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What is the importance of a vacuum circuit breaker panel?

It is similar to other CBs. Its just that it is more compact, is less prone to failure unless the vacuum bottle gets punctured or something. Unlike other CBs where the moving and fixed contacts opearte in SF6, its moving and fixed contacts are sealed in a vacuum bottle which can operate even when SF6 gas pressure is low (LBS IS ALWAYS IN SF6 BUT CB CAN BE IN SF6 OR VACUUM) and can be replaced easily after its useful life.