| 摘要 |
A high tension circuit breaker having a dielectric gas under pressure, the circuit breaker being of the type including at least one interrupting chamber comprising an insulating shell filled with the gas and containing a fixed assembly including a fixed main contact and a fixed arcing contact, a moving assembly including a moving main contact and a moving arcing contact, a blast cylinder opening out into a blast nozzle, and a pair of secondary contacts, the circuit breaker being characterized in that the blast cylinder is delimited by a first cylinder (5) constituting the moving arcing contact, a second cylinder (7) constituting the main moving contact, and a semi-moving first piston (14) carrying one of the secondary contacts, with the other secondary contact (31) being carried by a fixed tube (15) which, together with the first piston, an insulating tubular extension (5B) of the first cylinder (5), and a second piston fixed to the cylinder (5) and sliding along the fixed tube, delimits a second closed volume (35).
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