Siemens JXD63B400H - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens JXD63B400H is a 400 A, 600 V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built to stand up to demanding electrical environments, it delivers reliable protection where it’s needed most—in both new installations and service upgrades.

Why this breaker stands out

• Secure bolt-on mounting creates a rigid, vibration-resistant bus connection that stays tight through thermal cycling and panel activity, helping maintain consistent electrical performance over time.
• Thermal-magnetic trip unit provides fast magnetic response to short circuits with thermal protection for overloads, delivering stable, repeatable protection curves across a wide range of loads.
• 3-pole design well suited for 3-phase panelboards and multi‑wire circuits common in commercial and light-industrial settings.
• 400 A, 600 V rating supports high-current feeders and heavy-duty branch circuits in demanding environments.
• OEM-compatible designed to integrate smoothly with matching Siemens panelboards and loadcenters for reliable performance and straightforward replacement or retrofits.
• Versatile application ideal for residential, commercial, and light-industrial installations where robust protection and service continuity are critical.

Practical use cases to consider

• In a large residential service upgrade, use as a main feeder or a major branch-circuit protector to safely manage high-current loads such as electric heating or large HVAC equipment.
• In a commercial panelboard, deploy as a main disconnect or critical feeder for motors, pumps, and compressor systems that require dependable short-circuit protection.
• During panel retrofit projects, replace aging or failing breakers with this 3-pole 400 A unit to restore reliable protection and improve mechanical stability in vibration-prone environments.

Product highlights at a glance

• 400 A
• voltage rating: 600 V
• poles: 3
• mounting style: Bolt-on
• type: Thermal-magnetic molded case circuit breaker
• application: Branch circuit overcurrent and short-circuit protection

With the Siemens JXD63B400H, you’re selecting a robust, purpose-built solution designed to deliver dependable protection, straightforward installation, and long-term reliability in panelboards and loadcenters. It’s the practical choice for electricians and facilities professionals who demand precise protection without compromise.