Schneider Electric LH36400 I-Line Circuit Breaker

Schneider Electric's Square D LH36400 is a 400 A, three‑pole molded‑case circuit breaker designed for I‑Line distribution panels. Rated for 600 V AC and with a 25 kA interrupting capacity at that voltage, it provides reliable protection for three‑phase feeders and branch circuits in commercial and light industrial installations. The LH36400 uses an I‑Line mounting style for plug‑in installation into compatible Square D I‑Line panels, enabling quick swaps and straightforward field servicing. This thermal‑magnetic (magneto‑thermal) breaker combines long‑time and instantaneous trip functions to guard circuits against overloads and short circuits across the ABC phases, helping maintain system uptime in demanding environments. As part of the LH family, it pairs with other Square D I‑Line devices to deliver consistent protection, interchangeability, and panel‑level protection in motor control centers, switchgear, and panel boards that require robust three‑phase protection up to 600 VAC and 400 A.