Schneider Electric 9999SB9U UL Listed Circuit Breaker

Schneider Electric’s Square D 9999SB9U UL Listed circuit breaker is a 30-amp, 600-volt protective device intended to interrupt overcurrent on a dedicated branch circuit within electrical distribution systems for commercial and industrial environments. The model number 9999SB9U uniquely identifies this unit in the Square D family, and the UL listing confirms it is approved for use in panels and enclosures that specify Square D breakers as acceptable replacements or classified equivalents. Rated at 30 A with a maximum operating voltage of 600 V, it defines the electrical limits of the protected circuit, making it suitable for feeders and branch circuits where higher-voltage distribution is common. For proper installation, always verify panel compatibility on the device nameplate and panel labeling, and consult Schneider Electric’s official datasheet or distributor documentation to confirm mounting, terminal configuration, and exact mechanical dimensions before purchase.