Schneider Electric Square D A1B120AK Circuit Breaker

Schneider Electric's Square D A1B120AK is a 1-pole, 20-amp molded-case circuit breaker (MCCB) designed to provide overcurrent protection for 120-volt circuits within Square D distribution panels and other compatible enclosures that accept A1B-series devices. The A1B120AK variant uses bolt-on mounting and a thermal-magnetic trip mechanism that combines overload protection with fast-acting short-circuit interruption, helping isolate faults while minimizing nuisance trips in normal operation. With an interrupting rating of 10 kA at 120 VAC, this unit meets common protection requirements for branch circuits in light-commercial wiring, and it supports long-time and instantaneous trip functions depending on operating conditions. As part of the older A1B series, the A1B120AK is described in some catalog references as obsolete, although it continues to be stocked by certain distributors for retrofit work and to support legacy installations. Model designation A1B120AK identifies this precise variant within Square D's A1B family, ensuring compatibility when an exact 1P, 20A, 120V A1B120AK unit is required.