{"product_id":"siemens-hhjxd63b300l-300a-600v-3-pole-bolt-on-circuit-breaker","title":"Siemens HHJXD63B300L - 300 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003eSiemens HHJXD63B300L is a 3-pole bolt-on molded case circuit breaker engineered for dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. With a 300 A rating and a 600 V capacity, this unit is built to handle demanding three-phase applications while delivering reliable protection where it matters most. - Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays solid under equipment start-ups and in environments with periodic movement.\n- Thermal-magnetic trip unit provides stable, repeatable protection performance, delivering fast response to overloads and short circuits across a range of operating conditions.\n- Compatible with matching OEM load centers and panelboards, enabling straightforward replacement, upgrades, and system compatibility without custom adapters.\n- 3-pole design supports three-phase distribution, making it ideal for commercial and light industrial electrical systems that drive motors, processing equipment, and multi‑circuit feeders.\n- Suitable for residential, commercial, and light industrial applications, giving you a single solution that adapts to different project needs—from retrofit panels to new installations. Technical highlights:\n- Manufacturer: Siemens\n- Part Number: HHJXD63B300L\n- Type: Thermal-magnetic molded case circuit breaker\n- Amperage Rating: 300 A\n- Voltage Rating: 600 V\n- Number of Poles: 3\n- Mounting Style: Bolt-on\n- Application: Branch circuit overcurrent and short-circuit protection Use cases and practical scenarios:\n- In a commercial panelboard, this 3-pole breaker can protect three-phase feeders feeding HVAC units, pumps, and lighting systems while enabling quick, selective tripping to minimize downtime.\n- In a light industrial electrical room, it serves as a robust main or feeder protection for circuits powering motors and control gear, with the bolt-on mount offering a secure bus connection in vibration-prone environments.\n- As an OEM-compatible replacement in Siemens or matched-panel systems, it simplifies upgrades and maintenance without changing the enclosure or wiring harness. Why this matters:\n- The combination of bolt-on rigidity and a thermal-magnetic trip mechanism means you get a durable connection and predictable tripping behavior, reducing nuisance trips and enhancing system reliability.\n- The 600 V rating provides headroom for most commercial and light industrial distribution schemes, while the 300 A capacity supports substantial load currents without compromising protection. Tips for installation and best practices:\n- Verify mounting hardware and torque requirements per your panelboard specifications to ensure the bolt-on connection remains tight and vibration-resistant.\n- Confirm compatibility with your OEM load center or panelboard before replacing an existing unit to maintain electrical fit and coordination.\n- Label circuits clearly and inspect the trip unit response periodically to ensure protection remains aligned with load profiles and ambient conditions. Siemens HHJXD63B300L delivers a concrete, purpose-built solution for robust three-phase protection in modern panelboards and load centers, combining secure mounting, reliable protection, and seamless compatibility in a single package.\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349809451170,"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_37c91e41-8918-4f70-a26b-cd0fca507151.png?v=1764157438","url":"https:\/\/www.ampstate.com\/products\/siemens-hhjxd63b300l-300a-600v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}