company news about Distinguishing and selecting the rated current and voltage of fuses

        When selecting a fuse, how do you choose the rated current and voltage of the fuse?
        Regarding the rated current and voltage of a fuse, the rated current refers to the nominal operating current of the fuse. Code: In usually refers to the maximum current that a circuit can operate. To correctly select the rated current value of a fuse, the following considerations must be taken into account: the rated current of the fuse=the circuit operating current/standard reduction rate, for example: the circuit operating current: Ir=1.5A, the rated current of the fuse should be: In=Ir/Of=1.5/0.75=2A, where Of is the reduction rate for UL rated fuses. Therefore, you should choose a 2A fuse. For IEC standard fuses, there is no reduction rate requirement, and we can consider the working current to be the rated current, i.e. Ir=In; If a specific current rating is not universal, the nearest higher value should be selected, and the current value that you want the fuse to blow should not be taken as the rated current value.

        Rated voltage: The nominal working voltage of a fuse, code: Un, which is usually the maximum voltage that the fuse can withstand after being disconnected. Due to the voltage drop problem considered when a fuse is energized, the voltage it is subjected to at both ends is significantly less than its rated voltage, so the rated voltage is essentially irrelevant. When selecting the rated voltage of a fuse correctly, it should be noted that the rated voltage should be equal to or greater than the circuit voltage. For example, a 250V fuse can be used in 125V circuits, and for low-voltage electronic applications, an AC rated fuse can be used in DC circuits. The main consideration regarding the rated voltage of a fuse is whether the fuse has the ability to break the maximum current given when the circuit voltage does not exceed the rated voltage of the fuse.