Square D LHL3640022M Circuit Breaker, 400A, 3-Pole

The Square D LHL3640022M Circuit Breaker is a rugged 400A, 3-pole solution designed for demanding industrial electrical service, maintenance, and replacement projects. Built on the trusted LAL thermal-magnetic platform, this unit delivers reliable protection for large three‑phase loads while keeping critical systems safe from overloads and short circuits. Use the part number LHL3640022M to confirm exact fit and compatibility with your panel and application.

Key advantages that matter in the field

• 400 A rating supports heavy-duty, three-phase equipment such as motors, conveyor systems, pumps, and processing lines without nuisance trips.
• 3-pole design provides synchronized disconnection across all three phases, enhancing personal and equipment safety in 3‑phase power networks.
• Thermal-magnetic protection combines overload (thermal) sensing with fast magnetic tripping for immediate isolation during short circuits, minimizing damage and downtime.
• Industrial reliability from Square D, a long-standing leader in electrical protection and panel solutions, designed to integrate with LAL family panels and replacement parts.
• Verified compatibility ensure proper fit by matching the part number (LHL3640022M) with your application requirements and panel specs.

What it’s ideal for

• Replacing aging or failed breakers in industrial control panels and switchgear.
• Protection for large motors, fans, and other high‑demand equipment on manufacturing floors.
• Upgrade scenarios where a robust, three‑phase, 400A protection device is needed to maintain uptime and safety.

Specification snapshot

• Manufacturer: Square D
• Series: LAL Thermal Magnetic Circuit Breaker
• Part Number: LHL3640022M
• Amperage: 400 A
• Poles: 3
• Product Type: Circuit Breaker

Installation and compatibility notes

Verify fit by part number and application requirements before installation. This unit is associated with the LAL thermal-magnetic family, offering balanced protection for high‑demand, three‑phase systems. If you’re unsure about compatibility with your current panel or need assistance confirming a match, our team can help confirm the right part number and installation approach.