When the melt is blown, carefully analyze the cause of the fuse. The possible reasons are:
(1) Normal fuse due to short-circuit fault or overload operation.
(2) The melt has been used for too long, and the melt has been accidentally cut due to the change of melt characteristics due to oxidation or high temperature during operation.
(3) There is mechanical damage when the melt is installed, which reduces the cross-sectional area and causes false disconnection during operation.
