Square D MA36300 - 300 A, 3-Pole Plug-In Circuit Breaker | AmpState

The Square D MA36300 is a 300A, 3-pole plug-in molded case circuit breaker engineered to protect panelboards and load centers from overcurrent and short-circuit events. Designed for fast, painless installation and effortless replacement, this breaker keeps critical electrical systems running with minimal downtime.

Why this breaker stands out

• Fast plug-in connection enables swift installation and simple swap-out during maintenance or upgrades, reducing service interruptions.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding precisely to both gradual overloads and sudden short circuits.
• 3-pole design provides balanced, three-phase protection suitable for a variety of commercial and light industrial applications.
• 300A rating handles substantial branch circuit protection, aligning with larger distribution panels and heavy-duty layouts.
• OEM-ready compatibility is engineered to work with matching Square D OEM load centers and panelboards, ensuring a seamless integration.
• Versatile application suitable for residential, commercial, and light industrial environments where reliable overcurrent and short-circuit protection is essential.

Technical specifications at a glance

• Manufacturer: Square D
• Part number: MA36300
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 300A
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal applications and benefits

This plug-in breaker shines in panelboard and loadcenter upgrades, new construction, and service upgrades where a robust 3-pole solution is required. Use cases include protection of large branch circuits in commercial spaces, distribution to multi-area facilities, or any setup demanding dependable three-phase protection with quick replacement capabilities. The plug-in design minimizes downtime during maintenance, while the thermal-magnetic trip ensures dependable performance across a range of fault conditions.

Practical considerations and setup tips

For optimal results, pair the MA36300 with compatible Square D OEM load centers and panelboards to maintain coordinated protection and electrical Code compliance. When replacing a breaker, ensure the panelboard is de-energized and follow all safety protocols. This unit is designed for environments where a robust, high-capacity 3-pole solution is required, balancing reliability with straightforward installation.