Arduino controlled relays mounted on DIN-rail

Other Hardware Motors, Mechanics, Power and CNC
1

Hi

I'm looking for a solution where I can use Arduino (mega) to control relays . My requirements are

  • 240VAC
  • DIN rail mounted
  • one or more relays in single module
  • it may require external power (to avoid buring Arduino pins) but not external elements to wire (e.g. transistors)

I did a research and I found a lot of 12V relays which need too much input power to control relay state.

Could you recommend any solution? Perhaps could you share links to existing products in online shops (ideally with worldwide delivery)

Maybe instead of looking for 5V relays there are shields which changes 5V to 12V?

Mirek

2

In general an Arduino cannot provide enough current to trigger the coil in an electro-mechanical relay even if it has a 5v coil. You would need a transistor between the Arduino and the coil.

You can certainly buy small board-mounted relays for use with Arduinos that have the necessary transistors included. Maybe something similar is available for DIN rail mounting. However I suspect most of those relays are controlled by PLCs that are able to drive regular relays.

The other option is a solid-state relay that has a TTL input.

...R

3

There are lots of 5V coil relays that run at 10 -28mA coil current and switch up to 250VAC that could be controlled by Arduino directly. These are low current versions for example, larger higher current versions are also available.

I offer 8-channel relay boards with 5A, 250A switch capability with coil current controlled by shift register in both standalone and shield format
http://www.crossroadsfencing.com/BobuinoRev17/

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The same boards could be made in DIN footprint (if you could define what that size is) and the 328P capability/relay design merged into one board, or different relays used if more current switching capability was needed. All it takes is a little money.

4

Mega version available too:

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5

Hi,
The lowest cost solution is to buy DIN-rail 'platforms' (Plastic DIN connectors with a flat surface) and Epoxy/Silicone an existing relay board that has optical isolation built in.

Example DIN Clip:

You can find lots of options HERE

Example Relay boards:

These relay boards use 5V power for the relays and draw very little from the Arduino I/O pins.
Info on these and other power-control options HERE