Analysis of high-voltage DC fuse’s ageing characteristics under the overload pulse current carrying mode and the caused short-circuit failure in series-resonant converter power source

•DC1600V32A fuse ageing Mechanism and high-frequency overload pulse current carrying effect.•Four ageing stages of fuse conductor are revealed under high-frequency overload pulse current carrying.•The lifetime evaluation way of the high-frequency overload pulse fuse is put forward.•Several ways for improving the fuse conductor ageing are put forward.