sorry for that newbie question: I do understand, what a polyfuse is. But I don't know, whether I can use the RemotePi-Board I bought for my RPi Model 2 B V1.1. I am using the official Raspberry Pi power supply (it's rated 2.5A, as far as I know).
I want to know, whether I can safely use that board on my RPi Model 2 B V1.1 and what they mean by "limits the short circuit current" - what could go wrong, is this a fire hazard issue or could I fry my USB-Harddrive, that is directly attached to the USB ports with max_usb_current=1
On their compatibility website, they say about the RemotePi board (I only could by the Board for the PI3, the PI2-Version was not available)
So: can you kindly tell me in layman terms, if this is in any way a fire hazard or frying my HDD issue - or what are the dangers here?The RemotePi Board for Pi2 and B+ is almost identical to the RemotePi Board for Pi 3, the only difference being that the built-in polyfuse has a different value to mirror the value of the polyfuse on the Raspberry Pi. The RemotePi Board for Pi2 and B+ has a 2.0 A polyfuse while the RemotePi Board for Pi3 has a 2.6 A polyfuse.
Despite the different polyfuse value, it is possible to use the RemotePi Board for Pi 3 and Pi 3 B+ on a Raspberry Pi 2, Pi 1 B+ or A+ as well, but this is only recommended, if the power supply limits the short circuit current. In case of a short circuit the 2.6 A polyfuse on the RemotePi Board would allow for a higher current draw than the Raspberry Pi 2, Pi 1 B+ or A+ were designed for.
If the power supply already limits the current (most power supplies have a built-in overcurrent protection), then it would be no issue to use the RemotePi Board for Pi 3 and Pi 3 B+ on a Raspberry Pi 2, Pi 1 B+ or A+.