Appendix A:Proper Fuse Size for a Varistor-Based Surge Suppressor

摘要

It is easy to specify an oversized fuse for a varistor-based surge suppression system.This happens when the value of current extracted from a varistor surge rating curve is too large.The result is a fuse that doesn't adequately protect from and explosion when the varistor becomes saturated.Too small a fuse will blow prematurely and too large a fuse won't protect properly,so it is essential to conduct tests to find the right size.This paper shows how curves are used to obtain a starting point for experimentally determining the proper size of the fuse.