Siemens | HJXD63B300L | Circuit Breaker | 300A | 3-Pole

Meet the Siemens HJXD63B300L, a dedicated 300A, 3-Pole circuit breaker engineered for robust protection in three-phase electrical systems. This unit is purpose-built for maintenance, retrofit, and replacement scenarios where exact specifications matter, delivering reliable interruption to protect wiring, devices, and personnel in demanding environments.

Key specifications at a glance

• Amperage: 300 A
• Poles: 3-Pole
• Part number: HJXD63B300L

Note: Confirm fit and ratings before ordering. The part number is the best reference for compatibility.

Why this Siemens circuit breaker stands out

• Designed for three-phase protection, ensuring reliable clearance and isolation in multi-wire systems common in industrial and commercial facilities.
• Aligned with Siemens engineering standards, offering predictable performance when used in compatible panels and distribution boards.
• Ideal for upgrades and replacements where maintaining exact specifications is critical to system safety and compliance.

Ideal use cases and who benefits

• Maintenance teams performing panel upkeep and component swaps in 3-phase electrical networks.
• Retrofit projects where older equipment needs to be upgraded to specify 300A, 3-Pole protection.
• Replacement of worn or damaged breakers in panels that accept the HJXD63B300L form factor and ratings.

Practical guidance for installation and compatibility

Before you order, verify that your equipment accepts a 300A, 3-Pole Siemens device with the HJXD63B300L reference. Use the part number as the definitive compatibility check to ensure correct mounting, bus connections, and protective characteristics. If you’re upgrading or replacing, pair this breaker with matching Siemens components designed for the same panel family to maintain consistent protection performance and electrical safety standards.

Practical tips for best results

• Keep a spare HJXD63B300L on hand for planned maintenance to minimize downtime.
• Label the replacement process clearly in your panel documentation, citing the exact part number for future reference.
• Consult an licensed electrician to confirm panel compatibility and to perform the installation in accordance with local codes and standards.