Siemens | HJXD63M400 | Circuit Breaker | 400A | 3-Pole | 600V | Bolt-On

Introducing the Siemens HJXD63M400 circuit breaker — a purpose-built solution for heavy-duty electrical systems requiring dependable protection. With a 400A rating across three poles and a 600V maximum, this bolt-on breaker is designed for maintenance, retrofit, and replacement scenarios where exact specifications matter. Built to integrate seamlessly into compatible Siemens panel architectures, it ensures consistent, reliable shutdown during overcurrent events while keeping installation robust and straightforward.

Key specifications at a glance

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Mounting: Bolt-On
• Part Number: HJXD63M400

What makes this breaker stand out

The HJXD63M400 is purpose-built for three-phase circuits common in industrial and larger commercial installations. Its bolt-on design provides a secure, vibration-resistant connection ideal for equipment with frequent starts, high motor loads, or panels that require a solid mechanical mounting. By delivering precise overcurrent protection at 400A, it helps safeguard conductors, equipment, and personnel while allowing you to maintain alignment with existing panel specifications.

Ideal use cases

• Maintenance and retrofits where existing equipment matches the HJXD63M400 specifications
• Replacement of failed circuit breakers in 3-pole, 600V systems
• Upgrading or expanding service in industrial panels that require a 400A, 3-pole, bolt-on solution

Installation and compatibility considerations

Before ordering, confirm fit and ratings to ensure compatibility with your panel. The part number HJXD63M400 serves as the best reference for matching existing configurations, bus connections, and mounting footprints. This breaker is intended for bolt-on installations where a solid mechanical connection and precise trip performance are essential.

Why choose Siemens for this application

Siemens is known for engineering accountability and long-term reliability in electrical protection. The HJXD63M400 aligns with that commitment, delivering consistent performance across demanding environments while supporting streamlined maintenance and servicing workflows. If your project requires exact Siemens specs for a 400A, 3-pole, 600V bolt-on circuit breaker, this model is a clear fit.