Information on the application, operation and maintenance of high-voltage fuses (above 1000 V and through 169 W), distribution enclosed single-pole air switches, fuse disconnecting switches, and accessories for use on ac distribution systems is provided. These include enclosed, open, and open-link types of distribution cutouts and fuses; distribution current-limiting fuses; distribution enclosed single-pole air switches; power fuses, including current-limiting types; outdoor and indoor fuse disconnecting switches; fuse supports, mountings, and links, all of the type used exclusively with the above; and removable switch blades for certain products among the above

Document is a guide to the application, operation and Maintenance of all types of High-Voltage fuses and associated equipment covered by the C37.4X series of standards. The project will revise approximately 20% of the document, while retaining the original document scope. [Original Scope - Revise/update scope, make improvements, and expand application to cover other devices (specifically full-range fuses, capacitor fuses, expulsion fuses in enclosures).]

The standard provides use guidance on fuses and associated equipment. The proposed revision is to clarify and expand certain areas. Some of these were identified by comments to the vote on the last revision of the standard, while others have been identified by user feedback since that date.