Drop type fuse the main structure is made up of insulation support, open fuse (fuse) composed of two parts, the fuse is vulcanized fiber tube, shellac'll such as mulberry paper left materials. The working principle of the drop fuse is described as follows.
The moving contacts at both ends of the fuse tube rely on the fuse (melt) to fasten, the upper moving contact is pushed into the "duck mouth" protruding part, the top of the static contact head made of phosphorous copper sheet moves the contact head, so the fuse tube is firmly stuck in the upper "duck mouth" inside; When the short circuit current is blown through the fuse, the steel tube lining the fuse tube will produce a lot of gas under the action of electric arc. Because the top of the fuse tube is sealed, the gas is sprayed to the bottom end and blows out the arc; Because the fuse is blown, the upper and lower contacts of the fuse tube lose the fastening force of the fuse. Under the action of the gravity of the fuse tube itself and the upper and lower static contact spring, the fuse tube descends rapidly, disconnecting the circuit and cutting off the line or faulty equipment in the faulty section.
