Time delay fuse

Details Time delay fuse Time delay fuse

1984-06-22

1985-08-06

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337163, 337293, H01H 7120

Patent

active

045338957

ABSTRACT:
A slow-blow electrical fuse structure features one or more conducting fuse links for high-current blow-out protection and located in individual chambers filled with arc-quenching filler and in thermal contact with a spring-loaded piston-and-guide structure soldered into an extended position and similarly soldered to one of the fuse links by an extension leading through a chamber-separating insulating partition washer. At overload the heat from the fuse links melts the aforementioned soldered junctions, causing the spring to collapse the piston over the guide, simultaneously withdrawing it from the chamber, thereby breaking the circuit. A similar chamber-defining washer is captively affixed to the opposite end of the piston-and-guide assembly affixed to the optional second fuse link, both partition-forming washers being rotatingly captively secured to the ends of the piston-and-guide assembly by specially configured apertures therein. A modified version of these support washers allows the use of multiple fuse assemblies.

REFERENCES:
patent: 2577531 (1951-12-01), Laing
patent: 2657294 (1953-10-01), Laing
patent: 2688677 (1954-09-01), Laing
patent: 2787684 (1957-04-01), Laing
patent: 3253103 (1966-05-01), Fister
patent: 3854111 (1974-12-01), Urani
patent: 4184137 (1980-01-01), Gaia et al.

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