Basic knowledge of fuses
What is the role of the fuse?
A fuse is also called a fuse. The 1EC127 standard defines it as a “fuse-link.” It is an electrical component that is installed in a circuit to ensure safe operation of the circuit. The function of the fuse is: when the circuit fails or In the case of an abnormality, the current is constantly rising, and the increased current may damage some important devices or valuable components in the circuit, or it may burn the circuit or even cause a fire. If the fuse is properly placed in the circuit, then the fuse is When the current abnormally rises to a certain height and a certain temperature, the fuse is cut off by itself, thereby protecting the safe operation of the circuit.
The earliest fuse was invented by Edison more than a hundred years ago. Because the industrial technology was not developed at the time and the incandescent lamp was very expensive, it was originally used to protect expensive incandescent lamps. How do you understand the rated voltage of a fuse? The fuse is blown or not depending on the amount of current flowing through it, regardless of the operating voltage of the circuit. The rated voltage of the fuse is derived from the point of safe use of the fuse, which is the highest operating voltage of the circuit in which the fuse is in safe operation. This means that the fuse can only be placed in a circuit where the operating voltage is less than or equal to the rated voltage of the fuse. Only in this way can the fuse work safely and effectively, otherwise, the phenomenon of continuous arcing and voltage breakdown will endanger the circuit when the fuse is blown.
The voltage drop of the fuse is illustrated. The voltage drop of the fuse is the voltage drop across the fuse at rated current. It reflects the internal resistance of the fuse and should not be too large. If a fuse with an excessive internal resistance (voltage drop) is installed in the circuit, it will affect the system parameters of the circuit, making the circuit not working properly. The standard has not only the upper limit of its value, but also its consistency.