Square D | MX36300 | Circuit Breaker | 300A | 3-Pole | 600V

Meet the Square D MX36300 circuit breaker—a robust, high-current solution designed for demanding 600V electrical distributions. With a 300A rating and a 3-Pole configuration, this unit is built to reliably protect large feeders and essential machinery in industrial and commercial environments.

Designed for maintenance, retrofit, and replacement projects where exact compatibility matters, the MX36300 drops into Square D panels that call for the same specifications, ensuring consistent trip characteristics and dependable protection over time.

• Amperage: 300A
• Poles: 3-Pole
• Voltage: 600V
• Compatibility note: The part number MX36300 is the best reference for matching panels and breakers

Why this MX36300 makes sense for your system

• Exact fit for Square D panels that require MX36300, reducing guesswork during retrofits or replacements.
• Three-pole design supports balanced three-phase distribution, helping protect motors, compressors, and other high-current loads from overloads and faults.
• Durable construction designed for continuous operation in demanding environments, from manufacturing floors to large facilities.
• Clear guidance for procurement: confirm fit and ratings before ordering to avoid compatibility issues in the field.

Ideal use cases

• Replacing worn or damaged breakers in 3-phase 600V electrical systems.
• Retrofits that require exact MX36300 specifications to preserve panel protection profiles.
• New installations in facilities that rely on Square D equipment and need a 300A, 3-pole, 600V breaker.

Practical tips for installers

• Always verify that the panel and bus connections match the MX36300’s specs before purchasing.
• During replacement, power down the panel and follow lockout/tagout procedures to ensure safe work.
• Keep the exact part number MX36300 on file for future maintenance to prevent mismatches.