Siemens | JXD63S400AL | Circuit Breaker | 400A | 3-Pole | 600V

Siemens JXD63S400AL Circuit Breaker — a rugged, three-pole protection device engineered for demanding three-phase electrical systems. With a 400A rating and a 600V maximum, this breaker is built to safeguard heavy loads while integrating seamlessly into Siemens panel architectures.

Key specifications

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Part number: JXD63S400AL

Why this Siemens breaker stands out

Designed for maintenance, retrofit, and replacement scenarios where exact spec matching matters, this breaker relies on the trusted JXD63S400AL reference for effortless compatibility. The 3-pole configuration provides synchronized protection across all phases, helping prevent unbalanced loads and protecting motors, drives, and other heavy equipment in industrial settings.

Ideal use cases

• Replacing a failed 400A, 3-pole, 600V Siemens breaker in industrial panels
• Retrofits where a 3-phase, 600V feeder protection is required for large motors, pumps, or HVAC equipment
• Servicing and maintenance programs that require on-hand spare breakers with exact spec matching

How to ensure you get the right fit

Before ordering, confirm that your panel requires a 400A, 3-pole, 600V protection device and that the part number matches JXD63S400AL. The part number is the most reliable reference for compatibility, helping you minimize downtime and installation risk in critical electrical environments.

What you’ll experience with a proper install

Consistent three-phase protection with straightforward, reliable mechanical operation, enabling quick replacement during maintenance windows. Keep a spare on hand to reduce downtime and maintain steady power delivery for essential equipment.