Siemens HLXD63B450 - 450 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens HLXD63B450 is a 450 A, 600 V, 3‑pole bolt‑on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short‑circuit protection in panelboards and loadcenters. Built for demanding environments, its bolt‑on mounting creates a rigid, vibration‑resistant connection to the bus, helping maintain consistent protection even in equipment with heavy mechanical vibration.

The thermal‑magnetic trip unit combines thermal (overload) and magnetic (short‑circuit) protections for stable, repeatable performance across varying loads and temperatures. That means fewer nuisance trips and more predictable operation when your system encounters surge events or motor start‑ups.

What makes HLXD63B450 stand out

• Secure bolt‑on mounting provides a rigid, vibration‑resistant bus connection that stays locked in under heavy equipment loads.
• Thermal‑magnetic trip delivers coordinated protection for branch circuits with clear, repeatable trip curves.
• 3‑pole design suits 3‑phase systems, ensuring synchronized disconnection across all phases.
• 450 A / 600 V rating targets heavy‑duty panelboard and loadcenter protection while meeting standard electrical distribution requirements.
• OEM compatibility is designed to work with matching Siemens panelboards and loadcenters for straightforward installation and reliable performance.
• Versatile applications suitable for residential, commercial, and light industrial environments where robust protection is essential.

Ideal use scenarios

• Protect main feeders and branch circuits in three‑phase panelboards in commercial spaces, such as offices, retail, and small industrial facilities.
• Replace or retrofit in existing Siemens OEM panels to maintain system protection and compliance.
• Use as a dedicated service disconnect or as part of a distributed protection scheme in light industrial equipment racks and electrical rooms.

Technical snapshot

• Manufacturer: Siemens
• Part number: HLXD63B450
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage rating: 450 A
• Voltage rating: 600 V
• Poles: 3
• Mounting style: Bolt‑on
• Application: Branch circuit overcurrent and short‑circuit protection

Installation and maintenance tips: Use the appropriate torque on mounting hardware as specified by Siemens for bolt‑on breakers, and pair this unit with compatible OEM loadcenters to ensure the protection curve remains aligned with your system's design. Regular inspection of bus connections and verifying trip unit calibration when applicable will help sustain reliable performance over the life of the installation.