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This paper presents a comparative evaluation of isolated dc-dc converter topologies used in Solid State Transformers (SST) meant for low/medium voltage standalone applications. The SST architecture is constructed with Power Factor Corrected - Continuous Conduction Mode (PFC-CCM) ac-dc converter for front end rectification and a single phase bridge inverter for the final inversion process. The performance of the SST is evaluated with five market-ready isolated dc-dc converter topologies, push-pull, full-bridge, half-bridge, LLC half- bridge and LLC with synchronous rectification. The evaluation is based on the overall system efficiency, part count, system losses, voltage regulation capability, product lifetime and mean time between failures (MTBF). PowerEsim, a result-oriented computer aided design tool with a huge databank of real-time circuits and components available in the market is used for performance assessment of the aforementioned topologies.