Specifications for high voltage (above 1000 volts) Class A and Class B expulsion and current-limiting fuses. This includes: a) Expulsion type Class A [distribution class] fuses, fuse cutouts, fuse disconnecting switches, their associated fuse links or refill units, disconnecting cutouts, and accessories for these devices with rated voltages from 1 through 38 kV. b) Expulsion type Class B [power class] fuses, fuse disconnecting switches, their associated fuse links or refill units, disconnecting cutouts, and accessories for these devices with rated voltages from 1 through 170 kV. c) Class A and Class B current-limiting fuses and accessories for these devices ...

This standard establishes specifications for high-voltage (above 1000 V) fuses and accessories for use on ac electrical distribution systems. Devices with rated maximum voltages to 170 kV are covered. The devices to which this standard applies are as follows: a) Expulsion fuses (including fuse cutouts) b) Current-limiting fuses c) Items a) and b) used in fuse enclosure packages d) Fuse supports of the type intended for use with fuses and fuse disconnecting switches e) Disconnecting devices (fuse disconnecting switches, disconnecting switches, and disconnecting cutouts) created by the use of a removable fuse unit or switch blade in a fuse support f) Expulsion...

Standard specifications for the devices covered by this document are necessary to assure consistent development and application of these devices by manufacturers and users of these devices.