| 摘要 |
A circuit breaker which includes first arcing and permanent contacts that are mounted stationary inside an enclosure, second arcing and permanent contacts that are mounted to move inside the enclosure along a longitudinal direction and designed to co-operate with the first contacts, and a system for inserting a closure resistance, the second contacts forming a portion of equipment carrying a blast nozzle. The resistance insertion system comprises a semi-moving block which is disposed to be displaced in the longitudinal direction by the blast nozzle during a closure operation. The block carries a first switching contact designed to co-operate with a stationary second switching contact connected to the first stationary permanent contact. By displacement of the block, the first and second switching contacts are moved towards each other to short circuit the closure resistance while the first and second arcing contacts are in contact with each other and the first and second permanent contacts are separate from each other.
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