Siemens JXD63L400L - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Siemens JXD63L400L is a 400A, 600V, 3-pole molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Its compact molded-case design makes the most of available panel space, while its thermal-magnetic trip unit delivers stable, repeatable protection when you need it most. Built to integrate seamlessly with matching Siemens OEM loadcenters, the JXD63L400L keeps electrical characteristics aligned for reliable performance in real-world installations—whether in homes, offices, or light industrial settings.

Key Features

• Compact molded-case design minimizes footprint, freeing up space inside panelboards and loadcenters.
• Thermal-magnetic trip unit provides both overload protection (thermal) and instantaneous short-circuit interruption (magnetic) for predictable, fast fault clearance.
• 3-pole configuration ideal for 3-phase systems common in commercial and light industrial applications.
• 400A amperage rating suitable for main or feeder protection, helping to shield circuits from damaging faults.
• 600V voltage rating compatible with typical industrial distribution networks.
• OEM compatibility designed to pair with matching Siemens loadcenters and panelboards for consistent fit and performance.
• Versatile applications appropriate for residential, commercial, and light industrial environments requiring reliable circuit protection.

Why this matters

Choosing the JXD63L400L means you’re selecting a protection device that mirrors the electrical characteristics of your Siemens panel ecosystem. The thermal-magnetic trip ensures reliable response to overloads while instantly interrupting severe faults, reducing the risk of damage to wiring, components, and connected equipment. The 3-pole design supports balanced 3-phase systems, keeping voltage, current, and protection curves consistent across your panelboard. With a space-efficient footprint and OEM-grade compatibility, installation is straightforward, with fewer compatibility concerns or rework during panel upgrades.

Compatibility & Applications

This breaker is engineered to be used with Siemens panelboards and loadcenters that require a 3-pole, 400A molded-case solution. Its design and trip characteristics align with Siemens’ protection philosophy, making it a dependable choice for projects that demand cohesive electrical performance across components. Ideal in scenarios such as:

• Upgrading or replacing aging breakers in residential or commercial Siemens panels
• Feeding heavy-load circuits in light commercial spaces and small industrial setups
• Providing robust, branch-circuit protection in new or retrofit panel installations

Technical Specifications

• Manufacturer: Siemens
• Part Number: JXD63L400L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Installation & Maintenance Tips

For best results, install the JXD63L400L in accordance with local electrical codes and Siemens installation instructions. Verify panel compatibility (bus type and mounting) and ensure the panelboard is rated for 600V and 400A protection. Regularly inspect connections and keep the area around the breaker clear for heat dissipation. When selecting components, opt for the corresponding Siemens OEM panelboards or loadcenters to preserve coordinated protection characteristics and ease future servicing.