Square D MH36800 I-Line Three-Phase Circuit Breaker

Square D MH36800 I-Line molded‑case circuit breaker delivers 800 A at 600 V in a 3‑pole package, built on the MH family with I‑Line plug‑in mounting for fast, secure installation in commercial and industrial distribution panels. This thermal‑magnetic device provides long‑time and instantaneous trip functions (LI protection) to guard feeders and connected equipment, with an I‑Line style connection that integrates with Square D panelboards and distribution gear. The unit is rated for 800 A, 3 poles, and voltage up to 600 V, with an interrupting capability listed at 65 kA at 480 V, reflecting its suitability for high‑fault‑current environments common in industrial facilities. Typical applications include main circuit protection and feeder protection in I‑Line panelboards and other distribution configurations where robust, plug‑in protection is required for 3‑phase systems.