Square D MGA36300 - 300 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

When you need dependable branch-circuit protection for panelboards and load centers in residential, commercial, or light industrial settings, the Square D MGA36300 arrives through AmpState. This 3-pole plug-in molded case circuit breaker is rated at 300 A and 600 V, built to interrupt faults quickly and safely while preserving system continuity.

Why this breaker stands out

• Fast plug-in connection for rapid installation and simple field replacement, minimizing downtime during panel maintenance or upgrades.
• Thermal-magnetic trip unit combines thermal overload protection with instantaneous magnetic tripping for short-circuit events, delivering stable, repeatable protection you can rely on.
• 3-pole, 300 A, 600 V capability ideal for 3-phase feeders and main circuits in mid-size panels.
• OEM-loadcenter compatibility designed to fit with matching Square D OEM load centers and panelboards, ensuring correct fit, mounting, and trip coordination.
• Versatile for multiple sectors suitable for residential, commercial, and light industrial installations where robust protection is required.

Technical snapshot

• Manufacturer: Square D
• Part number: MGA36300
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 300 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Who should consider it?

Electric contractors, facilities managers, and maintenance teams responsible for larger panelboards and load centers will value the combination of a high current rating with quick, reliable plug-in installation. If your system runs three-phase power and demands solid protection against overloads and faults, this MGA36300 is designed to keep equipment safe and downtime minimal.

Tips for best results

• Ensure your panelboard is compatible with Square D MGA-series breakers and rated for 600 V and 300 A service.
• Follow manufacturer torque specifications for plug-in breakers during installation to maintain secure connections.
• Keep spares on hand for rapid replacement during service windows to reduce downtime.