Compressed-air breaker

A compressed-gas circuit breaker, comprising:

• (a) movable and stationary contact members movable relative to each other along an axis and each member movable relative to each other along an axis and each member having at least an arcing contact,
• (b) a pressure space formed in said movable contact member for storing compressed quenching gas during an opening procedure of the breaker, said pressure space having a volume independent of the travel of said contact members,
• (c) an insulating nozzle, arranged coaxially to said contact members and fixed on said movable contact member, wherein said nozzle includes an orifice which, during closing of the breaker, passes by the arcing contact of said stationary contact member and, during opening of the breaker, connects said pressure space to an exhaust space,
• (d) a sliding contact, displaceable in an axial direction, for guiding said arcing contact of said stationary contact member,
• (e) a compression spring acting on said arcing contact of said stationary contact member,
• (f) a blocking mechanism arranged downstream from said orifice of said insulating nozzle, including said arcing contact of said stationary contact member and a latch rotatably mounted in said insulating nozzle such that one end of the latch is movable through said nozzle orifice into said exhaust space, and
• (g) a latching part arranged on said arcing contact of said stationary contact member for interacting with said latch,
• (h) wherein said arcing contact of said stationary contact member penetrates said movable contact member in a closed position of the breaker and charges said compression spring at the beginning of the opening procedure, and,
• (i) wherein said charged compression spring, after release of said latching part, moves said arcing contact of said stationary contact member oppositely to said movable contact member.