Why Do High Voltage Capacitors Use Drop-out Fuses?

Why do high-voltage capacitors use cover drop out fuse?
There are two main reasons for use:

1. The capacity of a single drop fuse capacitor is below 200KVAR, and there is no internal fuse inside, so an external fuse (drop fuse cutout) is required;

2. Some users consider maintenance convenience and add drop out expulsion fuse to the outside of any capacitor (with or without internal fuse). If the capacitor is overcurrent or faulty, the external drop out fuse 22kv fuse can be seen as an intuitive indication.