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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Rincian Komponen Brand Stock Supply Voltage Number of Channels Auxiliary Contacts Function Safety Contacts Range Reset Method Safety Category Terminal Type Standards Met Length Width Depth
Bernstein AG SCR 24 V dc, 230 V ac Safety Relay Single Channel Bernstein AG 3 24 V dc, 230 V ac 1 2 Two-Hand Control - - - - Screw - 22.5mm 99mm 114.5mm
Sick RLY3 30 V dc Safety Relay With 2 Safety Contacts Sick 3 30 V dc - - - 2 - Automatic, Manual Cat 4 Plug In - 18mm 85.5mm 124.6mm
Sick RLY3 30 V dc Safety Relay Dual Channel With 2 Safety Contacts Sick 2 30 V dc 2 - - 2 - Automatic, Manual Cat 4 Plug In - 18mm 85.5mm 124.6mm
Sick RLY3 30 V dc Safety Relay Dual Channel With 2 Safety Contacts Sick 2 30 V dc 2 - - 2 - - Cat 4 Plug In - 18mm 85.5mm 124.6mm
Bernstein AG SCR 24 V dc, 230 V ac Safety Relay Single Channel Bernstein AG 1 24 V dc, 230 V ac 1 3NO/NC Two-Hand Control - - - - Screw - 22.5mm 99mm 114.5mm
Bernstein AG SCR 24 V dc, 230 V ac Safety Relay Single Channel Bernstein AG 1 24 V dc, 230 V ac 1 3NO/NC Two-Hand Control - - - - Screw - 22.5mm 99mm 114.5mm
Phoenix Contact PSR-MC32 24 → 230 V ac/dc Safety Relay Dual Channel With 3 Safety Contacts Phoenix Contact 1 24 → 230 V ac/dc 2 - Emergency Stop 3 - Manual 2 Terminal Block - 117.4mm 22.5mm 114.5mm
Phoenix Contact PSR-MC82 24 V dc Safety Relay Dual Channel With 5 Safety Contacts Phoenix Contact 1 24 V dc 2 - Emergency Stop 5 - Manual 1 Terminal Block - 116.6mm 17.5mm 114.5mm
Sick RLY3 30 V dc Safety Relay Dual Channel With 2 Safety Contacts Sick 1 30 V dc 2 - Safety Monitoring 2 - - Cat 4 Plug In - 18mm 85.5mm 124.6mm
Bernstein AG SCR 24 V dc, 230 V ac Safety Relay Single Channel Bernstein AG 0 24 V dc, 230 V ac 1 2 Two-Hand Control - - - - Screw - - - -
Bernstein AG SCR 24 V dc, 230 V ac Safety Relay Single Channel Bernstein AG 0 24 V dc, 230 V ac 1 2NO/NC Two-Hand Control - - - - Screw - 22.5mm 99mm 114.5mm
Bernstein AG SCR 24 V dc, 230 V ac Safety Relay Single Channel Bernstein AG 0 24 V dc, 230 V ac 1 3 Two-Hand Control - - - - Screw - 22.5mm 99mm 114.5mm
Dold 24 V dc Safety Relay Dual Channel With 2 Safety Contacts
  • No. Stok RS 181-2780
  • Merek Dold
  • Pbrk. No. Komp. UG6980.02PS/61 DC24V
Dold 0 24 V dc 2 - - 2 - Auto Start, Manual 4, PL e 4, SIL 3 Screw - 22.5mm 120.3mm 110mm
Dold 24 V dc Safety Relay Dual Channel With 4 Safety Contacts
  • No. Stok RS 181-2779
  • Merek Dold
  • Pbrk. No. Komp. UG6970.04PS/61 DC24V
Dold 0 24 V dc 2 - - 4 - Auto Start, Manual 4, PL e 4, SIL 3 Screw - 22.5mm 120.3mm 110mm
Dold 24 V dc Safety Relay Dual Channel With 4 Safety Contacts
  • No. Stok RS 181-2781
  • Merek Dold
  • Pbrk. No. Komp. UG6980.04PS/61 DC24V
Dold 0 24 V dc 2 - - 4 - Auto Start, Manual 4, PL e 4, SIL 3 Screw - 22.5mm 120.3mm 110mm
Phoenix Contact PSR-MC60 24 V dc Safety Relay Single Channel With 2 Safety Contacts Phoenix Contact 0 24 V dc 1 - Two Hand Control 2 - Manual 1 Terminal Block - 116.6mm 12.5mm 114.5mm
Phoenix Contact PSR-MC62 24 V dc Safety Relay Dual Channel With 2 Safety Contacts Phoenix Contact 0 24 V dc 2 - Two Hand Control 2 - Manual 1 Terminal Block - 116.6mm 12.5mm 114.5mm
Phoenix Contact PSR-MC70 24 V dc Safety Relay Single Channel With 2 Safety Contacts Phoenix Contact 0 24 V dc 1 - Emergency Stop 2 - Manual 1 Terminal Block - 116.6mm 12.5mm 114.5mm
Phoenix Contact PSR-MC72 24 V dc Safety Relay Dual Channel With 2 Safety Contacts Phoenix Contact 0 24 V dc 2 - Emergency Stop 2 - Manual 1 Terminal Block DIN EN 50178 116.6mm 12.5mm 114.5mm
Phoenix Contact PSR-MM25 24 V dc Safety Relay Dual Channel With 1 Safety Contact Phoenix Contact 0 24 V dc 2 - - 1 - Manual 1 Terminal Block - 116.6mm 12.5mm 114.5mm
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