Schneider Electric A1B320 Molded Case Circuit Breaker

Schneider Electric’s Square D A1B320 molded‑case circuit breaker is a 3‑pole, 20‑amp device rated for 240 V, designed for bolt‑on mounting in compatible Square D panels. It uses a thermal‑magnetic trip mechanism with long‑time and instantaneous trip functions and has a 10 kA interrupting rating at 240 VAC. The A1B320 is part of the A1B series of molded‑case breakers used in 3‑phase distribution, commonly protecting feeders and branch circuits in commercial and light industrial panels. As an older, now‑obsolete model, new units are rarely available; refurbished or reconditioned A1B320 breakers may be found from some suppliers.