PV System 27/38 delivers advanced vacuum circuit breaker technology and uncompromising attention to every detail ‚¬â€œ top to bottom, inside and out. You receive superior performance and functional simplicity.The metal-clad compartment construction protects via grounded compartments, conductor insulation and live part shielding. When breakers are moved to the test position, grounded aluminum shutters automatically cover both line and load stabs. Each circuit breaker cell features closed-door racking, closed door mechanical trip and lockout features.