Sadly i am only a software engineer with little electronic knowledge. I build a device with a mcu and a 5-pin connector (3.3v, Gnd, 3 data lines) on it. My mcu has a 3.3v supply pin which i connected to my 5-pin connector to supply some external sensors. Everything works fine.
My question now is there any kind of best practise to protect these external supply lines against short circuit? (The mcu is very expensive so i really want to protect it). I mean users don't always are that careful with your product than you hope. Also the product will be used outdoors.
EDIT: I realised i might have asked the wrong way. Maybe it is easier to ask the following question: Whats the common way manufactures of electronic devices with external connectors protect their devices from bad usage? (for example user attaches damaged cable)