Selection and Differences between Quick Break Fuses and Slow Break Fuses.plastic fuse board

　　The quick break fuse tube is generally used in the circuit of resistive load, such as electric kettle, electric stove, and Space heater with electric heating wire. Because the electric heating wire is a resistive load, and the working current of resistive load is basically unchanged, the quick break (quick fuse) fuse is required. Alternatively, quick break fuses may also be used in circuits that require the protection of sensitive and valuable devices such as ICs. When the load experiences a short circuit, it is necessary to fuse it in a timely manner for protection.

　　Slow break fuses, also known as delay fuses, are mainly used for inductive or capacitive loads, such as square fuses, circular fuses, plastic encapsulated miniature fuses, which are generally very common in switching power supplies. In the switching power supply, there is a Electrolytic capacitor with a very large capacity. When the capacitor is first powered on, it is close to short circuit, and its charging current is very large. At this time, the current of the whole machine may exceed its rated working current. If a quick break fuse is used, it is likely that the fuse will be damaged due to the excessive charging current of the capacitor at the moment of power on. Be careful not to replace the fuse with a higher current at this time, It may be due to other reasons, such as circuit problems where the circuit board is broken, but the fuse is still good. The large current generated at the moment the capacitor is energized will not damage the fuse and will not affect the normal operation of the circuit. For inductive loads such as motors and compressors, the current is very high at the moment of startup. Therefore, if the working current of inductive or capacitive loads is unstable, slow breaking fuses need to be used to enhance their anti pulse ability.

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