Schneider Electric A203B121 Molded Case Circuit Breaker

The Schneider Electric A203B121 Molded Case Circuit Breaker is a Telemecanique three‑pole MCCB designed for industrial power distribution and motor branch circuit protection. It provides overload and short‑circuit protection for electrical equipment and feeders in manufacturing facilities, motor control centers, control panels, and power distribution boards. This panel‑mount device uses a thermal‑magnetic trip unit for reliable interrupting action and is intended for use within industrial power distribution and motor control systems, conforming to IEC 60947-2 (series dependent). Common applications include protecting motors, feeders, and power distribution circuits in environments such as manufacturing plants, conveyor systems, HVAC equipment, pumping stations, and process automation panels. Common replacements include Schneider Electric NSX100F Molded Case Circuit Breaker, Siemens 3VM1010-4ED32-0AA0 Molded Case Circuit Breaker, and Eaton NZM1-100 Molded Case Circuit Breaker.