Fusible element for electric fuses based on a M-effect

Details Fusible element for electric fuses based on a M-effect Fusible element for electric fuses based on a M-effect

1979-05-31

1980-10-07

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337296, 337295, H01H 8512

Patent

active

042271681

ABSTRACT:
A fusible element for electric fuses based on M-effect, i.e. the severing of a high fusing point base metal by a low fusing point overlay metal by a process of metal interdiffusion. The M-effect, or Metcalf effect, as widely used in electric fuses, has a main limitation consisting in requiring too long periods of time for severing the base metal. The problem of severing the base metal by the overlay metal in shorter times is solved, according to this invention, by arranging the overlay metal on the front side and on the rear side of the base metal, in spaced relation to a point of reduced cross-section of the base metal.
While the invention is applicable to all M-effect fuses, it is of particular importance in regard to Standard for Class L fuses of the Underwriters Laboratories Inc. which have fusible elements that are of copper, as distinguished from Class L fuses having fusible elements of silver, or Class L fuses having fusible elements in part of copper, and in part of silver.

REFERENCES:
patent: 2988620 (1961-06-01), Kozacka
patent: 3116389 (1963-12-01), Withers
patent: 3123693 (1964-03-01), Kozacka
patent: 3523265 (1970-08-01), Feenan et al.
patent: 4118684 (1978-10-01), Mollenhoff
patent: 4146863 (1979-03-01), Mollenhoff

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