Must Have Square D Q221150AC – 150A 2 Pole Molded Case Circuit Breaker

Built for robust commercial and industrial power distribution, this 150-amp thermal-magnetic breaker ensures dependable overcurrent protection. The unit fastens securely into Square D I-Line panelboards, specifically utilizing an A-C phase connection to help balance panel loads. Rated for 10kA fault current, it features the signature Visi-Trip flag for rapid fault identification and serves as a predecessor to the modern PowerPact QBA221502 series.