Siemens JXD63B400 - 400 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens JXD63B400 raises the bar for reliable, high-current protection in electrical panels. This 400 A, 600 V, 3-pole bolt-on molded case circuit breaker is built to safeguard branch circuits and prevent costly downtime in panelboards and load centers. With a rugged bolt-on mounting and a precise thermal-magnetic trip unit, it delivers consistent protection even in environments subject to vibration and electrical noise.

Key features that differentiate this breaker

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays put even in demanding installations.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining thermal overload sensing with magnetic short-circuit interruption.
• OEM-ready compatibility designed to fit Siemens OEM panelboards and loadcenters for reliable alignment and trip coordination.
• High-current capability 400 A at 600 V, ideal for main feeders and heavy-load branches in commercial and light industrial settings.
• Versatile application suitable for residential, commercial, and light industrial applications that demand robust branch-circuit protection.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: JXD63B400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical applications and use cases

• Main feeders in commercial panelboards where a high-current, reliable main protection is required.
• Distribution panels in light industrial facilities that need dependable 3-pole protection for three-phase circuits.
• Retrofits or replacements in Siemens-compatible panelboards where bolt-on breakers are specified.
• Situations demanding a vibration-resistant connection in environments with motor loads or equipment that generate periodic shock.

Why choose the JXD63B400 for your panel

Choosing this Siemens breaker means investing in a unit designed to maintain consistent protection performance under real-world conditions. The combination of bolt-on mounting, a thermal-magnetic trip, and OEM compatibility translates to fewer field adjustments, clearer trip curves, and smoother integration with your existing Siemens panel infrastructure. It’s a purpose-built solution for spaces where reliability and alignment with factory specifications matter most.

Technical reliability, precise protection, and seamless panel compatibility come together in the Siemens JXD63B400. Part Number JXD63B400. If your project calls for a 3-pole, 400 A, 600 V bolt-on molded case circuit breaker designed for sturdy panel connections and consistent trip behavior, this unit is engineered to meet those needs you can count on day after day.