Square D Y1B140 U 40A 277V 1 Circuit Breaker

Square D Y1B140U is a 40-amp, 277-volt single-pole circuit breaker designed to protect a single branch circuit in compatible Square D electrical panels. This Square D device is intended for 277V circuits typical in certain commercial and industrial applications and provides reliable overcurrent protection for wiring and connected loads. As a 1-pole unit from the Square D line, it integrates with standard Square D panelboard installations and uses the brand's protection mechanism to interrupt fault currents and safeguard circuits. For exact compatibility with a specific panel or enclosure, consult the panel's labeling or the manufacturer's cross-reference to ensure the Y1B140U will fit your system.