Square D A1L320U three-pole molded-case circuit breaker (MCCB) from Square D/Schneider Electric, rated 20 A at 240 V AC and configured for three‑phase service. Identified by the A1L320U designation, this 3P MCCB belongs to the A1L family and provides fixed overcurrent protection for circuits in industrial electrical installations where 240 V three‑phase power is used.
