What 2 condition cause dual element fuse to blow?

A dual element fuse typically blows due to two primary conditions: an overload and a short circuit. The overload condition occurs when the current exceeds the fuse's rated limit for an extended period, causing the fuse element to heat up and melt. In contrast, a short circuit generates a sudden surge of current, which leads to rapid heating and immediate melting of the fuse element. Both conditions protect electrical circuits from damage by interrupting the flow of electricity.