Square D | MA364001021 | Circuit Breaker | 400A | 3-Pole | 600V

Meet the Square D MA364001021 circuit breaker — a purpose-built protective device for demanding electrical runs. With a 400 A rating across 3 poles and a 600 V operating window, this breaker is designed to safeguard large commercial and light industrial circuits from overcurrent, helping prevent equipment damage and costly downtime.

This unit excels as a maintenance, retrofit, or replacement solution where exact spec matching matters. The MA364001021 part number is the best reference for compatibility, ensuring proper fit within Square D panels and downstream protection devices. Before ordering, confirm fit and ratings on your panel label and with your electrical contractor to avoid mismatches.

• Amperage: 400 A — robust protection for heavy loads and large motors.
• Poles: 3-Pole — suited for 3-phase distribution systems common in business facilities.
• Voltage: 600 V — supports standard distribution voltages used in commercial settings.
• Best use: Maintenance, retrofit, or replacement where a precise, identical part is required.
• Compatibility: Part number MA364001021 is your key reference for panel suitability; verify against your equipment's labeling and service documentation.

Practical tips for a smooth installation: power down the system following proper lockout/tagout procedures, verify the panel's rating and the breaker's trip characteristics with the panel's manufacturer data, and ensure correct mounting and secure connections per Square D guidelines. This precise-match breaker helps minimize downtime and ensures reliable, predictable performance across your distribution network.

Invest with confidence in a genuine Square D replacement that keeps your critical infrastructure protected and running. Add to cart to secure an exact-match MA364001021 that aligns with your 400 A, 3-Pole, 600 V requirements.