I have a lot of low current devices in need of 5V or 12V power. So far I have been using cable connectors like this:
The problem is that by "a lot" I am talking about 15-20 devices consuming only a few milliamperes. As you can imagine this is starting to take a lot (too much) space when using those cable connectors.
I am now planning to use an empty PCB breakout like this:
and solder a GPIO header onto it. Then I am going to solder all the pins of the GPIO header together using a thick naked copper strand thus providing me a lot of connection points to take power from.
Now my question is, what are those GPIO headers normally rated for? The pin pair that I will be using to supply the power/ground will ultimately have to handle the sum of all devices. The power source is not intended to supply much more than 3A and has built-in overcurrent protection that should trigger at around 3.3A. Since the raspberry pi can also be powered from the GPIO 5V pin which is using the same type of connector I am assuming 3A should probably not exceed the rating, however "assuming" is never good. I was not really successful in finding anything official for those headers since whatever I am searching just shows information about either arduino or r-pi ratings.
Maybe important: I am not using the typical GPIO 26 AWG cables to supply the power, its 18 AWG cables.
Just for completeness what I mean by GPIO header: