Square D FH36040BU Three Phase Circuit Breaker

The Square D FH36040BU is a 40-amp, three-pole molded‑case circuit breaker designed for 600 V three‑phase systems, featuring I‑Line plug‑in mounting for fast, secure installation in Square D panels. Line-side I‑Line connections, ABC phase arrangement, and load-side lug terminals rated for 14–1/0 AWG aluminum or copper conductors are paired with a thermal‑magnetic trip for reliable overcurrent protection and an 80% continuous-load rating. Interrupting capabilities vary by voltage, rated at 65 kA at 240 VAC, 25 kA at 480 VAC, and 18 kA at 600 VAC, making it suitable for protecting feeders and motor circuits in commercial and industrial applications.