The Introduction to Car Fuse

Author: Release time:2023-02-08 Source: Font: Big Middle Small View count:246

Ⅰ. What is a Fuse

 

A fuse is also called a current fuse, which is defined as a "fuse-link" in IEC127 standard. Its main function is to protect against overload. When a fuse is properly placed in a circuit, it will blow itself to cut off the current when the current rises abnormally to a certain height and heat, which protects the safe operation of the circuit.


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What is an Automotive Fuse

 

An automotive fuse is a type of current fuse that blows when the circuit current abnormally exceeds its rated current to protect the circuit.

 

It is often used for overcurrent protection of automobile circuits and also for overcurrent protection of industrial equipment. There are many electric devices in the car circuit connected by different colored wires, and the most important one should be fuse. Fuse is the customary name, but the national standard is called fuse. The role of the fuse is to protect the circuit (line) and electrical equipment from short circuit, overload fault and overheating damage, and even fire.

 

Ⅱ. Automotive Fuse Types, Models and Specifications

 

2.1 Introduction of Car Fuse Type and Specification

 

There are two important working parameters of fuse, one is the rated current and the other is the rated voltage, when you use it, you should choose the corresponding fuse according to the current and voltage of the circuit.

 

In terms of structure, the general car fuse is of plug-in design, where the fuse has an engineering plastic shell wrapped with a fuse structure made of zinc or copper, and the metal fuse is connected to the plug.

 

The conductor inside the automotive fuse is made of a metal similar to solder. It has a lower melting point than the ordinary conductor itself. The size of this conductor is calibrated very precisely so that when the rated current is reached, enough heat can be generated to fuse this conductor and break the circuit.

 

There are two important operating parameters for fuses, one is the operating voltage and the other is the rated current, and car owners should choose according to the voltage and current in the circuit when purchasing or replacing them.

 

2.2 What are the Specifications of Car Fuse Models?

 

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1. Insert fuse

 plug-in fuse.png

Super small plug-in fuse, small car fuse, medium car fuse, large car fuse plug-in fuse rated current has 1-40 amps (A) to large 30-120 amps (A), rated voltage 32 volts (V).

 

2. Fork plug fuse

 fork  plug  fuse.jpg

The fuse can be divided into small fuse and large fuse. The rated current of the fuse is 30-150A(A) to 40-800A(A), rated voltage 32/125V(V).

 

3. Automotive glass tube fuse

 automotive glass tube fuse.jpg

Auto glass tube fuse can be divided into: 6.35x30mm glass tube fuse, 6.35x31.75mm glass tube fuse, 10x38mm glass tube fuse.

 

The rated current of glass tube fuse is 0.5-20 amps(A) to 10x38mm 20-80 amps(A), rated voltage 32 volts(V).

 


Ⅲ. Six Reasons and Solutions for Car Fuse Blowing

 

1. Washing the car with water to rinse the engine compartment, resulting in a short circuit. When cleaning the engine compartment, because the fuse box is not sealed, if the fuse box is flushed with water directly, it is very easy to cause a short circuit of the fuse and the whole car electrical components failure.

 

Solution: Do not flush the engine compartment directly with water.

 

2. Corresponding to the vehicle function has a problem, resulting in insurance burnout.

 

Solution: go to the 4S repair shop to repair.

 

3. Modify the vehicle audio and headlights when the power is too large. High-powered audio may also blow the fuse.

 

Solution: When installing high-power appliances, be sure to pay attention to the current and immediately replace the corresponding fuse.

 

4. The circuit or appliance behind the fuse is burnt out or the appliance behind the fuse is malfunctioning, resulting in increased power consumption.

 

Solution: Go to the repair shop to repair.

 

5. The appliance behind the fuse starts frequently, i.e., the frequency of starting and stopping when working is higher than normal appliances. Especially for motor-driven appliances, the starting current is high and frequent starting may cause the fuse to blow.

 

Solution: Try not to start the appliances frequently.

 

6. Use high-power appliances such as cigarette lighters, cigarette lighter fuses are very easy to blow. General lighter with 15-25A fuse. Because the vehicle voltage is 12V, it is recommended that the cigarette lighter connected appliances do not exceed 300W, and some small cars do not exceed 200W.

 

Solution: Use less high-power appliances.

 

Ⅳ. FAQs about Car Fuses

 

Q1. What is the size of car fuses in general?

 

The fuse tools in cars are not big, between 1.5~3A. In terms of shape and size, medium-sized ones are currently used more often, while small ones are developing well and may exceed medium-sized ones in the future.

 

Q2. What are the precautions for car fuses?

 

1. Replace the fuse according to the rated current value stated on the fuse box cover, and do not change to a fuse with a higher current than the rated one.


2. If the new fuse blows immediately, it means that the circuit system may be faulty and should be checked as soon as possible.


3. In the absence of a spare fuse. In case of emergency, you can replace the fuse on other equipment that does not affect driving and safety instead


4. If you can't find a fuse with the same current load, you can use one with a lower current rating than the original fuse instead.

 

Q3. How do I know if a fuse has blown in my car?

 

1. The best and easiest way is to use a multimeter.


2. Use an electric pencil and a fuse in the middle with a pair of pliers. -The head touches the fire wire, and the other one is measured with the electric pen. If the electric pen lights up, it is normal. If not, it is bad.


3. It also depends on what kind of fuse you are. If it is ordinary, use the electric pen to know. If it is closed, check the lower end with an electric pen.


4. If there is electricity in both fuses, the fuse on the zero line is bad. If there is no electricity, the firewire is broken. Of course. This is the 220V electrical conditions under the charged test, with 380V electricity will not work.

 

 


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