US PATENT SUBCLASS 337 / 158
.~.~ Current limiting devices (e.g., high voltage fuses)

Current as of: June, 1999
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337 /   HD   ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES

14  DF  ELECTROTHERMALLY ACTUATED SWITCHES {9}
142  DF  .~ Fusible element actuated {15}
158.~.~ Current limiting devices (e.g., high voltage fuses) {1}
159  DF  .~.~.~> Comprising significant fuse link or element structure or arrangement {2}

DEFINITION

Classification: 337/158

(under subclass 142) Subject matter including a fusible device with the ability to limit a short circuit current to an initial peak magnitude well below the peak magnitude of the current which the protected circuit would be capable of developing under like conditions if a link of negligible resistance and sufficient capacity to survive at least a half cycle of current without melting, were employed in the place of the current limiting fuse device used. The instantaneous value of the current causing the fuse to blow is usually determined by a physical resistor of the desired characteristic or by the use of a particular filler material.

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Devices,

103+, for safety devices utilizing thermal (e.g., fuses) means with granular means for the cooling of vapors resulting from the arc of rupture.