Compressed gas HV power switching device

摘要

The invention concerns a compressed-gas circuit breaker with two coaxially disposed contacts (1, 2) at least one of which can be driven to move in the longitudinal direction, the two contacts delimiting in the break state a switch path (3). The circuit breaker also has a nozzle (4), made of insulating material, which is connected to the driven contact (2) and which surrounds at least part of the switch path (3). The invention calls for a high-strength plastic tube (9) lying coaxially against the outside of the insulating nozzle (4) in order to prevent said nozzle (4) from expanding radially as a result of an increase in quencher-gas pressure.