Westinghouse | MA3450S | Circuit Breaker | 450A | 3-Pole | 600V | Bolt-On

The Westinghouse MA3450S Circuit Breaker is a rugged, bolt-on protection device designed for demanding electrical environments. With a 450A rating, a 3-pole configuration, and 600V capacity, this breaker is built for reliable overcurrent protection in maintenance, retrofit, and replacement projects where exact specifications matter.

Key specifications

• Amperage: 450 A
• Poles: 3-Pole
• Voltage: 600 V
• Mounting: Bolt-On
• Part number: MA3450S

Why the bolt-on design matters

The bolt-on mounting provides a secure, vibration-resistant connection to compatible bus bars, which is crucial in high-demand installations. This design simplifies field replacement and maintenance, reducing downtime and ensuring consistent protection for your feeders and main service circuits in industrial and commercial settings.

Ideal applications

• Main service disconnects in commercial facilities and light manufacturing
• Retrofit projects where hardware must match MA3450S specifications or compatible Westinghouse gear
• Spare parts inventory for scheduled maintenance programs
• Feeder protection in large distribution panels for warehouses, data centers, and industrial spaces

How it compares to alternatives

For installations requiring robust, long-lasting mounting, the 3-Pole bolt-on MA3450S offers a tangible advantage over other form factors that may require different mounting hardware or present greater risk of loosening over time. This model is designed to deliver dependable interrupting performance at 600V, making it a practical choice when the existing panel specification calls for a MA3450S-compatible bolt-on solution.

Important fit and safety notes

Always verify fit and ratings against your equipment before ordering. The MA3450S part number is the most reliable reference for compatibility with Westinghouse panels and chassis designed for bolt-on protection devices of this spec.

Practical installation tips

• Ensure the electrical system is fully de-energized and follow proper lockout/tagout procedures before installation.
• Inspect the breaker and mounting hardware for integrity and corrosion prior to mounting.
• Confirm three-pole alignment with the panel’s bus bars to ensure a secure, proper connection.
• After installation, perform verifications of tripping characteristics and system safety checks by a qualified technician.