Square D | MA263001121 | Circuit Breaker | 300A | 3-Pole | 600V

Square D MA263001121 Circuit Breaker is a robust, industrial-grade protection device designed for demanding electrical systems. Rated for 300 amps and featuring a 3-pole configuration for three-phase circuits, this 600V breaker provides reliable overcurrent protection for power distribution panels, retrofit projects, and replacement missions where exact specifications matter.

• Amperage: 300 A
• Poles: 3-Pole
• Voltage rating: 600 V
• Part reference: MA263001121 (best compatibility reference)
• Applications: maintenance, retrofit, and replacement needs

This breaker is purpose-built for environments where three-phase power drives critical equipment—from industrial motors and conveyors to large HVAC and processing lines. It delivers precise tripping performance to minimize downtime and protect both personnel and assets in daily operations and during fault events.

Compatibility and ordering notes: Confirm fit and ratings before ordering. The MA263001121 part number is the most reliable reference when matching breakers to panels or enclosures, helping you avoid mismatches in model, mount style, or bus configuration.

Ideal applications

• Maintenance and retrofit projects in commercial or industrial facilities
• Replacement of obsolete or worn 300A, 3-pole 600V breakers
• Upgrading protection in existing three-phase distribution systems

Practical considerations for installation

Before swapping in this breaker, verify that the panel or switchgear supports a 3-pole, 600V device and that the service or feeder rating aligns with 300A. Plan for proper safety procedures during installation, and ensure the panel’s bus configuration matches the device’s mounting style to maintain correct electrical clearance and safe operation.