Drop Out Fuse/Cutout Switch

Drop out fuse switch refers to an electrical appliance that blows the melt and disconnects the circuit with the heat generated by itself when the current exceeds the specified value. The fuse is based on the current exceeding the specified value for a period of time, with its own generated heat to melt the melt, so that the circuit is disconnected; A current protector is made using this principle. Fuses are widely used in high and low-voltage distribution systems and control systems and electrical equipment, as a protector of short circuits and overcurrent, and are one of the most widely used protection devices.

How to Select the Right Drop Out Fuse Cutout Switch

Drop Out Fuse Cutout Switch Working Principle

When the material and shape of the fuse are determined, its resistance R is relatively determined (if its resistance temperature coefficient is not considered). When current flows through it, it heats up, which increases over time. The size of the current and resistance determines the speed of heat generation, and the structure of the fuse and its installation condition determine the speed of heat dissipation; if the speed of heat generation is lower than the speed of heat dissipation, the fuse will not blow;

If When the speed of heat generation is equal to the speed of heat dissipation, it will not melt for a long time; if the speed of heat generation is greater than the speed of heat dissipation, then more and more heat will be generated, and because It has a certain specific heat and quality, and the increase of its heat is reflected in the increase of temperature. When the temperature rises above the melting point of the fuse, the fuse will blow. This is the working principle of the low fuse.