Importance

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Abstract

A gas-blast circuit-breaker includes a jacket filled with a dielectric gas. A mobile arc contact cooperates with a fixed arc contact within the jacket. The mobile arc contact is part of a mobile contact assembly which is displaceable axially in the jacket between a closed position and an open position. The mobile contact assembly includes a first tube carrying the mobile arc contact and a second tube, which is coaxial with the first tube, carrying a mobile permanent contact with a gas blast nozzle coupled thereto. A ring joins the first tube and the second tube to define a gas-blast chamber and a compression chamber on opposite sides of the ring. The compression chamber communicates with the gas-blast chamber. An annular piston having an annular recess closes the compression chamber. A compression spring influences the annular piston against a fixed front stop. A floating ring is moveably mounted on the first tube between a front abutment position in which the floating ring abuts a fixed washer and a rear abutment position in which the floating ring abuts a rear retaining member, the floating ring being housed in the annular recess when the annular piston abuts the fixed front stop. The floating ring has an orifice which is blocked by the fixed washer when the floating ring is in the front abutment position.

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First Claim