Square D HDA36090UN 90A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36090UN 90A 3-Pole 600 V Circuit Breaker — a purpose-built protection device for demanding three-phase systems. With a 90 amp current rating and a 600 V maximum, this breaker is engineered to safely interrupt fault currents and shield equipment in commercial and industrial environments. The part number HDA36090UN is your assurance of a precise replacement that fits compatible Square D panel configurations.

• Current rating: 90 A
• Poles: 3 (three-pole configuration for balanced three-phase protection)
• Voltage rating: 600 V
• Part number: HDA36090UN

Why this 3-Pole, 90A, 600 V breaker matters

In three-phase networks, a 3-pole breaker like the HDA36090UN ensures synchronized disconnection of all phases, reducing the risk of unbalanced faults and equipment damage. The 90 A rating makes it well-suited for motor feeders, pump circuits, HVAC equipment, and other loads that draw substantial current in industrial or large commercial environments. Designed for compatibility with Square D panels, it provides a reliable upgrade or replacement option when you need robust, coordinated protection across all three phases.

Ideal use cases

• Motor control centers and feeder circuits for compressors, pumps, fans, and conveyors
• Commercial or light-industrial distribution panels requiring reliable three-phase protection
• Panel replacements where a 90 A, 3-pole, 600 V protection device is specified

Practical considerations and tips

• Verify panel compatibility with this HDA-series configuration to ensure a proper fit and reliable operation.
• Plan for three-phase protection where unbalanced faults could impact connected motors and equipment.
• When replacing an older breaker, match not only voltage and current ratings but also the physical style and mounting to avoid installation issues.
• Follow all local electrical codes and manufacturer installation guidelines for safe handling and secure connections.

Choosing the Square D HDA36090UN means selecting a trusted solution for protecting three-phase circuits at up to 600 V. It’s the right choice when you need dependable, coordinated interruption across all phases to safeguard motors, drives, and heavy loads in demanding environments.