Dead-end Spools used for a disconnecting switch

[Trade Journal]

Publication: Electrical World

New York, NY, United States
vol. 53, no. 6, p. 360-361, col. 2, 1

Weatherproof Fuse and Disconnecting Switch.

The accompanying illustration shows a high-tension weatherproof fuse and disconnecting switch, consisting of a fuse chamber, arc chute, fuse holder and disconnecting switch, all the elements being self-contained and so designed as to be directly mounted on an ordinary cross-arm without alignment. The disconnecting switch is mounted on a heavy porcelain insulator and the other elements are contained in a heavy, specially designed, petticoated weatherproof porcelain chamber attached to a galvanized-iron support adapted for mounting on standard cross-arms.


Weatherproof Fuse and Disconnecting Switch.


The fuse holder proper is provided with an insulating handle in the end of which is located a pin which engages a bayonet lock in the fuse holder, in turn provided with a secondary locking device which, after the fuse holder is forced into the fixed contacts, holds the fuse in position. The handle is then removed, leaving the fuse in series with the line and preventing unauthorized persons from tampering with it.

The fuse is of the expulsion type, being so designed that its lowest melting point is within a metallic expulsion chamber which receives the shock and at the same time collects the gas, the explosive action of which expels the heated gases through properly located port holes.

By the use of the disconnecting switch a lineman can safely replace a blown fuse, although the disconnecting switch is not intended for opening a circuit under load.

It is said that a long series of tests on a transmission system were made before the final design was adopted, and that while the present limitations are 13,200 volts at 15 amp, experiments under way indicate that the limits can be carried considerably higher.

The above fuse is being placed on the market by the Central Electric Company, Chicago, Ill.


Keywords:Dead-end Spool
Researcher notes: 
Supplemental information: 
Researcher:Elton Gish
Date completed:January 29, 2011 by: Elton Gish;