Time delay dual element fuse with greater blowing time accuracy

Details Time delay dual element fuse with greater blowing time accuracy Time delay dual element fuse with greater blowing time accuracy

1980-10-21

1982-03-23

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337163, H01H 7120, H01H 8504

Patent

active

043215742

ABSTRACT:
A dual element, time delay fuse with greater blowing time accuracy and improved operating characteristics wherein any bridging of the circuit opening air gaps by molten alloy is effectively precluded during operation of the fuse, especially operation initiated by small protracted overloads. This is accomplished with a fuse element assembly comprising a series connection of a short circuit member, a central absorber member and a heater element member, the central absorber member held to the short circuit member and heater element member by masses of fusing alloy on each of its ends, which masses of fusing alloy are prevented from combining in fabrication and circuit opening operation by flow restricting apertures located near each end of the absorber member.

REFERENCES:
patent: 2400491 (1946-05-01), Duerkob
patent: 2493434 (1950-01-01), Yonkers
patent: 2827532 (1958-03-01), Kozacka
patent: 2832868 (1958-04-01), Kozacka
patent: 2866040 (1958-12-01), Skeats
patent: 2988620 (1961-06-01), Kozacka
patent: 3144534 (1964-08-01), Baumbach
patent: 3261952 (1966-07-01), Kozacka
patent: 3735312 (1973-05-01), Nagel

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