikantnummerRLY3-OSSD400
FabrikantSick
€ 132,00
Each
Aantal stuks
16.8 → 30 V 2 1 - - - - 4 RELY3 - CAT 4, PL e, SIL3 Front Connector With Spring Terminals - -
Nieuw
RS-stocknr. 213-3794
FabrikantnummerRLY3-EMSS300
FabrikantSick
€ 162,00
Each
Aantal stuks
16.8 → 30 V 2 5 - - - - 3 RELY3 Automatic & Manual CAT 4, PL e, SIL3 Front Connector With Spring Terminals - -
Nieuw
RS-stocknr. 213-3797
FabrikantnummerRLY3-TIME100
FabrikantSick
€ 284,00
Each
Aantal stuks
16.8 → 30 V 2 6 - - - - 2 RELY3 Automatic & Manual CAT 4, PL e, SIL3 Front Connector With Spring Terminals - -
RS-stocknr. 180-6091
FabrikantnummerRLY3-EMSS1
FabrikantSick
€ 142,00
Each
Aantal stuks
30 V dc 2 - - - - - 2 - Automatic, Manual Cat 4 Plug In - -
RS-stocknr. 180-6088
FabrikantnummerRLY3-OSSD1
FabrikantSick
€ 91,50
Each
Aantal stuks
30 V dc 2 - Safety Monitoring - - - 2 - - Cat 4 Plug In - -
Nieuw
RS-stocknr. 213-3795
FabrikantnummerRLY3-OSSD300
FabrikantSick
€ 203,00
Each
Aantal stuks
16.8 → 30 V 2 3 - - - - 3 RELY3 Automatic & Manual CAT 4, PL e, SIL3 Front Connector With Spring Terminals - -
RS-stocknr. 180-6092
FabrikantnummerRLY3-HAND1
FabrikantSick
€ 183,00
Each
Aantal stuks
30 V dc 2 - - - - - 2 - - Cat 4 Plug In - -