{"product_id":"square-d-mh36400-400a-3-pole-plug-in-circuit-breaker","title":"Square D MH36400 - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D MH36400—a rugged 400 A, 3-pole plug-in molded case circuit breaker designed to protect your electrical distribution with precision. Built for dependable branch circuit overcurrent and short-circuit protection, this unit fits seamlessly into panelboards and load centers, keeping critical circuits safeguarded in demanding environments.\u003c\/p\u003e \u003ch2\u003eKey benefits that matter in real-world setups\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e for quick installation and streamlined replacements, minimizing downtime during upgrades or service calls.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by responding appropriately to overloads and sudden short circuits, even as ambient conditions change.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole configuration\u003c\/strong\u003e suited for 3-phase systems, enabling coordinated protection for motors, feeders, and commercial-scale circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e guarantees reliable fit and performance with matching Square D load centers and panelboards, preserving listings and ensuring proper bus compatibility.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-capacity protection\u003c\/strong\u003e—400 A rating makes it ideal for main disconnects or feeder protection in residential, commercial, and light industrial applications.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhat problems does it solve?\u003c\/h2\u003e\n\u003cp\u003eWhen overcurrent or a short circuit arises, the MH36400 steps in to interrupt power quickly and safely, reducing the risk of overheating, equipment damage, and downtime. Its plug-in format simplifies field service, while the thermal-magnetic mechanism provides predictable tripping behavior across a range of fault conditions. For facilities that rely on reliable power distribution, this breaker offers a durable, maintenance-friendly solution that’s designed to integrate with existing Square D panel ecosystems.\u003c\/p\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eMain disconnects or feeder protection in commercial panelboards and load centers\u003c\/li\u003e \u003cli\u003eThree-phase motor circuits and heavily loaded distribution feeds\u003c\/li\u003e \u003cli\u003eResidential or light industrial subpanels requiring robust 400 A protection\u003c\/li\u003e \u003cli\u003eSituations demanding quick field replacement without rewiring, thanks to the plug-in design\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical specifications at a glance\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Square D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e MH36400\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal-magnetic molded case circuit breaker (MCCB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage Rating:\u003c\/strong\u003e 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Plug-in\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e Residential, commercial, and light industrial environments\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eChoose the Square D MH36400 when you need a dependable, high-capacity, plug-in MCCB that integrates smoothly with Square D panelboards and load centers. Its fast installation, predictable thermal-magnetic protection, and robust 3-pole design make it a practical, long-term solution for demanding electrical systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355345997986,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/schnieder_and_square_d_breaker_and_panel_776b65fd-a4b1-4821-857e-2ba02ff02433.png?v=1764691434","url":"https:\/\/www.ampstate.com\/products\/square-d-mh36400-400a-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}