Circuit breaker

摘要

A circuit breaker (1) includes a housing (3); separable contacts (59) mounted in the housing (3); and an operating mechanism (22) for opening and closing the separable contacts (59). An overcurrent assembly (53) is responsive to selected conditions of current flowing through the separable contacts (59) and actuates the operating mechanism (22) to trip open the separable contacts (59). A bonnet (171) forms a U-shape which surrounds the separable contacts (59) and which cools and splits an arc when the operating mechanism (22) trips open the separable contacts (59). A first bonnet piece (173) forms a first leg (177) of the bonnet (171), and a second bonnet piece (175) forms a second leg (179) and a base (181) of the bonnet (171).