Schneider Electric SK5271U Transformer Disconnect

Schneider Electric's Square D SK5271U transformer disconnect is a Class 9070, Type SK device designed to isolate industrial control transformers. Rated for up to 600 VAC and listed with a NEMA Type 1 enclosure, the 9070 SK design typically uses fuse blocks (two on the primary, one on the secondary) mounted on the transformer disconnect to provide overcurrent protection. This unit is used to safely isolate a control transformer in commercial or industrial electrical panels, offering a dedicated disconnect that supports maintenance while aligning with the standard SK 9070 specifications for voltage, enclosure, and mounting.