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Does anybody know the model used. Or have done tests to determine at what current load the polyfuse starts kicking in?

I want to work out how much current I can draw via the GPIO power pins.

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The recommended power supply is 5.1 volts and 2.5 amps for the Pi3. One assumes the polyfuse must have been increased to allow 2.5 amps to flow.

See https://www.raspberrypi.org/blog/#raspberry-pi-3-on-sale

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    There is now a Schematic for the Pi3 on the Foundation website which shows the fuse is MF-MSMF250/X
    – Milliways
    Apr 8, 2016 at 0:53

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