Square D HDA36040 Three Phase Circuit Breaker

The Square D PowerPact HDA36040 is a 3-pole, 40 A molded‑case circuit breaker designed for I‑Line panelboard installations, offering thermal‑magnetic protection for three‑phase circuits up to 600 VAC (600 VAC / 500 VDC) and an interrupting rating of 14 kA at 600 VAC. It features line‑side I‑Line mounting with ABC phase connections and load‑side lugs for 14–3/0 AWG aluminum or copper conductors, within the PowerPact H family designed for reliable use in MCCs and distribution panels. This plug‑in, non‑interchangeable‑trip device is UL listed and rated for 80% continuous operation, making it a compact, robust choice for industrial protection where space is at a premium. Ideal for motor control centers, distribution panels, and other industrial applications needing compact, reliable protection for three‑phase loads.