| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit breaker in which arc resistance is improved by reducing wear of a grid of a deion type arc extinguishing chamber due to arc. SOLUTION: An arc extinguishing chamber 10 of deion grid type is installed at a current cut-off part of a circuit breaker, and the arc extinguishing chamber 10 includes a grid which is arranged along the opening movement route of a movable contactor 3 and has a V-shape cut-out groove 12a formed in the center of the plate surface. A wedge-shape central partition wall 14 made of a polymer material of insulating object is provided at the rear side on the grid plate surface on the extension line of the V-shape cut-out groove 12a as a wind direction guiding member to divert the arc extinguishing gas flow to right and left by dividing like the arrow heads P1, P2. COPYRIGHT: (C)2008,JPO&INPIT
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