NXM400S 3P Molded Case Circuit Breaker 400A Adjustable Current Multi Rating Compact Housing

Model NXM400S/3300 Plastic Housing Circuit Breaker A compact, multirating circuit breaker designed for threepole electrical protection in industrial and commercial installations. The NXM400S family covers a range of nominal currents and is built with a plastic housing for lighter weight and easier handling. Key benefits Clear, selectable ratings for flexible compatibility: available ratings include 250A, 315A, 350A, and 400A to match a variety of load requirements. Threepole protection: 3P configuration provides coordinated protection for threephase systems and simplifies wiring for threephase motors and equipment. Spaceefficient plastic housing: reduces panel space and weight while enabling straightforward installation and replacement. Simplifies retrofits and conversions: common mounting and rating options make it suitable for upgrading distribution panels and converter inputs without major rewiring. Robust interruption capability: designed to interrupt overloads and shortcircuit faults for improved circuit reliability in demanding applications. Important attributes Model and size identification: NXM400S 3300250A and NXM400S/3300 3P400A350A315A R134a (model codes and rating options included to ensure correct selection). Function: threepole circuit breaker for overcurrent and shortcircuit interruption in threephase electrical systems. Material: durable plastic housing for reduced weight and electrical insulation. Performance: available up to 400A nominal current, suitable for distribution circuits, motor protection, and power converter inputs. Compatibility: works with standard threephase panels and equipment that accept 3P breakers in the listed current ranges. Practical use scenarios Industrial motor protection: protect threephase motors or motor starter circuits in manufacturing lines where selectable current ratings allow matching motor full load current. Compressor and refrigeration circuits: use with compressor starter panels and refrigeration systems that use R134a refrigerant, where a reliable threepole breaker is required for the compressor motor supply. Panel retrofits and converter upgrades: older breakers or fit into distribution panels when converting singlepurpose panels to feed equipment or power converters rated within the 250A to 400A range. Quick selection checklist Confirm required nominal current: choose 250A, 315A, 350A, or 400A based on load calculations. Verify threepole requirement: select the 3P version for threephase systems. Confirm panel mounting and physical space match the plastichoused breaker dimensions. Ensure coordination with upstream and downstream protection devices for proper selectivity. This description preserves the specified models, sizes, and functions to help you choose the correct NXM400S/3300 circuit breaker for your application.