| 摘要 |
A portable breakload tool which permits opening of electric devices under load so that the opening is made without apparent external arc. The tool includes an arch quenching chamber in which two fixed contacts and a rotatable contact are positioned. The movable contact is operated externally to cut current between the contacts. The electric arc is confined within the chamber and is quenched by the sulfur hexafluoride gas which fills the chamber.
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