Westinghouse | 371D957G77 | Circuit Breaker | 225A | 600V | Bolt-On

Meet the Westinghouse 371D957G77 circuit breaker—a bolt-on, 225A device built for demanding 600V electrical distributions. Designed for maintenance, retrofit, and replacement projects where exact specifications matter, this breaker helps you safeguard critical loads while keeping downtime to a minimum. When accuracy of fit matters, this is the model you can rely on.

Key specifications

• Brand: Westinghouse
• Part number: 371D957G77
• Type: Circuit Breaker, Bolt-On
• Amperage: 225A
• Voltage rating: 600V
• Best use: Maintenance, retrofit, and replacement where exact specs are required

Why this model stands out

Designed for robust, secure mounting, the bolt-on (bolt-on) format delivers dependable mechanical contact and stability in panel boards that support this configuration. The 600V rating makes it suitable for mid- to high-voltage distributions, while the 225A capacity supports a wide range of commercial and light industrial circuits. Rather than a generic replacement, the 371D957G77 is a precise fit that aligns with Westinghouse engineering standards, helping you maintain electrical integrity and reliability in critical systems.

Ideal use cases

• Replacement in existing panels where the 371D957G77 specification is listed
• Retrofit projects upgrading aging breakers to meet current safety and performance requirements
• Maintenance cycles in industrial facilities, manufacturing lines, and commercial electrical rooms that operate at 600V
• Spare part for service technicians who manage Westinghouse-compatible panels and switchgear

Compatibility and fit guidance

Important: confirm fit and ratings before ordering. The part number 371D957G77 is the best reference for compatibility, ensuring seamless replacement without panel modification. If your documentation requires a bolt-on breaker with a 225A, 600V specification, this model is designed to meet that exact need.

Installation tips and best practices

• Power down the system and follow lockout/tagout procedures before servicing.
• Verify proper engagement with the panel’s bus structure and secure mounting hardware as specified by the panel manufacturer.
• Inspect surrounding wiring and terminals for wear or corrosion prior to replacement to ensure long-term reliability.
• Keep original packaging or manufacturer documentation on hand during installation to reference ratings and safety guidelines.

Whether you’re performing routine maintenance, upgrading an aging installation, or executing a precise replacement, the Westinghouse 371D957G77 bolt-on circuit breaker delivers the exact specifications and dependable performance needed for 600V systems at 225A. Use the part number as your main compatibility touchpoint, and choose a solution that’s engineered to integrate smoothly with your existing Westinghouse panel and load centers.