wherein the break is in air at atmospheric pressure

Introduced: September 1968

Last revised: January 2006

Full Title

High-tension or heavy-current switches with arc-extinguishing or arc-preventing means > Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid > wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor > wherein the break is in air at atmospheric pressure

Classification Context

Section:: ELECTRICITY
Class:: ELECTRIC ELEMENTS
Subclass:: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES