Square D LGA36400U33X - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState

The Square D LGA36400U33X is a 400 A, 3-pole plug-in molded-case circuit breaker designed to deliver dependable branch-circuit overcurrent and short-circuit protection inside panelboards and load centers. Built for fast, field-friendly service, this device makes installation or replacement straightforward, minimizing downtime while maintaining superior protection for your electrical distribution.

• Fast plug-in connection: a streamlined installation and quick replacement process that keeps your project on track.
• Thermal-magnetic trip unit: provides stable, repeatable protection by combining thermal overload sensing with magnetic instantaneous trip for rapid short-circuit response.
• OEM-compatible design: engineered to fit with matching Square D panelboards and load centers, ensuring coordinated performance and effortless integration.
• Versatile application: suitable for residential, commercial, and light industrial environments where robust circuit protection is essential.

Specifications

• Manufacturer: Square D
• Part Number: LGA36400U33X
• 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

Why this breaker matters

When your panelboard or load center relies on robust protection for high-current circuits, the LGA36400U33X delivers. Its plug-in design reduces service time during upgrades or replacements, while the thermal-magnetic trip unit ensures dependable protection that responds appropriately to both overloads and short circuits. By matching Square D panelboards and load centers, it helps maintain proper coordination with upstream devices and downstream protection, supporting safer, more reliable power distribution across your facility.

Ideal use scenarios

• Upgrading or maintaining heavy-load residential distribution where a 400 A, 3-pole unit is required.
• Commercial panelboards that demand quick, secure plug-in protection with OEM compatibility.
• Light industrial applications needing durable, high-current branch-circuit protection with fast serviceability.

Practical tips for installation and care

Ensure work is performed by qualified personnel in accordance with local electrical codes. Verify that the panelboard is rated for 400 A and that the LGA36400U33X matches the original specification. Use the plug-in method as intended to minimize downtime during swaps, and perform a full system check after installation to confirm proper tripping behavior and secure mounting.