Comment by jinzo
9 hours ago
This is a pyrofuse, it does not blow with overcurrent as regular fuse, but blows in the same way airbags blow - when detecting a crash. We can debate if they blow too quick, but if you are designing this system - where and truly lives can be in danger, you would probably err on the side of caution too.
The problem is not that the pyrofuse blows. Safer to be paranoid when it's the the battery pack. The insanity is what it takes to replace it, including throwing away perfectly good parts because of the anti-theft protections.
Pyrofuse will definitely blow on overcurrent.
Usually not by itself though, and if it does that makes it a hybrid fuse, one that has both a pyrotechnical disconnector and a thermal/overcurrent one.