The function of fuse

A fuse is an electrical device that automatically blows when the circuit current is too large to protect equipment and prevent fires. Its functions include: preventing overload current and cutting off the circuit. Prevent short-circuit current and prevent high current from damaging equipment or causing fire. Limit fault current and protect equipment. Isolate faulty circuits to prevent fault spread.

The role of fuse

The fuse is an electrical safety device. When the current in the circuit exceeds the set Automatically fuses when set, thus cutting off the circuit and preventing electrical equipment or fire hazards.

Specific function:

• Prevent overload current:When the current in the circuit exceeds the rated current of the fuse, the The fuse will blow, cutting off the circuit.
• Prevent short-circuit current: Short circuit means that current flows in a path other than the normal path, causing a significant decrease in circuit impedance and a sharp increase in current. Fuses can blow quickly to prevent high currents from damaging equipment or causing fires.
• Limit fault current: When a fault occurs, the fuse can limit the amplitude and duration of the fault current, thereby protecting the equipment.
• Isolate the faulty circuit: After the fuse blows, the faulty circuit will be isolated from other circuits to prevent the fault from spreading to the entire electrical system.

Working principle:

A fuse is usually composed of a long, thin metal wire (fuse) embedded in a glass or ceramic casing. . When current flows through a fuse, it generates heat. If the current exceeds the fuse's rating, the fuse will melt quickly, breaking the circuit.

Select a fuse:

You need to consider the following factors when selecting a fuse:

• Rated current: Fusing The rated current of the device should be slightly higher than the normal operating current of the circuit, but lower than the maximum safe current of the device.
• Type: There are different types of fuses, including fast fuses, slow fuses, low voltage fuses and high voltage fuses.
• Voltage Rating: The fuse should have a voltage rating that matches the voltage rating of the circuit.

The above is the detailed content of The function of fuse. For more information, please follow other related articles on the PHP Chinese website!