Increased Fuse Contact Resistance Leads To Localized High Temperature And Circuit Breakage.

As a core component of overcurrent protection devices, the operating status of the drop out fuse is directly related to equipment safety and system stability. In fact, changes in contact resistance significantly impact the thermal behavior of fuses. Increased contact resistance generates localized heat at the contact point. This heat cannot be quickly conducted away and accumulates in the fuse and its connections.

Due to factors such as uneven contact surfaces, the presence of oxide layers, or loose bolts, the resistance at the connection point may exceed the design value. When current flows, energy is released proportionally to the square of the current, manifesting as a localized temperature rise. Prolonged temperature rise alters the resistivity of the metal material, making an initially stable connection increasingly unstable and creating conditions for heat accumulation.