Westinghouse | HMA3300 | Circuit Breaker | 300A | 3-Pole | 600V | Bolt-On

Meet the Westinghouse HMA3300 Circuit Breaker—built for reliability in demanding 3‑phase electrical systems. This bolt‑on unit is designed for maintenance, retrofit, and replacement projects where exact specifications matter, helping you protect valuable equipment and keep critical circuits running smoothly.

• Three-pole design for true 3‑phase protection ensures coordinated interrupting across all phases, reducing imbalance and equipment stress.
• 300A amperage rating provides solid fault protection for high-current circuits without overloading the bus bar or conductors.
• 600V operating capacity suits common industrial and commercial panel boards, delivering dependable performance in demanding environments.
• Bolt-on mounting offers a secure, serviceable installation with a robust connection to your panel, simplifying field replacements and maintenance.
• Part number HMA3300 as the compatibility reference is your best guide to matching footprint and ratings for a precise, trouble‑free fit.

This breaker is ideal for:

• Retrofits in older Westinghouse panels or systems that require matching specs to maintain consistent protection.
• Replacement projects where a proven, durable 3‑pole, 300A, 600V bolt‑on solution is needed.
• Maintenance scenarios where planned openings and part exchanges minimize downtime while preserving electrical integrity.
• Upgrades for circuits that demand higher reliability and coordinated trip behavior across all phases.

How to verify fit and ensure safe, compliant installation:

• Match the amperage (300A), number of poles (3), voltage rating (600V), and mounting style (bolt‑on) to your panel’s specifications.
• Use the part number HMA3300 as the primary reference for compatibility checks with your existing equipment.
• Confirm that the panel and bus bar footprint align with the bolt‑on mounting configuration before ordering.
• Follow local electrical codes and, if possible, involve a qualified electrician to confirm site compatibility and safe installation.

Why choose the Westinghouse HMA3300 for your panel needs? It pairs a precise 3‑pole, 300A, 600V specification with a practical bolt‑on design, delivering straightforward retrofit and replacement experiences while maintaining reliable protection across your three‑phase systems. When exact compatibility matters, relying on the HMA3300 part reference helps you avoid mismatches and unnecessary downtime.