Square D FA34100 3-Phase I-Line Circuit Breaker

Square D FA34100 is a 100 A, three‑pole I‑Line molded‑case circuit breaker from the FA series, rated for 480 VAC operation with a 250 VDC rating. It uses a thermal‑magnetic trip mechanism and is designed for plug‑in mounting in I‑Line panels with ABC phase connections. The FA34100 delivers an 18 kA interrupting rating at 480 VAC (25 kA at 240 VAC), making it well suited to protect feeders and motor circuits in 3‑phase 480 V systems. With its 100 A capacity and I‑Line style, it serves as a reliable main feeder or branch‑circuit protection device in industrial distributions and manufacturing environments where compact, compatible protection is required in Square D enclosures. Typical applications include protection for 480 VAC motors, feeders, and large electrical loads in factories, processing facilities, and HVAC installations that rely on three‑phase power.