| 摘要 |
<p>An electrical switching apparatus (2) includes two arc runners (4,6), two contacts (8,10) in electrical communication with the respective runners, a movable contact (12) having two portions (14,16) respectively cooperating with the contacts to provide closed and open contact positions, and two arc chambers (18,20) each including two ends (22;30,24;32), a longitudinal axis (26;34) therebetween, and arc plates (28;36) between the ends. A magnet assembly (40) cooperates with the arc chambers (18,20) to establish a generally unidirectional magnetic field (42) normal to the axes, normal to a first direction (44) of a first arc (46) between one contact (8) and the first portion (14) as it moves away from the closed toward the open contact position, and normal to an opposite second direction (48) of a second arc (50) between the other contact (10) and the second portion (16) as it moves away from the closed toward the open contact position. The magnetic field causes one arc to enter one arc chamber depending upon current flow direction between the contacts.</p> |
