Square D | MA264001021 | Circuit Breaker | 400A | 3-Pole | 600V

Protect demanding electrical loads with the Square D MA264001021 Circuit Breaker — a robust 400 A, 3-Pole device rated for 600 V. Engineered for maintenance, retrofit, and replacement tasks, this breaker delivers dependable protection where exact specifications matter, helping keep critical circuits safe and uninterrupted.

Why this model stands out is its precise compatibility. The MA264001021 part number is the clearest reference for matching your existing Square D installation, enabling a straightforward swap-in when you’re upgrading or replacing worn or outdated components. Built to handle large feeder circuits, this three-pole design ensures balanced protection across multi-phase systems.

Key specifications

• Amperage: 400 A
• Poles: 3-Pole
• Voltage rating: 600 V
• Part number: MA264001021
• Type: Circuit Breaker suitable for Square D panels and compatible environments

Ideal use cases

• Maintenance on existing Square D distributions where a 400 A, 3-pole, 600 V breaker is required
• Retrofit projects upgrading feeder protection to a higher-capacity, multi-pole solution
• Replacement of worn or failed breakers in large-scale electrical installations that operate at 600 V

How to verify fit

Before ordering, confirm that your equipment matches the exact specifications: 400 A capacity, 3-pole configuration, and 600 V rating. The MA264001021 part number is the most reliable reference for compatibility, ensuring a seamless fit with your existing Square D hardware and panel labeling.

Installation considerations

When installing, follow standard electrical safety practices and ensure you’re working with a panel that supports a 3-pole, 600 V protection device. For professional results, rely on a licensed electrician to verify circuit ratings, torque requirements, and proper panel compatibility.

Choose the Square D MA264001021 circuit breaker for reliable, high-capacity protection in industrial and commercial electrical systems, backed by a part-number-for-compatibility approach that simplifies maintenance, retrofit, and replacement projects.