{"product_id":"siemens-hjd63b400l-400a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens HJD63B400L - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003eSiemens HJD63B400L delivers dependable branch circuit protection for demanding electrical layouts, combining a robust 400A rating with a bolt-on design that stays secure under vibration and busy panel environments. Designed for three-phase systems, this 3-pole molded case circuit breaker provides reliable overcurrent and short-circuit protection in panelboards and loadcenters, making it a practical choice for a wide range of installations. Key features tuned for real-world use\n\u003cul\u003e \u003cli\u003eSecure bolt-on mounting for a rigid, vibration-resistant bus connection, helping maintain consistent electrical contact and reducing nuisance trips.\u003c\/li\u003e \u003cli\u003eThermal-magnetic trip unit that delivers stable, repeatable protection across varying temperatures and loads, so you’re not guessing when protection will act.\u003c\/li\u003e \u003cli\u003e3-pole configuration designed for three-phase circuits, ideal for equipment and machinery that require balanced protection across all phases.\u003c\/li\u003e \u003cli\u003e400A amperage rating and 600V maximum voltage, suitable for residential, commercial, and light industrial applications where robust feeder protection is essential.\u003c\/li\u003e \u003cli\u003eCompatibility with matching OEM loadcenters and panelboards, simplifying replacement or upgrade projects without sacrificing fit or performance.\u003c\/li\u003e\n\u003c\/ul\u003e Why this breaker matters in your electrical system\n\u003cp\u003eThe HJD63B400L isn’t just a component—it’s a protection partner for your panelboard or loadcenter. The bolt-on mounting is more than a snap-on benefit; it translates to long-term reliability in environments with vibration, temperature swings, or mechanical stress. The thermal-magnetic trip mechanism provides precise coordination with upstream devices, helping prevent cascading trips while still delivering fast response to actual faults.\u003c\/p\u003e Practical use cases you’ll appreciate\n\u003cul\u003e \u003cli\u003eInstalling or upgrading main distribution panels in commercial spaces where three-phase equipment (drives, compressors, HVAC controls) demands solid, dependable protection.\u003c\/li\u003e \u003cli\u003eFeeding large branch circuits in light industrial settings, where surge and short-circuit events must be contained quickly to protect wiring and downstream devices.\u003c\/li\u003e \u003cli\u003eReplacing aging or incompatible breakers in OEM panelboards with a compatible Siemens solution that matches performance expectations and mounting style.\u003c\/li\u003e \u003cli\u003eServicing residential projects that require robust three-phase protection for subpanels or multi-unit installations.\u003c\/li\u003e\n\u003c\/ul\u003e Technical snapshot (quick reference)\n\u003cp\u003eType: Thermal-magnetic molded case circuit breaker • Poles: 3 • Amperage: 400A • Voltage: 600V • Mounting: Bolt-on • Application: Branch circuit overcurrent and short-circuit protection\u003c\/p\u003e Who should consider the Siemens HJD63B400L\n\u003cul\u003e \u003cli\u003eElectrical contractors and integrators building or upgrading panelboards and loadcenters for three-phase systems.\u003c\/li\u003e \u003cli\u003eFacility managers in commercial settings who need reliable, low-variance protection for critical circuitry.\u003c\/li\u003e \u003cli\u003eMaintenance teams looking for a durable, OEM-compatible replacement option that aligns with Siemens panel technologies.\u003c\/li\u003e\n\u003c\/ul\u003e In short, the Siemens HJD63B400L stands out with its secure bolt-on mounting, stable thermal-magnetic protection, and seamless compatibility with Siemens OEM panels. It’s a purpose-built solution for reliable 3-phase protection at 400A and 600V, ready to safeguard your branch circuits in residential, commercial, and light industrial environments.\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349809615010,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens_breaker_and_panel_2be74254-4096-4638-bf37-1f52978b6253.png?v=1764157446","url":"https:\/\/www.ampstate.com\/products\/siemens-hjd63b400l-400a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}