Fuse: The Core Safety Device For Circuit Protection
May 13, 2022
Fuse: the Core Safety Device for Circuit Protection
Circuit safety usually needs to be jointly guaranteed by two types of components: control devices and protection devices, and fuses are current protection devices. In terms of subdivision, the circuit control device controls the circuit through mechanical and electronic switches, while the circuit protection device mainly refers to the ability to automatically cause the relevant part to fuse or other abnormal conditions such as overcurrent, overvoltage and overheating in the circuit. Physical changes to achieve the function of cutting off or inhibiting abnormal current or voltage, so as to achieve the purpose of protecting circuits and related equipment.
The fuse is mainly composed of melt, arc extinguishing medium, M effect point, insulating shell, contact terminal and indicator. When the circuit is in operation, the load current will flow through the fuse, and the thermal effect generated when the circuit is short-circuited or overloaded will melt or vaporize the melt in the fuse, resulting in a physical fracture, which generates an arc, and the fuse cuts off the fault by extinguishing the arc. circuit to protect the circuit.
