Westinghouse | 504C740G28 | Circuit Breaker | 400A | 3-Pole | 600V | Bolt-On

The Westinghouse 504C740G28 is a high-capacity circuit breaker designed for demanding 3-phase electrical systems. Built for 400A service, its three-pole configuration and 600V rating make it a solid choice for maintenance, retrofit, and replacement projects where precise specifications matter and reliability is essential.

Key specs at a glance

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

Best reference for compatibility is the part number 504C740G28. To avoid mismatches, confirm fit and ratings before ordering.

What sets this breaker apart

• Bolt-On mounting provides a secure, straightforward connection to compatible panels, reducing installation time and ensuring solid bus-bar contact.
• 3-Pole design supports 3-phase systems, delivering coordinated protection for multi-wire equipment and large motors common in industrial or commercial environments.
• High-current capability with a 400A rating makes it suitable for main feeders and heavy-duty protection where components demand robust interruption capacity.
• 600V operation aligns with higher-voltage panel configurations, enabling reliable interruption and protection across demanding applications.

Ideal use cases

This breaker is well-suited for retrofit and replacement scenarios where a bolt-on, 3-pole, 400A, 600V solution is required. Think industrial machines, manufacturing lines, and commercial electrical panels that rely on dependable, high-capacity protection. It also serves as a compatible upgrade or service-dispatch component in systems designed around the 504C740G28 specification.

Practical considerations

Before purchasing, verify that your panel accepts bolt-on breakers of this frame and rating. The 504C740G28 is specified for 3-pole, 600V service and should be matched to applications that demand robust, coordinated protection across all three phases. When in doubt, use the part number (504C740G28) as the primary compatibility reference to ensure a precise fit.

Installation tips and best practices

For reliable performance, ensure the power is fully de-energized and follow your panel’s installation guidelines. Confirm the breaker mounting type (bolt-on) matches your panel, and verify conductor sizing and torque specifications per the manufacturer’s documentation. Proper alignment with the bus bars is essential to maintain uninterrupted protection and to prevent arcing or improper trips during faults.