The TWB2006DR is An outdoor 200 Amp main breaker load center with a built-in 60A manual transfer switch. The TTV features 4 full-sized circuit breaker spaces, 200A lugs for feeding through to a main panel and is approved for use the following branch circuit breakers: Siemens Type QP, QT, QPH, HQP, QE, QEH; Square D Series HOM to 100A maximum; Murray MP; C-H/Westinghouse Series BD, BR, BQ, GFC,