Circuit breaker

摘要

A circuit breaker comprises a container made of electrically insulating material, the container being constituted by a casing and a cover; a switching mechanism contained in the container; partition walls defining a recess in the casing, the recess being separated from an interior of the container by the partition walls; and a base made of electrically insulating material, on which an accessory which is in the form of a cassette is detachably mounted, the base being detachably mounted in the recess formed in the cover.