Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Patent
1978-04-10
1980-05-20
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
337159, H01H 8510
Patent
active
042041848
ABSTRACT:
A fuse-element for electric fuses is shaped as a metal strip with one or more zones of diminished cross-section.
The temperature rise conditions of the fuse-element and of its zones of diminished cross-section can be established and evaluated in combination and--based on these data--a fuse-element can be designed the temperature distribution characteristics of which include different local peak values and the spots where such peak values develop can be set in a manner that the whole fuse-element consists of two parts as far as the temperature distribution is concerned, i.e. a first part where this distribution is in accordance with a steady state distribution (the highest current value still failing to cause any melting), and a second part where the temperature rise distribution determines the character of the melting process, this being the so-called transient distribution characteristic. Such a design facilitates an essentially more exact setting of the rated currents and the desired melting time/current characteristics.
The solution of this task, according to the invention, consists in that at least one of the zones of diminished cross-section, extending longitudinally along a part of the metal strip at which the operating temperature reaches relatively small values, is of a smaller cross-section than the remaining zones and exceeds the latter ones in length. The smallest cross-section is preferably arranged as a marginal zone, i.e. the zone is disposed next to one end of the fuse-element.
REFERENCES:
patent: 3116390 (1963-12-01), Goody et al.
patent: 4101860 (1978-07-01), Fister
Csizy Tibor
Karpat Arpad
Melis Janos
Szemerey Zoltan
Broome Harold
Marmorek Ernest F.
Villamos Berendezes es Keszuvek Muvek
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