Square D LI364001212 400A 3-Pole 600 V Circuit Breaker

Power protection you can rely on starts with the Square D LI364001212 400A 3-Pole 600V Circuit Breaker. Engineered for robustness in demanding environments, this unit delivers dependable short-circuit and overload protection for three-phase electrical systems.

With a 400-amp current rating and three poles, it is purpose-built to interrupt power on three-phase feeders and motors and to serve as a main disconnect in industrial or commercial panels that run on up to 600 volts.

Key specifications

• Part Number: LI364001212
• Current rating: 400 A
• Poles: 3
• Voltage rating: 600 V

Why this matters

Three-pole design provides synchronized interruption across all phases, reducing arcing risk and protecting three-phase equipment from unbalanced faults. For facilities like warehouses, manufacturing lines, and large HVAC systems, a 400A main breaker ensures fast isolation of faults, minimizing downtime and equipment damage. The LI364001212 is built for long service life in panel boards and switchgear, offering predictable performance when you need it most.

Ideal use cases

• Main disconnect in three-phase distribution panels up to 600 V
• Protection for feeders supplying large motors, conveyors, pumps, or air handling units
• Service entrance or main breakers in industrial control panels
• Retrofits or replacements in Square D and compatible panels that support LI-series breakers

Installation and compatibility tips

Consult a licensed electrician to confirm panel compatibility and proper installation. Ensure wiring aligns with the 400A rating, use appropriate conductor sizes, and follow manufacturer torque specifications. Keep spare LI364001212 on hand for reliable, quick replacement in critical systems.

Why choose Square D

Square D is a trusted name in electrical protection, delivering breakers that balance solid performance with durable construction. The LI364001212 combines a high 400A rating with a rugged three-pole design and 600V capability, making it a practical choice for modern, safety-focused electrical rooms.

Secure your power distribution with a dependable, readily available 400A 3-Pole 600V circuit breaker from Square D—the LI364001212.