Fuse

Details Fuse Fuse

1991-05-06

1992-08-18

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

29623, H01H 8504

Patent

active

051402955

ABSTRACT:
An elongated substrate made of an electric insulating material carries an elongated conductive track made of aluminium which has a constriction in its centre part in order to increase the heating of the said centre part with a view to reducing as much as possible the volume of material to melt. The ends of the track each comprise an annular part which partially covers a nickel or aluminium pad. The connection and cooling of the ends is carried out by connection brackets. This fuse is calculated in such a way that for a rated current IN, a maximum temperature variation .DELTA.T and a length of the electric conductor designated 2b, thermal equilibrium is obtained when the relationship between the cross section S of the said conductor and that S' of the base material corresponds approximately to:

REFERENCES:
patent: 4272753 (1981-06-01), Nicolay
patent: 4749980 (1988-06-01), Morrill, Jr. et al.
patent: 4873506 (1989-10-01), Gurevich
patent: 5027101 (1991-06-01), Morrill, Jr.
IEEE Proceedings, vol. 132, Pt 1, No. 3, Jun. 1985--Temperature Measurements of Thin Films on Substrates by D. deCogan et al--pp. 143-146.
Microelectronics Centre, School of Electronic Engineering South Australian Institute of Technology, "High Speed Thick Film Fuses" by A. J. Marriage and B. NcIntosh--pp. 15-17.

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