Square D Q432400 - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState

The Square D Q432400 400 A, 3-Pole Plug-In Molded Case Circuit Breaker is a rugged, high-capacity solution built to safeguard large branch circuits in panelboards and load centers. Designed for quick, decisive protection, this device blends a fast plug-in connection with dependable thermal-magnetic trip technology to handle both overloads and short-circuit events with consistent performance.

• Rapid plug-in installation: A streamlined connection reduces downtime during installs and replacements, helping you get power back up faster in commercial or industrial spaces.
• Thermal-magnetic trip unit: Combines steady thermal protection with instantaneous magnetic trip for reliable, repeatable performance across varying temperatures and load conditions.
• OEM-matched compatibility: Specifically designed to be used with matching Square D OEM load centers and panelboards, ensuring proper fit, electrical coordination, and listing compatibility.
• Versatile, heavy-duty protection: Ideal for residential, commercial, and light industrial applications where 400 A main or feeder protection is required for large distribution circuits.

What makes this 400 A, 3-pole plug-in breaker stand out? It’s purpose-built for demanding electrical layouts where fast serviceability and proven protection are essential. The three-pole design supports multi-wire branch circuits and balanced load distribution, while the molded-case construction provides robust durability in busy panel environments.

Practical use cases

• Upgrading or replacing aging main or feeder breakers in large residential or small-to-medium commercial panels.
• Installing in new panelboards that require a 400 A, 3-pole plug-in solution for centralized distribution.
• Maintaining reliability in light industrial settings where steady overload and short-circuit protection are critical for continuous operation.

Technical snapshot

• Manufacturer: Square D
• Part Number: Q432400
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Whether you’re performing a panel upgrade, stocking a service van for quick replacements, or configuring a new distribution center, the Square D Q432400 delivers reliable protection with a plug-in convenience that minimizes downtime. Trust in the proven performance of Square D—the right choice for dependable, scalable electrical protection in a variety of modern installations.