Schneider Electric A1B340 Molded Case Circuit Breaker

Schneider Electric's Square D A1B340 Molded Case Circuit Breaker is a three-pole molded case circuit breaker (MCCB) rated for 40 amps at 240 volts, built to interrupt current and protect electrical distribution panels from overloads and short circuits. Designed for three‑phase applications, the A1B340 protects feeders and branch circuits in commercial and light industrial environments where reliable, up-to-code overcurrent protection at 240 V is essential. As part of the Square D family under Schneider Electric, the A1B340 aligns with widely used MCCB configurations and is compatible with standard panel enclosures that support 3‑pole, 40 A, 240 V protection devices. This model is a straightforward choice for replacing aging MCCBs or integrating into new builds where a 40 A, 240 V, three‑pole breaker is required. Because of its 240 V rating and 40 A current, it supports standard three‑phase protection schemes common in modern facilities.