Magnetic arc extinguished fusible elements

Details Magnetic arc extinguished fusible elements Magnetic arc extinguished fusible elements

1982-12-13

1985-02-05

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337161, 337295, H01H 8504

Patent

active

044980680

ABSTRACT:
An electrical fuse wherein one or more portions of the fuse element are provided with two adjacent parallel weak spots separated by dielectric material or air gap, and arranged such that the direction of current flow in one of the adjacent weak spots is opposite that in the other adjacent weak spot, such that a magnetic field is generated which produces a separating force between the two weak spots. Arcs formed during the fusing of the weak spots are forced apart by the generated magnetic field thus increasing the arcs path lengths which increases arc voltage thereby forcing arc current to zero.

REFERENCES:
patent: 1227752 (1917-05-01), Cole
patent: 1604477 (1926-10-01), Ogle
patent: 2720567 (1955-10-01), Detch
patent: 3479630 (1969-11-01), Kozacka

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