What are the safety precautions of fuse?

Frequently Asked Questions about Fuses

Fuses are a very important protective measure in electrical circuits, responsible for cutting off the circuit when the current is too high to avoid safety hazards such as electrical damage or fire.

Question 1: What should I do if a fuse burns out?

After the fuse burns out, it is necessary to identify the cause and carry out corresponding repairs. Generally speaking, there are several reasons for a fuse to break:

1. Electrical overload: If the power of the electrical appliance exceeds the rated power of the fuse, it will cause the fuse to overload and burn out.

2. Short circuit: If there is a short circuit in the circuit, the current will rapidly increase, causing the fuse to blow.

3. Overvoltage: If the circuit voltage is too high, it can also cause the fuse to blow.

For the above issues, we should handle them separately:

1. In the case of electrical overload, it is necessary to consider replacing a fuse with a higher power or reducing the power used by the appliance to prevent fuse overload.

2. For short circuits, it is necessary to check for any wiring errors or short circuits in the circuit and promptly eliminate the problem.

3. In the case of overvoltage, it is necessary to consider adding overvoltage protection devices in the circuit or adjusting the power supply voltage to reduce the working pressure of the circuit.

Question 2: How to choose a suitable fuse?

Choosing a suitable fuse requires considering the following factors:

1. Rated voltage: The rated voltage of the fuse should be equal to or slightly higher than the working voltage of the circuit to ensure the stability of the circuit.

2. Rated current: The rated current of a fuse should be selected based on the power and operating current of the appliance to ensure its normal operation.

3. Specification and size: The specification and size of the fuse need to match the installation space of the electrical appliance to ensure convenient and stable installation.

4. Working environment: Different fuses are suitable for different working environments, such as high temperature, humidity, corrosion, etc., and need to be selected according to the actual situation.

Question 3: How to install a fuse?

Attention should be paid to the following issues when installing fuses:

1. Choose the correct fuse specifications and sizes to ensure compatibility with the electrical installation space.

Before installing the fuse, it is necessary to cut off the power supply to ensure safety.

When installing fuses, it is necessary to ensure that all wiring is correct and securely fastened to avoid malfunctions

After installation, it is necessary to reconnect the power supply for testing and maintain observation to ensure that the electrical appliances are working properly.

Question 4: How to troubleshoot fuse faults?

For fuse faults, careful investigation is required to identify the cause of the fault:

1. Firstly, it is necessary to check whether the fuse is burnt out and whether there are any issues with poor contact.

2. For blown fuses, it is necessary to identify the cause of the malfunction, such as electrical overload, short circuit, etc.

3. For fuses with poor contact, it is necessary to check whether the wiring is correct and whether they are securely fastened.

4. For constantly burning fuses, it is necessary to check whether the electrical appliances are working properly, whether there are circuit short circuits and other problems, and repair them in a timely manner.

Inspection method for fuses

A fuse is a common electrical component that serves as a protective device in a circuit. When an overcurrent or short circuit occurs in the circuit, the fuse will automatically disconnect to protect the safety of the circuit and equipment. Therefore, it is very important to regularly check the working status of fuses. Below are several common methods for checking fuses

1.The first method is visual inspection.

 Firstly, it is necessary to turn off the power and unplug the plug, then open the casing of the electrical equipment and locate the location of the fuse. Gently unscrew the fuse by hand and check if there is any obvious burning or breakage on the appearance of the fuse. If the appearance of the fuse is normal, you can use a multimeter to check whether the positive value of the fuse is within normal range. If the resistance value of the fuse is infinite, it indicates that the fuse has been disconnected and needs to be replaced with a new one.

2.The second method is to use a fuse tester.

 A fuse tester is a specialized tool for detecting fuses, which can quickly and accurately detect the resistance value and working status of fuses. When using a fuse tester, it is necessary to clamp the two pliers of the tester on both ends of the fuse, and then press the test button. The tester will automatically display the resistance value and working status of the fuse. If the resistance value of the fuse is within the normal range, it indicates that the fuse is working properly. Otherwise, a new fuse needs to be replaced.

3.The third method is to use a thermal imager. 

A thermal imager is a tool that can detect the temperature of electrical equipment, which can help us quickly identify faults in electrical equipment. When using a thermal imager to detect a fuse, it is necessary to align the thermal imager with the fuse and observe the temperature change of the fuse. If the temperature of the fuse is abnormally high, it indicates that there is overcurrent or short circuit in the fuse, and a new fuse needs to be replaced in a timely manner.

Fuses are a very important protective measure in electrical circuits, responsible for cutting off the circuit when the current is too high to avoid safety hazards such as electrical damage or fire.