Variable impedance current limiting device

Details Variable impedance current limiting device Variable impedance current limiting device

1981-11-13

1984-01-31

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Expansible or vaporizable fluid-actuated

337121, 337321, H01H 8700

Patent

active

044292953

ABSTRACT:
A current limiting device including a housing in which a chamber is formed. A pair of spaced electrical terminals are located at opposite ends of the housing to be disposed in communication with the chamber. An electrically conductive fusible metal is disposed in the chamber to provide an electrically conductive path between the terminals. An insulating member is disposed in the chamber between opposite ends of the housing to define a flow passageway between the electrical terminals. The flow passageway may include a constricted portion that has a cross-sectional area and a length that is substantially less than the rest of the flow passageway defined by the insulating member such that with the occurrence of a fault current, vaporization of the fusible metal initially occurs in the constricted portion of the flow passageway. Expansion means are also provided for buffering the pressure rise in the chamber when the fusible metal is vaporized.

REFERENCES:
patent: 3644860 (1972-02-01), Yamagata et al.
patent: 3699489 (1972-10-01), Imajyo
patent: 3806855 (1974-04-01), Hurtle
patent: 3886511 (1975-05-01), Miyamoto et al.
patent: 3902150 (1975-08-01), Wada et al.

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