What is the difference between AC cylindrical fuse and DC cylindrical fuse?

In daily life, our fuses can be divided into DC cylindrical fuse and AC cylindrical fuse. What is the difference between these two? Let's take a look.

First of all, DC is low voltage and low current, low voltage and high current, etc., while AC is high voltage and low current, high voltage and high current, etc. The two fuses can be distinguished according to the form of protection.

1. There are differences in current characteristics

The current of AC cylindrical fuse changes periodically in direction, and the arc is easy to extinguish naturally when there is a zero point. The direction of DC cylindrical fuse is relatively stable, without zero point, the arc is more difficult to extinguish, and a stronger arc extinguishing ability is required.

2. Different types of design

AC cylindrical fuse mainly relies on current zero point arc extinguishing, and the requirements for arc extinguishing materials are relatively low, and there are no special requirements. However, DC cylindrical fuses require special arc extinguishing materials such as high-density quartz. AC cylindrical fuses are usually designed based on AC effective values, while for DC we need to consider the stable current of DC and the difficulty of segmentation.

3. Key differences

The AC cylindrical fuse uses an AC fuse. The arc is easy to extinguish when the current passes through the zero point. We can design the fuse more compactly. The arc of DC is more persistent and requires more stringent arc extinguishing measures. The voltage of AC is more demanding. Under the same voltage, the actual voltage of the DC fuse is higher than that of the AC fuse.

The design of the DC cylindrical fuse is more complicated and the cost is relatively high. We cannot use AC cylindrical fuses to replace them at will when using them.

When using them, we must strictly select fuses according to the type of circuit.