IEEE C37.48.1

Abstract

This guide provides information on the application, operation, and coordination of high-voltage (&gt;1000 V) fuses and associated equipment. The information supplements that presented in IEEE Std C37.48&#8482;.¹ These guidelines apply to the following specific types of equipment, intended for use on alternating current distribution and power class systems: <br>a) Distribution and power class current-limiting type fuses. b) Distribution and power class current-limiting fuse disconnecting switches. <br>c) Items a) and b) used in fuse enclosure packages. <br>d) Fuse supports of the type intended for use with distribution and power class fuses, and fuse disconnecting switches. <br>e) Disconnecting devices created by the use of a removable switch blade in a distribution or power class fuse support. <br>f) Distribution class and power class current-limiting, and combination types of external capacitor fuses used with a capacitor unit, groups of units, or capacitor banks. <br>g) Backup current-limiting fuses ("motor-starter fuses") used in conjunction with high-voltage Class E2 motor starters (see ANSI/UL 347 [B1]²). <br><strong>Purpose</strong> <br>The purpose of this guide is to expand on aspects of the general fuse application guide, IEEE Std C37.48, in areas associated with the application and coordination of high-voltage (&gt;1000 V) current-limiting fuses. This guide is more "tutorial" in nature than IEEE Std C37.48, and includes descriptions as to how different types of fuses work. It was developed to create a better understanding of how most fuse types operate, but with an emphasis on current-limiting fuses after the category "full-range" was added to the existing categories of "backup" and "general-purpose" current-limiting fuses. <br>¹ Information on references can be found in Clause 2. <br>² The numbers in brackets correspond to those of the bibliography in Annex B.