Square D Y1B120 Circuit Breaker

Square D Y1B120 is a 1‑pole molded‑case circuit breaker rated 20 A at 277 VAC, belonging to Square D’s Type Y1B family. It uses bolt‑on mounting and a thermal‑magnetic trip mechanism to provide reliable overcurrent protection for a 277 VAC circuit, with an interrupting capacity of 10 kA at 277 VAC. This single‑pole device is designed for use in enclosures that accept Y1B breakers in commercial electrical installations, protecting feeders or branch circuits against overloads and short circuits in 277 VAC distributions. Manufactured by Square D (Schneider Electric), the Y1B120 combines a rugged molded‑case construction with straightforward installation for compatibility in appropriate panels and switchgear.