# High current on PCB to through hole connector

If I have a though-hole connector with 3.5mm pin spacing and the manufacture rates it for 14 amps per contact, how am I supposed to safely carry anywhere near that current over the PCB? Specifically, say 10A?

According to various online calculators, with a 2oz/ft^2 copper thickness, 25c ambient, 10c rise, etc, I need 3.6mm traces, which seems physically impossible. Also the 25c ambient seems to be rather lower than the device I'm working on would likely be used at (35c ambient seems more likely). I see elsewhere that the 10c temperature rise is likely to be too conservative, but I don't know what would be acceptable given my higher ambients.

What are the normal tricks that would be expected to get higher current to connectors with pin spacing that aren't wide enough for what typical online calculators recommend?

The connector is rated for 400V and the relay on the other side of the trace is rated for 300V, but I would probably only be doing 24-36V over it.

• Using traces on both sides of the board can help Jun 4, 2019 at 20:56
• Can you use a polygon or plane? Jun 4, 2019 at 20:59
• What is your voltage? Jun 4, 2019 at 21:02
• Do read electronics.stackexchange.com/questions/110972/…. With 'only' 35°C ambient, you can allow for more than 10°C I would think Jun 4, 2019 at 21:09
• BTW, the connector contacts themselves will also have quite some temperature rise when carrying 10A, way more than 10°C. And that heat will be conducted into the PCB as well. So, even with huge traces/polygons, the PCB will heat up, more than the calculated 10°C in OP. Jun 4, 2019 at 21:17