Certified Square D Y1B120 – 20A 1 Pole Molded Case Circuit Breaker

Built for commercial 277VAC lighting distribution, this single-pole 20A breaker delivers dependable thermal-magnetic overcurrent protection. It is engineered to support 277V applications in industrial facilities. Designed as a bolt-on unit, it mounts into obsolete Square D NY1B panelboards, providing a seamless fit for older infrastructure. The breaker utilizes standard load side lugs for secure wire terminations. Carrying an SWD rating, it is approved for switching fluorescent lighting loads.