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What is the function of the fuse?

Release time:

Jan 12,2024

The role of the fuse: overcurrent protection and overheating protection. The fuse used for overcurrent protection is the usual fuse (also called current limiting fuse). Fuses for overheat protection are generally referred to as "temperature fuses". Temperature fuse is divided into low melting point alloy shape and temperature sensing trigger shape and memory alloy shape and so on.

The temperature fuse is to prevent the temperature of heating appliances or heating appliances from being too high, such as hair dryers, irons, rice cookers, electric stoves, transformers, motors, etc.; it responds to the increase in the temperature rise of electrical appliances. Ignore the working current of the circuit. Its working principle is different from "current limiting fuse".

fuse working principle:

1. When the current flows through the conductor, the conductor will generate heat because there is a certain resistance in the conductor. And the calorific value follows this formula: Q = 0.24I2RT; Where Q is the calorific value, 0.24 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, and T is the time for the current to flow through the conductor; According to this formula, it is not difficult to see the simple working principle of the fuse.

2. 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, and its calorific value increases with time.

3. The size of the current and resistance determines the speed of heat generation. The structure of the fuse and its installation status determine the speed of heat dissipation. If the speed of heat generation is less than the speed of heat dissipation, the fuse will not blow. If the rate of heat generation is equal to the rate of heat dissipation, it will not fuse for a long time.

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