Patent ID: 7482901
Filing Date: 2009-01-27
Classification: H01H

Abstract:
1. A circuit breaker comprising: a make-and-break mechanism part that includes an operating handle, and is disposed between frame plates opposite to each other; a base having a cross bar that turns in cooperation with said make-and-break mechanism part, a moving contact that cooperates with said cross bar, a fixed contact that repeats the contact and separation from said moving contact, a breaking portion including an arc-extinguishing device functioning to extinguish arc generated between said moving contact and said fixed contact, and an over-current trip device; a middle base in which a partition wall serving to separate said breaking portion from said make-and-break mechanism part, and said breaking portion from said over-current trip device, is provided; and in which said make-and-break mechanism part is contained; and a cover with which said base, middle base and each of parts contained in said base and middle base are covered; wherein said frame plates of said make-and-break mechanism part are secured to said base when said middle base is provided in said circuit breaker and are secured to said base through spacers when said middle base is removed from said circuit breaker.