{"product_id":"square-d-mjp36400yp-circuit-breaker","title":"Square D | MJP36400YP | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D MJP36400YP Circuit Breaker is a precise, field-ready protection device designed for demanding electrical installations. With a 400A rating, a 3-pole configuration, and a 600V maximum, this part provides reliable overcurrent protection and dependable performance in retrofit, maintenance, and replacement projects. When you need to match exact specifications for existing panels, the MJP36400YP ensures compatibility without guesswork.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e MJP36400YP\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Circuit Breaker (Square D)\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this model stands out\u003c\/h3\u003e\n\u003cp\u003eDesigned to align with the original equipment specifications, the MJP36400YP offers a reliable replacement path when panel labels and service manuals point to a 400A, 3-pole, 600V device. The part number itself serves as the strongest compatibility reference, reducing uncertainty during procurement and installation. This is not a generic substitute—it’s a true match for systems configured around the Square D MJP series intent and footprint.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance of existing electrical panels requiring a precise 400A, 3-pole, 600V protection device\u003c\/li\u003e \u003cli\u003eRetrofits where original specifications must be preserved to maintain panel performance and trip characteristics\u003c\/li\u003e \u003cli\u003eReplacement of a failed breaker in commercial or light-industrial distribution boards that rely on this exact configuration\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation notes\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, \u003cstrong\u003econfirm fit and ratings\u003c\/strong\u003e to ensure seamless integration. The \u003cstrong\u003epart number MJP36400YP\u003c\/strong\u003e is the best reference for compatibility with your panel. Verify that the panel’s labeling supports a 600V maximum and that the circuit breaker’s 3-pole arrangement matches your bus configuration. If you’re unsure, consult your panel documentation or a licensed electrician to avoid mismatches.\u003c\/p\u003e \u003ch3\u003ePractical tips for a smooth replacement\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eKeep the original packaging until you’re ready to install to protect the component from damage\u003c\/li\u003e \u003cli\u003eDocument the part number and installation date for future service parts planning\u003c\/li\u003e \u003cli\u003ePower down the equipment and follow proper lockout\/tagout procedures before replacing the breaker\u003c\/li\u003e \u003cli\u003eHandle the breaker with care to preserve its connectors and mounting provisions for a secure fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46426337214626,"sku":"MJP36400YP","price":2010.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-mjp36400yp-circuit-breaker-400a-3-pole-600v-685.webp?v=1789559510","url":"https:\/\/www.ampstate.com\/products\/square-d-mjp36400yp-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}