Patent ID: 8063335

Claim:
A gas exhaust arrangement for a circuit breaker, comprising: a generally cylindrical shaped casing closed by a bottom at one end and with openings to allow gas to escape; a stationary duct arranged in the casing to delimit a central passage inside the duct; and an annular passage surrounding the central passage, the annular passage located between the duct and the casing, four apertures being provided in the duct exclusively proximal to the bottom to form a permanent communication between the central passage inside the duct and the annular passage, wherein the casing includes two diametrically opposite openings located in a horizontal plane and wherein a cross section of the permanent communication is greater than a cross section of the central passage, wherein a cross section of the annular passage is greater than cross section of the apertures and wherein the two openings formed in the casing are spaced by a distance from a bottom of the annular passage, and wherein the annular passage is split into two parts by two pairs of radial partitions so that a part of the annular passage communicates directly with the two openings, the gas escaping directly, and another part of the passage is isolated from the two opening, to force the gas to travel as far as the bottom of the annular passage before escaping through the two openings.