I bought a dph3205 module and I see that it has 2 inputs (2+ and 2-). What will be the point for this?

What it will happen if I connect both inputs from different sources?

enter image description here Thanks

  • 2
    \$\begingroup\$ To double the ampacity of the connector. \$\endgroup\$ Apr 29, 2018 at 10:40
  • 2
    \$\begingroup\$ You will make a short circuit. This module has only one input and one output. \$\endgroup\$
    – G36
    Apr 29, 2018 at 10:41

1 Answer 1


To elaborate on what people have already said in the comments, it's not really two inputs; rather, it's one input with two connections to it.

There's a simple reason for doing this: Any connector is going to be rated for a certain amount of current, probably somewhere on the order of 5~10 A for a terminal block like that. If you want to have a 20 A input or output, it's often easier and cheaper to just use multiple contacts on your connector rather than get a larger (and more expensive) single connector. Likewise, wires have current ratings as well, and you might want to use two smaller wires rather than one larger one.

The two IN+ contacts are shorted together on the board, or possibly even inside the connector, so if you try to connect two different power supplies to them you'll be putting the power supplies in parallel. Unless your supplies are made for that and you know what you're doing, don't do that. Likewise for the IN-, OUT+, and OUT- contacts.


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