General > General Technical Chat
Help me get 35 Amps onto my PCB!
Siwastaja:
AWG8 or 8...10mm^2 wire instead of busbars, and classical THT PCB mount screw connector is an option at 35A. Even a single beefy connector, or as wraper suggests, paralleled connections.
Teslacoil linked roughly what I was talking about earlier. Solid metal block versions can support even higher currents but at 35A that one is definitely OK. Can use either busbars, or crimp a simple round lug on a wire.
T3sl4co1l:
Yeah, 35A isn't all that much, it's not far above plain old 1/4" quick connects; but those run out around 20-30A so would be a bit marginal here. A bolted connection is probably a good idea but it doesn't need to be anything particularly fancy. :)
Tim
james_s:
I've used XT60 connectors with success. Those screw terminals Tim posted look like a good option too. In a pinch you can also use multiple pins in any random connector you want to use, that is commonly done with various Molex/Amp types, just use as many wires and pins connected together as you need to carry the load.
T3sl4co1l:
Mind that connectors won't generally share current perfectly -- so, in addition to the usual heating effect*, allow some extra derating -- but as you can easily pack three times as many connections in a header, this often ends up in your favor.
*Mind that most connectors are rated for only one circuit active. No heat from neighboring pins screwing things up. When they show derating for more (up to full header active), take note of how much the capacity goes down by -- it can be half (per pin) or thereabouts!
Also, ultimately it's a tradeoff for resistance, temp rise and reliability; if you really don't care, don't have any standards to meet or anything, you can run connectors way over their ratings. Just be careful that they can still carry fault current so as to clear fuses when a fault does occur!
Tim
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