SST · Solid-State Transformer
Solid-state transformer/power-electronics conversion from medium voltage toward a rack DC bus. About 98% is a 400 kW prototype result; about 99% is a target, not a general shipping-product efficiency. Compare efficiencies only at the same topology, load point, voltage and measurement boundary.
Power-electronics conversion integrating transformer isolation and voltage conversion; compare efficiency only for a named topology, rating, load point, voltage range, and measurement boundary.
Also written as: Solid-State Transformer
Current numbers
NEC 2029 (partial, forecast); UL certification pathway openNEC 2029 expected to add partial 800 VDC provisions (SemiAnalysis); UL opened an MV SST certification program in September 2026
≥98%OCP SST Specification Rev 0.3.0 requirement: power-train efficiency at 50–100% load
~87% SST/800 VDC (SemiAnalysis model) vs ~82% AC (guide's four-stage example)Illustrative utility-to-VRM efficiency cases: SemiAnalysis May 2026 SST/800 VDC model versus the guide's four-stage AC example