Square D HLA36150U31XAA 150A 3-Pole 600 V Circuit Breaker

Meet the Square D HLA36150U31XAA, a rugged 150 A circuit breaker engineered for reliable three-phase protection in demanding electrical environments. With a 3-pole design and a 600 V maximum rating, this breaker is purpose-built to safely interrupt and isolate fault currents across all three phases, helping safeguard motors, panels, and connected equipment.

Why this breaker stands out

Designed by Square D to deliver consistent performance in commercial and light industrial applications, the HLA36150U31XAA provides precise overcurrent protection for three-phase circuits. The 150 A rating pairs with its 3-pole configuration to ensure simultaneous disconnection of all phases, reducing risk of phase-to-phase faults and equipment damage. The 600 V rating broadens its suitability for higher-voltage distribution scenarios, making it a dependable choice for panel boards and distribution systems that require robust protection without compromise.

Key specifications at a glance

• Brand: Square D
• Part Number: HLA36150U31XAA
• Current rating: 150 A
• Pole configuration: 3-Pole
• Voltage rating: 600 V

Ideal use cases

• Three-phase power distribution in commercial buildings and light industrial facilities
• Protection for motor control circuits and feeders in panels designed for 600 V systems
• Replacement or upgrade of aging or undersized breakers in Square D panel boards to maintain consistent protection

How it helps you manage risk

The 3-pole configuration ensures that all live conductors are simultaneously disconnected during a fault, which minimizes residual energy and helps prevent dangerous arc events. By selecting a breaker that matches your system’s three-phase architecture, you gain predictable tripping behavior and alignment with standard electrical distributions used in many commercial and industrial environments.

Practical guidance for installation and compatibility

Use this breaker in panels and systems rated for 600 V and compatible with Square D components. The HLA36150U31XAA designation ensures you’re selecting the exact replacement or upgrade for existing installations that specify this part number, helping eliminate guesswork during maintenance or expansion projects. Follow the manufacturer’s installation guidelines and torque specifications to maintain optimal performance and safety.

Whether you’re upgrading an existing three-phase feeder, protecting critical machinery, or expanding a distribution panel, the Square D HLA36150U31XAA 150 A, 3-Pole, 600 V circuit breaker is a precise, dependable choice for robust electrical protection that keeps systems running smoothly.