Horn gap fuse unit 11kv will be fixed to appropriate outside buildings. It sets must be sturdy because they will be exposed to atmospheric conditions. Two horn-shaped electrodes create an arc gap, which causes the arc to self-extinguish. As a result of its simplicity, it is utilised on low voltage lines. Horn gap fuse unit 11kv has two metal objects with horn-like shading. These two are joined in a shunt between each conductor and earth, separated from one another by a tiny air gap. The ideal distance should exist between the two electrodes. The air in this space ionises when a fault current passes across it.