Chemically activated switch

Electricity: circuit makers and breakers – Liquid contact – Time delay

Patent

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Details

200150G, 337401, H01H 3368

Patent

active

042244919

ABSTRACT:
A switch is provided for use in controlling currents associated with power line faults. The switch includes a housing with a pair of relatively movable electrodes opened and closed by means of chemical propellants. In the preferred form, one electrode comprises a movable contact slidably disposed in a support cylinder within the housing and the other electrode is fixed. The sliding contact is movable into a closed position in which the electrodes are in mutual contact. A first chemical propellant charge disposed in the support cylinder drives the contact into the closed position. A chamber for holding dielectric fluid is disposed in the housing and extends through an opening in the fixed electrode. A second propellant charge is located behind a piston in the chamber. When in the closed position, the contact blocks and closes the opening in the electrode, thus closing the chamber. Upon detonation of the second propellant charge, the piston is driven against the fluid in the tube, driving the contact into the open position.

REFERENCES:
patent: 2931874 (1960-04-01), Leaman
patent: 3264438 (1966-08-01), Gay
patent: 3548848 (1970-12-01), Stichling
patent: 3909676 (1975-09-01), McConnell
Fuji Publication EEC65, "Fuji Indoor Use Fuse", Fuji Electric Co., Ltd.

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