US PATENT SUBCLASS 218 / 118
.~ Vacuum

Current as of: June, 1999
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218 /   HD   HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES

1  DF  ARC PREVENTING OR EXTINGUISHING DEVICES {14}
118.~ Vacuum {5}
119  DF  .~.~> Polyphase {1}
121  DF  .~.~> Single-pole {3}
139  DF  .~.~> Housing structure
140  DF  .~.~> Operating mechanism structure or arrangement
141  DF  .~.~> With magnetic coil {1}

DEFINITION

Classification: 218/118

Vacuum:

(under subclass 1) Subject matter wherein the contacts are enclosed in an evacuated housing.

(1) Note. The housing may be referred to as a tube or bulb.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10, for auxiliary shunt circuit interrupter.

42, for magnetic blowout circuit interrupter.