Square D MH36400 - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D MH36400—a rugged 400 A, 3-pole plug-in molded case circuit breaker designed to protect your electrical distribution with precision. Built for dependable branch circuit overcurrent and short-circuit protection, this unit fits seamlessly into panelboards and load centers, keeping critical circuits safeguarded in demanding environments.

Key benefits that matter in real-world setups

• Fast plug-in connection for quick installation and streamlined replacements, minimizing downtime during upgrades or service calls.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding appropriately to overloads and sudden short circuits, even as ambient conditions change.
• 3-pole configuration suited for 3-phase systems, enabling coordinated protection for motors, feeders, and commercial-scale circuits.
• OEM-compatible design guarantees reliable fit and performance with matching Square D load centers and panelboards, preserving listings and ensuring proper bus compatibility.
• High-capacity protection—400 A rating makes it ideal for main disconnects or feeder protection in residential, commercial, and light industrial applications.

What problems does it solve?

When overcurrent or a short circuit arises, the MH36400 steps in to interrupt power quickly and safely, reducing the risk of overheating, equipment damage, and downtime. Its plug-in format simplifies field service, while the thermal-magnetic mechanism provides predictable tripping behavior across a range of fault conditions. For facilities that rely on reliable power distribution, this breaker offers a durable, maintenance-friendly solution that’s designed to integrate with existing Square D panel ecosystems.

Ideal use cases

• Main disconnects or feeder protection in commercial panelboards and load centers
• Three-phase motor circuits and heavily loaded distribution feeds
• Residential or light industrial subpanels requiring robust 400 A protection
• Situations demanding quick field replacement without rewiring, thanks to the plug-in design

Technical specifications at a glance

• Manufacturer: Square D
• Part Number: MH36400
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 400 A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection
• Suitable for: Residential, commercial, and light industrial environments

Choose the Square D MH36400 when you need a dependable, high-capacity, plug-in MCCB that integrates smoothly with Square D panelboards and load centers. Its fast installation, predictable thermal-magnetic protection, and robust 3-pole design make it a practical, long-term solution for demanding electrical systems.