Westinghouse | 371D426G03 | Circuit Breaker | 400A | 3-Pole | 600V | Bolt-On

Meet the Westinghouse 371D426G03 Circuit Breaker—a robust, high-capacity protection solution crafted for demanding electrical systems. With a 400A rating, 3 poles, and a 600V capability, this bolt-on breaker is purpose-built for maintenance, retrofit, and replacement projects where exact specs and dependable performance matter.

Key specifications at a glance

• Amperage: 400A
• Poles: 3-Pole
• Voltage: 600V
• Mounting: Bolt-On
• Part number: 371D426G03

Why this Westinghouse breaker stands out

Designed for serious, real-world use in industrial and commercial environments, the 371D426G03 delivers authoritative current protection for 3-phase circuits. The bolt-on design provides a secure, vibration-resistant connection that’s ideal for panels and switchboards exposed to regular maintenance or retrofit work. By matching precise amperage, pole count, and voltage, it ensures consistent trip characteristics and reliable protection for high-demand equipment and motors.

Ideal use cases

• Retrofits and replacements in Westinghouse-compatible panels where a 400A, 3-pole, 600V bolt-on breaker is required
• Maintenance projects on industrial control panels, manufacturing lines, or power distribution subsystems
• New installations that demand a dependable, high-current protective device for 3-phase distribution

Installation & compatibility notes

Before ordering, confirm fit and ratings to ensure seamless integration with your existing panel. The part number 371D426G03 serves as the most reliable reference for compatibility. Verify that your panel accepts bolt-on breakers and that a 600V rating aligns with your system’s specification and safety standards.

Practical guidance for safe, effective use

• Power down and lockout/tagout the circuit before installation or replacement.
• Cross-check the breaker’s amperage, voltage rating, and pole configuration against your panel’s requirements.
• Follow the panel manufacturer’s torque and mounting guidelines to ensure a secure connection.
• Keep a record of the part number (371D426G03) for future maintenance and replacements.

For reliable protection in high-demand, 3-phase environments, the Westinghouse 371D426G03 Circuit Breaker offers a precise, durable solution that’s built to perform under the stresses of commercial and industrial use.