company news about Difference between DC fuse and AC fuse

        When selecting DC fuses, the electrical specifications and structural dimensions of AC fuses cannot be simply copied, because there are many different technical specifications and design concepts between the two, which are related to the comprehensive consideration of whether the fault current can be safely and reliably disconnected and no accidents can occur.

1. The breaking arc of DC fuse is much more difficult than that of open section AC fuse

        Since DC current has no current zero crossing point, when breaking the fault current, it can only rely on the arc to extinguish itself quickly under the effect of forced cooling of quartz sand filler. The design and welding method of the melt sheet, the purity and particle size ratio of quartz sand, the melting point, curing mode and other factors all determine the effectiveness and role of DC arc forced extinction.

2. Under the same rated voltage, the tube body of DC fuse is generally longer than that of AC fuse

        Under the same rated voltage, the arc energy generated by DC arc is more than twice that of AC arc. In order to ensure that each arc can be limited to a controllable distance and extinguished rapidly at the same time, there will be no huge energy collection caused by the direct series connection of each arc, which will lead to a fuse explosion accident that lasts for a long time. The tube body of DC fuse is generally longer than that of AC fuse, Otherwise, the size difference that cannot be seen in normal use will have serious consequences when the fault current occurs.

3. When AC fuse is used in DC circuit, it should be used for reducing voltage

        Because some manufacturers do not have self-contained DC fuse products, it is feasible from a practical point of view to replace them with AC  fuses. However, for the safety reasons mentioned above, when AC fuses are used in DC circuits, they should be used with reduced voltage. This is a safety criterion recognized by the international electric industry.