Current limiting device

Details Current limiting device Current limiting device

1975-07-08

1976-10-19

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Expansible or vaporizable fluid-actuated

337122, 337159, H01H 8700

Patent

active

039873889

ABSTRACT:
A current limiting device includes a duct containing a current-limiting material therein which serves to interconnect two spaced terminals but which is evaporable when subjected to an over-current flowing through the material between the terminals. The wall forming this duct includes a region made from a highly-temperature-resistant material which has a relatively small cross-section that connects with another region of the duct having a larger cross-section, and the wall part forming the region of smaller cross-section is surrounded by a resistor member connected electrically in parallel with the current-limiting material disposed therein and which has a resistance value such that the current-limiting material is relieved of current following onset of an over-current condition.

REFERENCES:
patent: 3599137 (1971-08-01), Ito
patent: 3611041 (1971-10-01), Itoh
patent: 3886511 (1975-05-01), Miyamoto et al.

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