Patent ID: 6483064
Filing Date: 2002-11-19
Classification: H01H

Abstract:
An insulating blast nozzle for a circuit breaker, the circuit breaker having a first arcing contact and a second arcing contact that separate from each other when the circuit breaker is opened subsequent to prior separation of permanent contacts, said insulating blast nozzle being secured to one of the permanent contacts and being horn-shaped, having a throat and defining a volume of revolution having an upstream portion and a downstream portion joined by the throat, in which an inside volume is cylindrical and closed by the second arcing contact when the circuit breaker is closed, the wall of the nozzle in the upstream portion of said volume of revolution surrounding said first arcing contact, the downstream portion of said volume of revolution comprising a first conical portion comprising a first flare angle, wherein said first conical portion is followed by a second conical portion comprising a second flare angle, wherein said second flare angle is larger than said first flare angle.