From withdrawable to fixed circuit breaker switchgear in ANSI medium voltage applications

This paper contrasts the features of medium voltage fixed circuit breaker switchgear (FCBS) and existing withdrawable circuit breaker switgear (WCBS) designs. Modern FCBS design elements that are discussed include an internal disconnect for isolation and grounding of circuits and interlocked operation among disconnect, breaker, and grounding switch for improved safety.

Furthermore, features such as lower maintenance, smaller footprint, and reduced life cycle costs that result from its simpler design will be explored. By comparing the traditional ANSI WCBS technology to that of the FCBS, this paper will demonstrate that the fixed design, which has gained widespread acceptance in global markets outside the United States, is a viable alternative to the withdrawable designs.