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I am making a SP3T switch that has PU/PD/Load. One of these is an automotive injector that would see some intermittent current with a max of 16A @ 85V.

Is it dangerous to use solder to connect this terminals together on a pcb? Is copper trace what I would need to opt for?
I am just worried about the current being too high and not really sure of solder's capability for this. I am not using a PCB designer.

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    \$\begingroup\$ Where are your thermal calculations? \$\endgroup\$ – Ignacio Vazquez-Abrams May 1 '18 at 12:09
  • \$\begingroup\$ I soldered battery cables and connections for currents greater than 800 or 1000A - they did not melt the solder - but if you have a bad or high resistance connection the situation changes... \$\endgroup\$ – Solar Mike May 1 '18 at 13:49
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High current traces must be. Wide and Short . Use Saturn’s free PCB executable tool to calculate the voltage drop per mm length for a given track width and copper weight with solder plating thickness. If excessive you may need to reinforce with short 16-24AWG wire soldered to tracks for power , ground return and drive signals. Keep loop area of all current loops to a practical minimum by every means due to switched inductive loads.

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