{"product_id":"siemens-hjm3m400-400a-3p-600v-circuit-breaker","title":"Siemens HJM3M400 400A 3P 600V Circuit Breaker, Bolt-On | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens \u003cstrong\u003eHJM3M400\u003c\/strong\u003e — a robust 400 A, 3-pole, 600 V bolt-on circuit breaker designed to shield panelboards, load centers, and electrical distribution systems from overloads. Built for everyday electrical work, it’s an ideal choice for replacement projects and stocking spares to keep your bill of materials (BOM) in line with the original part number.\u003c\/p\u003e \u003cp\u003eWhy the HJM3M400 stands out in practical installations:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBolt-On mounting\u003c\/strong\u003e provides a secure, fast-to-install solution that stays put in busy electrical environments.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e400 A capacity\u003c\/strong\u003e with a 3-pole configuration delivers reliable three-phase protection for demanding commercial or industrial circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e600 V rating\u003c\/strong\u003e supports a wide range of distribution setups, making it suitable for many standard electrical distributions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOriginal-part alignment\u003c\/strong\u003e helps you maintain BOM integrity during repairs or upgrades, reducing confusion and rework.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReplacement-ready\u003c\/strong\u003e design means fewer compatibility concerns when restoring systems to spec after outages or maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal applications and use cases\u003c\/h3\u003e\n\u003cp\u003eUse the HJM3M400 in panelboards and load centers where three-phase protection is required, such as commercial electrical rooms, industrial distribution panels, and service equipment with a need for dependable, field-replaceable protection devices. It’s especially advantageous when you’re:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003ePerforming a targeted replacement to restore original protection levels without altering the BOM.\u003c\/li\u003e \u003cli\u003eStocking spares for quick, on-site swaps to minimize downtime.\u003c\/li\u003e \u003cli\u003eMaintaining alignment with the original Siemens part number during system upgrades or reconfigurations.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eSpecifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e HJM3M400\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Circuit Breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage rating:\u003c\/strong\u003e 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eNeed help confirming fit?\u003c\/h3\u003e\n\u003cp\u003eChoosing the right part can feel routine until compatibility matters. If you’re unsure whether the HJM3M400 matches your panelboard, load center, or distribution setup, AmpState is ready to assist. \u003cstrong\u003eMessage us\u003c\/strong\u003e to verify compatibility and ensure a seamless replacement that preserves system safety and performance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46413709410466,"sku":"HJM3M400","price":29741.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_513d6710-3734-4b27-839d-f68e6f4b470a.png?v=1765492974","url":"https:\/\/www.ampstate.com\/products\/siemens-hjm3m400-400a-3p-600v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}