Square D | MJA263002 | Circuit Breaker | 300A | 2-Pole

Meet the Square D MJA263002 circuit breaker—a genuine, high-current protection device engineered for reliability in demanding electrical systems. This 300A, 2-pole unit is built for maintenance, retrofit, and replacement projects, delivering a precise fit and dependable performance when matching specs matters most.

Exact fit and compatibility

• Part number accuracy: MJA263002 is your best reference for compatibility. Use the exact model to ensure proper fit, trip characteristics, and mounting alignment within compatible Square D panels.
• Verification before ordering: Confirm the panel rating and slot configuration align with a 2-pole, 300A device to avoid mismatches during installation.

What makes this breaker stand out

• Genuine Square D engineering: Designed to integrate seamlessly with existing Square D systems, reducing downtime and compatibility issues.
• High-current protection: 300A capacity protects large feeders and critical circuits, helping to safeguard equipment and maintain service continuity.
• Two-pole configuration: Ensures simultaneous disconnection of both hot legs, delivering balanced protection for 240V circuits.
• Maintenance-ready and retrofit-friendly: Ideal for refreshing aging panels or upgrading to meet evolving load demands without extensive panel modification.

Practical use cases

Perfect for replacing worn or obsolete breakers in mid-to-large commercial or industrial panels, retrofitting for higher-capacity circuits, or restoring service after an outage where exact specifications are critical. If you’re upgrading a panel to support new equipment or expand capacity, this 300A 2-pole unit offers a reliable, plug-in solution when the MJA263002 matches your system’s requirements.

Specifications at a glance

• Amperage: 300A
• Poles: 2-Pole
• Brand: Square D
• Part number: MJA263002

Installation and safety notes

Always prioritize safety and proper installation. Before purchasing, verify panel compatibility using the panel labeling or service manual, and ensure the panel accepts MJA-series breakers. For complex retrofits or high-load applications, consult a licensed electrician to perform the install and testing to meet electrical code requirements.