7

The question says it all. If you have a definite answer, it would be great if you could post a photo of the pi zero, where the fuse is pointed out.

  • Questions are not for answers – Christian Feb 1 '17 at 12:03
  • OK, should I create a new answer from it, and remove the answer? I am not sure. – Stowoda Feb 1 '17 at 15:54
  • It is entierly valid to answer your own question. It would be even better to edit the current answer, since you got the info there, but you might be a tad low on reputation. – Christian Feb 1 '17 at 15:57
  • OK; I just moved it into the answer part. Thanks for the hint. – Stowoda Feb 1 '17 at 16:04
  • This looks much better and readable. Nice job – Christian Feb 1 '17 at 16:06
9

The Pi Zero does not have a fuse (polyfuse or otherwise).

See this Raspberry Pi org forum post.

Also see these limited schematics.

9

NO polyfuse for raspberry pi zero

Thanks to Joan I got the information to complete this request. Here are the schematics for the power supply of both raspberry pi Zero and PRI 3, .

Raspberry Pi Zero without fuse:

enter image description here

And Here for comparision RPI3 with polyfuse:

enter image description here

  • So: on the bright side the RPi Zero is not going to suffer from volt-drop to the same extent when power is drawn from the +5V pins on the GPIO connections...! – SlySven Jul 11 '17 at 15:34
3

It does not have a polyfuse, but good fuses are cheap. If you want a fuse, use a nice glass fuse: fuse1

Or a tiny fuse: fuse2

To check if you've popped it, just use an ohm measurement. You also do not have to waste a day or more praying that your polyfuse has saved you.

Or add your own polyfuse: fuse3

  • Of course you will have to use the right fuse (for a fuse of current rating Iₙ you will need to draw at least 2 * Iₙ and possibly more to get it to fuse in a reasonable time) and as far as semiconductor equipment with a glass/ceramic fuse you can often find that the circuit will work fine without any of that nasty volt-drop associated with poly-fuses - it is just that in the event of an over-voltage or down-stream overload the semiconductors protect the fuse by burning out in an open-circuit manner so as to not cause the fuse to blow... 8-P – SlySven Oct 24 '17 at 0:06
  • @SlySven Yes, a fast fuse. The right fuse. I like glass-case fuses in proper fuse mountings. Polyfuses are silly. – user2497 Oct 24 '17 at 0:08

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