Rpi3B Polyfuse

Does Raspberry Pi 3B have polyfuse? Can USB ports blow polyfuse? [duplicate]

Ask QuestionAsked todayActive todayViewed 20 times2This question already has an answer here:Where is the Polyfuse of Raspberry Pi3? (1 answer)

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Closed 10 hours ago by joangoldilocks.

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Does Raspberry Pi 3b have polyfuse? If it does, under what conditions can it be ‘blown’? I suspect my RPi 3b polyfuse to be blown, but I don’t know what’s causing it. I’m using an external HDD for booting into DietPi with its own power supply and after every day or so all the USB ports have no power hence RPi doesn’t boot (but boots okay with SD card).

Can someone suggest why this happens and how I can prevent this from happening again?
Also, if this keeps happening will the RPi get bricked? Thank you!pi-3powerpower-supplyboot-issuesusb-powerShareEditFollowReopenFlagedited 10 hours agoasked 13 hours agoKiran3133 bronze badges New contributorAdd a comment

2 Answers



Does Raspberry Rpi3B have polyfuse?


Yes, and if it is blown, you can replace it.

replace polyfuse


(1) If Rpi3B’s polyfuse is blown, Can I save it?

(2) Rpi3B+ Power Circuit Analysis – James Adams, rpi.org, 2018apr11


Appendix A – Rpi Polyfuse Schematic

polyfuse schematic

Appendix B – Rpi3B Polyfuse

rpi3b polyfuse

ShareEditDeleteFlagedited 12 hours agoanswered 12 hours agotlfong013,69233 gold badges88 silver badges2222 bronze badgesAdd a comment3

The Pi3 has a 2.5A polyfuse. It will “”blow” if you pull more than 2.5A from the power supply. If you keep overloading it the fuse will eventually fail.ShareEditFollowFlaganswered 13 hours agoMilliways48.5k2323 gold badges8080 silver badges160160 bronze badgesAdd a comment

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