Schneider Electric’s Square D A1B120 is a 1-pole, 20-amp molded-case circuit breaker from the A1B series. It provides overcurrent protection for a single branch circuit when installed in compatible Square D panels, with a 120 VAC rating and a 10 kA projection at 120 V, and it is listed for DC operation up to 48 VDC. The A1B120 designation identifies this specific 20 A, 1‑pole unit, making it suitable for straightforward replacement or integration within appropriate Square D/MCCB footprints in industrial and commercial electrical systems.
