Square D HDA36150U31X - 150 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D HDA36150U31X: a 150A, 600V, 3-pole plug-in molded case circuit breaker designed to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Its plug-in design accelerates installations and replacements, while the thermal-magnetic trip unit provides stable, repeatable protection across a range of operating conditions.

• Fast plug-in connection for quick installation and hassle-free replacement—seating securely into compatible Square D panelboards with minimal wiring complexity.
• Thermal-magnetic trip unit delivers precise, coordinated protection against both overcurrent and short circuits, helping to reduce nuisance trips and protect downstream equipment.
• OEM compatibility engineered to fit matching Square D load centers and panelboards, ensuring proper fit, reliable performance, and streamlined maintenance.
• 3-pole design provides full 3-phase protection for commercial and light industrial environments, suitable for feeding motors, compressors, and multi-branch circuits in distributed power systems.

Technical snapshot

• Manufacturer: Square D
• Part number: HDA36150U31X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 150A
• Voltage rating: 600V
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

This device is ideal for electrical professionals and facility teams seeking robust, scalable protection in residential, commercial, and light industrial applications. Use it to safeguard distribution feeders, protect motors and other high-inrush loads, or upgrade panelboards and load centers where quick replacement and reliable trip performance are critical.

Why choose the Square D HDA36150U31X

Unlike standalone or labor-intensive alternatives, this plug-in breaker simplifies upgrades and servicing in compatible panelboards, reducing downtime and maintenance costs. The 3-pole configuration ensures synchronized protection across all three phases, which is essential for balanced loads and motor-start scenarios. With a 150A rating at 600V, it’s built to handle demanding distribution networks in modern facilities while maintaining precise trip characteristics that protect both circuits and equipment.

Whether you’re wiring a new panel, expanding a distribution feed, or replacing a worn-out breaker, the HDA36150U31X from Square D offers a reliable, maintenance-friendly solution designed to integrate smoothly with existing Square D infrastructure and support a broad range of residential, commercial, and light industrial applications.