Electric fuse capable of interrupting small currents

Details Electric fuse capable of interrupting small currents Electric fuse capable of interrupting small currents

1977-03-23

1978-07-04

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337293, H01H 8504

Patent

active

040991563

ABSTRACT:
In fuses exceeding a certain voltage rating it is necessary to establish series multibreaks to interrupt small overload currents. An initial break is formed in the helically wound fusible elements near the center thereof where the temperature is highest. If the arc voltage along this initial break does not exceed the circuit voltage, even after a number of cycles of arcing, secondary or tertiary breaks must be formed in series to the initial break. This is achieved according to the present invention by providing one or more quarter-turns of reduced pitch where the spacing between contiguous groups of windings is reduced and a low temporary current flashover is allowed to occur which results in the formation of secondary and tertiary breaks.

REFERENCES:
patent: 3569889 (1971-03-01), Amagasaki et al.
patent: 3747041 (1973-07-01), Cameron
patent: 3801945 (1974-04-01), Howard

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