How does the fuse holder work? Next, let's learn about the operation principle of the fuse and the voltage of the circuit.

the operation principle of the fuse

Many of the electrical equipment in car circuits are connected by wires of different colors. It can not be ignored that the function of fuses and fuses is to protect circuits (circuits) and electrical equipment. A car fuse is a current fuse. When the circuit current is more than twice the rated current of the fuse, it fuses in a few seconds, which plays the role of circuit protection. It is often used for over-current protection of automobile circuits and industrial equipment.

What is a car fuse?

The use of the car fuse is similar to that of the household fuse. When the circuit current conducts normally and exceeds its rated current, the fuse becomes the circuit protection barrier. Car fuses are roughly divided into two types: fast-melting fuses and fuse-proof fuses. Common fuses for automobiles include high current fuses and medium and low current fuses. Ordinary easy-to-contact fuses are medium and low current fuses.

Generally speaking, medium and low current insurance can be divided into chip fuse (including automatic fuse box), plug-in fuse, swirl fuse, tubular fuse box and so on. What can be contacted in these fuses is a medium ATO or a small fast fuse.

Chip fuses can withstand small current, short pulse current, such as headlamp circuit, rear glass cream and so on. The working principle of vehicle fuse, fuse has two important working parameters. One is the rated current, the other is the rated voltage, and the corresponding fuse should be selected according to the circuit current and voltage. In structure, the general automobile fuse adopts plug-in design, and the fuse has engineering plastic shell, zinc or copper melt structure, metal melt and pin connection. The performance index of the vehicle plug fuse is generally 2A~40A, and the fuse value will be marked on the top of the fuse. If the fuse burns out, so that the ampere value can not be identified, it can also be judged by its color.

International standard of plate fuse color: 2A gray, 3A purple, 4A red, 5A orange yellow, 7.5A coffee, 10A red, 15A blue, 20A yellow, 25A transparent and colorless, 30A green and 40A dark orange. The size of different amperes depends on the color, which depends on the color. Because the vehicle has a lot of parts and electronic equipment, and each equipment has a fuse, in order to facilitate the maintenance work in the future, at the beginning of the design of each car, the designer designs all the car fuses to one place, called the safe. Usually a car has two safes, one is a dry engine compartment, which is responsible for handling the fuses of the car's external appliances, such as engine controller, horn, glass cleaner, ABS, headlights, etc.: the other is located on the left side of the driver, managing the electrical equipment in the car, such as window elevators, airbags, electric seats, cigarette machines, and so on.

Circuit safety and rated voltage

When the current fuse is in use, when the current passes through the conductor, there will be a certain resistance between them, so that the conductor will heat up, and the heat generated by the current fuse must be consistent with the Q=024T2RT. In this formula, when the current flows through the conductor, the bulk attachment, 0.24 is a constant, and 0 is heat.

When electrified, the heat emitted by the fuse in the current fuse holder, the current in the normal working current or load overload current, and the heat generated by the fuse will increase the temperature of the fuse. The hot holes produced by external radiation method and external radiation method gradually reach equilibrium.

In the melting process, the melting rate can not keep up with the melting rate, so that the melting temperature gradually increases, so that the melting temperature reaches and exceeds the melting point of the molten material. Then cut off the current and maintain the safety of the circuit and the human body.

When a current fuse is used, the electrical function of the current fuse base is connected in series with the electronic circuit. Generally speaking, the resistance is low. Under normal working conditions, it is only equivalent to a wire and can be stable for a long time. When the current is oscillated under the power supply or external interference, the conduction circuit should also bear a certain overload range. In the current fuse base, when the circuit has a large overload current, the fuse can work normally and maintain the current to ensure the safety of the circuit.

In daily use, the current fuse holder is very inconspicuous, but if there is no fuse, the vehicle will become a pile of soulless iron, mainly because light bulbs, automotive appliances and other starters, air conditioners, loudspeakers are fuse protection devices, otherwise once the high-line CLP, it is possible to use electric burns.

At present, the fuse holder has two important parameters, one is the rated current, the other is the rated voltage. When in use, the corresponding fuse must be selected according to the current and voltage of the fuse. Vehicle fuses are divided into high fuses and medium-low fuses. Medium and low current fuses are commonly used in ordinary cars, and medium and low flow fuses are divided into insert fuses, bifurcated fuses, spiral fuses and tubular fuses. The commonly used contacts are small and medium-sized fast fusion plug fuses.

Vehicle fuse seat is relatively common, general vehicle medium and low voltage fuse, medium and low voltage fuse is divided into insert fuse, bifurcation fuse, spiral fuse, tubular fuse. The commonly used contacts are small and medium-sized fast fusion plug fuses.

The corresponding electronic equipment in the car fuse seat is very simple. Typically, the example diagram in the fuse box represents the electronic device responsible for each fuse. When in use, the corresponding position can only be found by matching the chart with the fuse.

The above is the introduction of "the operation principle and circuit problems of the fuse holder". We need to know more about the fuse holder, please contact our manufacturer for more information.