Schneider Electric FA36040 ILine Circuit Breaker

Schneider Electric's Square D FA36040 is a three-pole, 40-amp molded‑case circuit breaker built on the FA frame for I‑Line panel systems, rated for service up to 600 VAC. It provides thermal‑magnetic protection for three‑phase circuits with a fixed, non‑interchangeable trip unit, and uses a line‑side I‑Line connection with load‑side lugs that accommodate 14–1/0 AWG aluminum or copper conductors. With an interrupting rating of 25 kA at 240 VAC, 18 kA at 480 VAC, and 14 kA at 600 VAC, the FA36040 is designed for reliable short‑circuit protection in commercial and light industrial distributions. The device is typically used in Square D I‑Line panelboards and switchboards, offering plug‑in mounting and a compact, rugged molded‑case construction that supports continuous operation at up to 80% of its listed rating. This makes it suitable for protecting feeders and branch circuits in electrical distribution systems where three‑phase protection and quick isolation are required. Designed for standard 600 V three‑phase installations, it accepts 14–1/0 AWG aluminum or copper conductors on the load side, with a line‑side I‑Line connection for plug‑in mounting in compatible panelboards. The FA36040's robust construction and fixed thermal‑magnetic trip provide dependable protection for feeders and branch circuits across commercial and light industrial applications.