How fuses work
The working principle of the fuse is a simple I2R versus time relationship. After the current exceeds the specified value for a period of time, the fuse uses its own heat to melt the melt, thus disconnecting the circuit. In power distribution systems, control systems and electrical equipment, fuses, as protectors for short circuits and severe overcurrent, are one of the most commonly used protection devices.
The fuse has anti-delay characteristics, that is, when the overload current is small, the fusing time is long; when the overload current is large, the fusing time is short. Therefore, within a certain overload current range, when the current returns to normal, the fuse will not blow and can continue to be used. Fuses have various fusing characteristic curves, which can adapt to the needs of different types of protection objects.
The fuse is connected in series in the circuit. When an overload or short-circuit fault occurs in the circuit or electrical equipment, the melt of the fuse melts first and cuts off the power supply to protect the circuit or electrical equipment. It is a short-circuit protection appliance.
The function of fuse
It mainly plays a role in protecting the safe operation of the circuit. A fuse is an electrical appliance that, when the current exceeds a specified value, uses the heat it generates to melt the melt and disconnect the circuit.
When a fault or abnormality occurs in a circuit, the current continues to increase, and the increased current may damage some important or valuable components in the circuit, burn the circuit or even cause a fire.
If the fuse is correctly installed in the circuit, then the fuse will blow itself and cut off the current when the current abnormally rises to a certain height and at a certain time, thereby protecting the safe operation of the circuit.
