Square D | MA365001021 | Circuit Breaker | 500A | 3-Pole | 600V

When your electrical distribution system demands a dependable, exact-match replacement, the Square D MA365001021 circuit breaker is built to deliver. This 500A, 3-pole unit is designed for 600V systems and is ideal for maintenance, retrofit, and replacement projects where precise specifications matter. With this breaker, you can restore safety, reliability, and smooth operation to demanding applications without overhauling your panel architecture.

Key specifications

• Amperage: 500 A
• Poles: 3-Pole
• Voltage: 600 V

Why this MA365001021 matters

• Exact part reference: The MA365001021 part number is the most reliable compatibility reference for matching breakers to Square D panels and switchgear.
• Purpose-built for retrofit and replacement: Specifically chosen for projects where you need to preserve ratings and performance without modifying the electrical environment.
• Durable, high-current capability: With a 500 A rating, it’s equipped to handle the demanding profiles common in commercial and industrial settings.

Ideal use cases

• Maintenance of existing Square D installations in manufacturing facilities, warehouses, or data centers
• Retrofit projects that require upgrading to a 3-pole, 600V distribution breaker
• Replacement of aging breakers in 3-phase power panels while maintaining the original bus configuration

Installation guidance and best practices

Before purchasing, verify fit and ratings against your panel’s documentation. Using the exact part number MA365001021 as the compatibility reference helps ensure proper mounting, terminal alignment, and electrical compatibility. When replacing a legacy breaker, compare the panel catalog designation with the MA365001021 listing to confirm interchangeability.

Practical tip: keep the manufacturer’s specification details on hand during replacement projects to validate rating, configuration, and mounting orientation. This approach minimizes downtime and supports a safe, compliant installation.

What you gain with this Square D solution

A precise, ready-to-install breaker that aligns with your existing 600V, 3-phase infrastructure, supporting reliable protection and streamlined maintenance workflows. The MA365001021 is not a generic substitute—it’s a targeted, specification-driven choice designed to protect your equipment, personnel, and productivity.