Square D 9528 UB01 84346 Universal Base Plate

Square D 9528 UB01 84346 Universal Base Plate (UB01) is a mounting base plate in the Square D 9998 series that lets you retrofit a Square D Type S NEMA motor starter in panels designed for competitive NEMA starters. Specifically configured for NEMA sizes 00, 0, and 1, the UB01 base plate provides a universal mounting footprint into which a Type S starter can be mounted, replacing the need to swap enclosures. The universal base plate is intended for use with Type S starters and is described as compatible with competitive starters, enabling a common mounting plane and alignment in existing installations. In practice, technicians use this base plate to upgrade control panels where a non-S starter is currently installed, allowing the Type S starter to be mounted on the base plate with minimal panel modification and without changing surrounding hardware. This part is commonly referenced as UB01 within the 9998 family and is sold to support retrofits across size 00 through 1 configurations, streamlining upgrades and standardizing components in motor control panels.