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Common types of fuse
- Feb 07, 2018 -

Plug-in fuse: it is often used in the end of the line of 380V and below voltage grade, as a short circuit protection for distribution feeder or electrical equipment.

Spiral fuse: melt the top covered in a fuse indicator, once the melt fuse, indicator pop-up immediately, can be observed through the porcelain glass hole on the cap, it is often used in machine tool electrical control equipment. Screw type fuse. With a large breaking current, it can be used for short circuit protection in a circuit with a voltage level of 500V and below and current level of 200A.

Enclosed fuse: the enclosed fuse is divided into two types: packing fuse and non-packing fuse, as shown in FIG. 3 and FIG. 4. The packing fuse is usually square ceramic tube with quartz sand and melt inside, and it has a strong breaking capacity. It is used in the circuit with the voltage level below 500V and the current level below 1KA. The non-packed sealed fuse will load the melt into a closed cylinder. The breaking capacity is slightly smaller, and it is used for 500V below and below 600A power network or power distribution equipment.

Fast fuse: the fast fuse is mainly used for short circuit protection of semiconductor rectifier or rectifier. The overload capacity of semiconductor components is low. It can only withstand a large overload current in a very short period of time. Therefore, short circuit protection has the ability of fast fusing. The structure of the fast fuse is basically the same as that of the packing enclosed fuse, but the melt material and the shape are different, it is made of silver plate with the v-shaped deep groove of the variable section melt.

Self - complex fuse: using metal sodium as melt, with high conductivity at normal temperature. When short-circuit fault occurs in the circuit, the short circuit current produces high temperature and the sodium is rapidly vaporized, and the vapor state sodium presents a high resistance state, thus limiting the short-circuit current. When the short circuit current disappears, the temperature drops and the metal sodium restores the original good conductivity. The self - complex fuse can only limit the short circuit current, can not really break the circuit. The advantage is that you do not need to replace the melt, which can be reused.