20120175348 | Single-Pole Breaking Unit Comprising a Rotary Contact Bridge, Switchgear Device Comprising Such a Unit and Circuit Breaker Comprising Such a Device - A breaking unit comprising a contact bridge, at least one stationary contact operating in conjunction with said contact bridge and a rotary bar having a transverse hole accommodating said bridge which is salient on each side of the bar, said bar being fitted between two side panels of the breaking unit. Said contact bridge comprises two sealing flanges respectively placed between the radial surfaces of the rotary bar and the side panels. At least one arc extinguishing chamber opens onto an opening volume of the contact bridge. The rotary bar comprises at least one channel connected to the transverse accommodating hole. | 07-12-2012 |