@beginning-freak said in 15A Fuse burning out:
Resistance is 0,8/0,9 Ohm
Did you subtract the reading you get when you short the two meter leads together? That is often a significant fraction of 1 ohm.
A 15A fuse will take quite a lot more than 15A for a few minutes before it burns out. Therefore, if the fuse is burning out quickly, the bed heater is likely to be drawing more than the 18A limit of the Duet. So you should use an external SSR or mosfet switch for the bed heater. Best is the Auberin DC-DC SSR that I link to he the wiki page about bed heaters.
