Square D HDA36110UN 110A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36110UN 110A 3-Pole 600 V Circuit Breaker — a rugged, three-phase protection device from Square D designed to keep your power distribution safe and resilient. This unit is the exact part number HDA36110UN, built to slot into compatible Square D panels and enclosures without fuss.

Key specifications

• Current rating: 110 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HDA36110UN
• Brand: Square D

What it protects and where to use

Designed for three-phase electrical systems, this 3-pole breaker guards motors, pumps, and other heavy-load equipment from overloads and short circuits. With a 600 V maximum rating, it's well-suited for industrial and commercial distribution networks, including motor control centers, large HVAC installations, and other three-phase circuits that demand reliable protection at higher voltages.

Why this model stands out

• Direct replacement part for Square D panels that specify HDA36110UN, ensuring a precise fit and predictable trip characteristics.
• Balanced protection across all three phases, helping prevent uneven loading and nuisance trips on multi-motor or multi-branch systems.
• Durable construction designed for long service life in demanding environments—manufactured to maintain performance over time.

Practical considerations

Installation should be performed by a licensed electrician. Confirm panel compatibility before installation and follow the enclosure’s guidelines for mounting, wiring, and torque. Keep labeling up to date to reflect the protective device in use for safety and maintenance reviews.