The structure of the fall-off fuse mainly includes insulator, fuse tube, electrode connecting plate, static contact plate, rain cover, main pressure spring, jumper, etc. The principle is:
When the drop type fuse is in the working state, the static contact plate in the main pressure spring under the action of pressure release cap, one end of the fuse through the fuse tube body set pressure release cap, the other end through the jumper fixed on the lower electrode connecting plate in the tension state so that the fuse tube in the normal closing state. When the power system fails, the fault current will fuse quickly fused, fuse broken, the jumpers in the action of a small spring quickly reset, fuse tube body and trunnion lose tension and turn down, fuse tube body by the static contact plate on the main compression spring pressure, coupled with its own weight effect quickly fell. Among them:
1. The rain cover is arranged above the static contact sheet, and the main pressure spring is arranged between the static contact sheet and the rain cover. The rain cover plays the role of protecting the static contact sheet and the main pressure spring.
2. The side push device includes the installation column, side push elastic component and side push lock component. The side push elastic component and side push lock component are installed on the installation column. When the fuse tube falls, the trigger slot will disassemble the side push lock assembly and side push elastic assembly. Under the action of side push elastic assembly, the fuse tube will be pushed out from the side, and the electrical connection between the static contact plate and the fuse tube can be quickly broken at the moment the fuse is broken, thus cutting off the circuit and increasing the service life.
