Single-Ended and Double-Ended Unit Substations — Close-Coupled MV to LV

Used and surplus close-coupled unit substation for sale — primary MV switch, step-down transformer, and secondary LV switchgear in one line-up, the single-source MV-to-utilization block for datacenter and industrial power.

Used and surplus close-coupled unit substations available for sale through Pantheon. A unit substation close-couples a primary medium-voltage section, a step-down transformer, and a secondary low-voltage switchgear or switchboard section into one factory-coordinated line-up, delivering medium-voltage service to utilization voltage in a compact footprint. A single-ended line-up carries one primary, one transformer, and one secondary bus; a double-ended line-up puts two of each on a main-tie-main bus, so either transformer can carry the whole load when a source is lost. Common at datacenter, hospital, and industrial sites, it is built to IEEE C57.12 / C37.20 with air-insulated construction and coordinated protection. OEM lead times for the transformer and switchgear inside a unit substation currently run two to four years; in-stock and surplus assemblies compress that schedule from years to weeks. Exact rating, hours, and configuration confirmed at quote.