Siemens HJXD63S400 A - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens HJXD63S400A is a rugged 400 A, 600 V, 3-pole bolt-on molded case circuit breaker designed to protect your electrical distribution system. Built for dependable branch circuit overcurrent and short-circuit protection, it’s a smart, reliable choice for panelboards and load centers that demand strong, consistent performance.

• Secure bolt-on mounting delivers a rigid, vibration‑resistant bus connection, reducing the risk of loose contacts in demanding environments and ensuring long-term reliability.
• Thermal‑magnetic trip unit provides stable, repeatable protection for both overloads and short circuits, adapting to varying load conditions to minimize nuisance tripping without compromising safety.
• OEM‑grade compatibility designed to drop into matching Siemens OEM load centers and panelboards, enabling straightforward retrofits and factory‑fit installations without adapters.
• Versatile residential, commercial, and light industrial use—perfect for protecting large feeders and critical branch circuits in a wide range of electrical environments.

The HJXD63S400A is purpose-built to safeguard your electrical system where reliability matters most. With a 400 A rating and 600 V maximum, this three-pole breaker is ideal for incoming service sections, distribution panels, and subpanels that power heavy appliances, motors, or multiple circuits. Its bolt-on design is particularly advantageous in cabinets where vibration or movement is a factor, helping to maintain solid electrical contact over time.

Key specifications at a glance

• Amperage rating: 400 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Who should consider this breaker? Any professional upgrading or installing Siemens‑compatible panelboards in homes, small to mid‑size commercial facilities, or light industrial environments will appreciate the combination of strong current handling, stable protection behavior, and straightforward integration offered by the HJXD63S400A. It’s a practical choice when you need durable protection that performs consistently under real-world conditions, minimizes downtime, and aligns with Siemens’ OEM equipment for a cohesive electrical system.