Square D HDA36110UH 110A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36110UH 110A 3-Pole 600 V Circuit Breaker—the reliable core of 3-phase protection for commercial and light industrial electrical systems. With a 110 A rating, three poles, and a 600 V maximum voltage, this breaker is built to safeguard equipment and maintain steady, safe power distribution in demanding environments.

Key specs at a glance

• Current rating: 110 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HDA36110UH
• Brand: Square D

Purpose and ideal applications

Designed for 3-phase electrical installations, this circuit breaker provides dependable overcurrent protection for circuits and equipment operating at up to 600 V. It’s an excellent fit for panels and distribution boards that require a 3-pole configuration to manage balanced, multi‑phase loads. Use cases include protecting motors, conveyors, HVAC equipment, and other machinery common in commercial facilities and light industrial settings where reliable interruption of fault or overload conditions is essential.

What makes this breaker stand out

• Exact-fit compatibility: Part number HDA36110UH specifies a 3-pole, 110 A design suitable for 3-phase distribution environments, simplifying panel fulfillment and spare-part planning.
• Clear voltage ceiling: Rated for systems up to 600 V, giving you flexible deployment across a wide range of commercial and industrial installations.
• Direct, practical protection: By limiting current to 110 A, it helps prevent overheating, equipment damage, and safety hazards from overcurrent events in multi-phase circuits.

Practical considerations and tips

When selecting this breaker, confirm that your electrical setup is a 3-phase system and that the panel accepts Square D HDA-series devices. The 600 V rating ensures compatibility with higher-voltage distributions typical in commercial environments, while the 110 A capacity is well-suited for mid-sized loads and equipment groups. For installation planning, consider grouping loads to maintain balanced phase currents and reduce the risk of nuisance trips in heavily loaded circuits.

Why choose Square D for this application

Square D has a long-standing reputation for dependable electrical protection solutions. The HDA36110UH embodies that reliability in a 3-pole, 110 A, 600 V package, delivering straightforward protection for 3-phase systems without unnecessary complexity. If you’re modernizing a panel, retrofitting an older installation, or ensuring safer operation of critical equipment, this breaker offers a solid, purpose-built option that aligns with standard 3-phase distribution practices.