{"product_id":"square-d-lll36400u31x-400a-3-pole-circuit-breaker","title":"Square D LLL36400U31X - 400 A, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D LLL36400U31X, a robust 400 A, 3-Pole molded case circuit breaker designed to safeguard panelboards and loadcenters with precision. Trusted by professionals and available through AmpState, this unit delivers dependable branch circuit overcurrent and short-circuit protection for demanding electrical systems.\u003c\/p\u003e \u003cp\u003eEngineered for real-world reliability, this breaker combines a compact molded-case design with a thermal-magnetic trip mechanism. The result is stable, repeatable protection that responds appropriately to overloads while delivering rapid magnetic trips for high-current faults—minimizing downtime and protecting wires, devices, and panels.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSpace-efficient design:\u003c\/strong\u003e Compact form factors maximize usable panel space, helping you fit more protection where it matters.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic protection:\u003c\/strong\u003e Thermal protection handles gradual overloads with predictable timing, while magnetic protection instantly trips on severe faults.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole configuration:\u003c\/strong\u003e Ideal for three-phase systems common in commercial and light industrial applications, enabling coordinated protection for multi-wire feeders.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e400 A rating:\u003c\/strong\u003e Supports high-current feeders and main circuits within compatible panelboards, delivering robust protection without compromising performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility:\u003c\/strong\u003e Designed to pair with matching Square D OEM loadcenters and panelboards for seamless installation and reliable operation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application:\u003c\/strong\u003e Suitable for residential, commercial, and light industrial environments where dependable branch circuit protection is essential.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications\u003c\/h3\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 LLL36400U31X\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal-magnetic molded case circuit breaker\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\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhether you're upgrading an existing panel, designing a new electrical distribution system, or replacing a failed breaker, the Square D LLL36400U31X delivers dependable protection with OEM compatibility and smart space utilization. Invest in a proven protection solution—trust Square D, trusted by electricians and supported by AmpState.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355327680674,"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_a747df9b-4182-4a71-ad93-15988a6a9f22.png?v=1764691374","url":"https:\/\/www.ampstate.com\/products\/square-d-lll36400u31x-400a-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}