Square D HGA36040 U Molded Case Circuit Breaker

The Square D HGA36040-U is a three‑pole PowerPact H‑Frame molded‑case circuit breaker rated for 40 amperes and designed for industrial power distribution, with a nominal 600 V AC maximum (and 500 V DC) rating. It provides thermal‑magnetic protection and carries an interrupting capacity of 18 kA at 600 V, 35 kA at 480 V, and 65 kA at 240 V, making it suitable for protecting feeders and motors in demanding environments. This 3P device uses line‑side I‑Line connections and load‑side lugs, with phase connections ABC, and accepts aluminum or copper conductors ranging from 14 AWG to 3/0 AWG for both line and load terminations. The HGA36040‑U variant is part of Square D’s PowerPact H family, engineered for compact, reliable arc‑fault and short‑circuit protection in panelboards, switchboards, and distribution assemblies. Its thermal‑magnetic trip mechanism provides fast overload protection while enabling coordinated protection schemes within multi‑breaker assemblies. Typical applications include commercial and light industrial distribution panels, motor control centers, and other 3‑phase circuits where a 40 A rating and high short‑circuit withstand are required. This model’s combination of 40 A current rating, 600 V maximum, and high interrupting capacity helps ensure selective tripping and protection for feeders and downstream equipment in systems that operate at or below 600 VAC. The HGA36040‑U is designed for environments where robust overcurrent protection is essential, and it aligns with Square D’s PowerPact line for consistent interchangeability within compatible assemblies.