Square D HDA36100UH 100A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36100UH — a purpose-built 3-pole circuit breaker designed to safeguard your three-phase power distribution. With a 100 A rating and a 600 V maximum, this unit is tailored for demanding commercial and light-industrial environments where reliable protection is essential.

• Current rating: 100 A
• Pole configuration: 3-pole
• Voltage rating: 600 V
• Part number: HDA36100UH

Why this 3-pole breaker stands out

In three-phase systems, a 3-pole design ensures all live conductors are disconnected simultaneously when an overload or fault occurs. This synchronized trip minimizes backfeed risk, protects downstream equipment, and helps you maintain safer, more predictable power distribution. The HDA36100UH is built to endure the rigors of busy electrical rooms and manufacturing floors while delivering dependable interruption when you need it most.

Ideal for who and where

This breaker is an excellent fit for electricians, panel builders, and facility technicians who manage 3-phase feeders in:

• Commercial buildings with three-phase distributions
• Industrial equipment and motor circuits
• HVAC and large refrigeration systems
• Data centers and processing facilities requiring reliable phase protection

Practical value and use cases

Use the Square D HDA36100UH to:

• Protect feeders and motors from overloads and short circuits in 3-phase panels
• Upgrade or replace aging breakers to restore consistent protection in existing Square D installations
• Ensure coordinated disconnection across all three lines, reducing the risk of equipment damage during faults

Installation and care considerations

For best results, confirm panel compatibility with HDA-series devices and follow standard electrical codes for installation. When replacing, ensure terminals are clean and torqued to the manufacturer’s specifications, and test the circuit after installation to verify proper operation. Regular inspections should focus on any signs of wear, corrosion, or frequent nuisance tripping, which can indicate underlying electrical issues needing attention.

Specifications at a glance

Product: Square D Circuit Breaker, HDA36100UH

Current rating: 100 A

Poles: 3

Voltage rating: 600 V

Category: Industrial/Commercial 3-phase protection

When you need reliable, three-phase protection that clears faults quickly and protects valuable equipment, the Square D HDA36100UH 100A 3-Pole 600 V Circuit Breaker delivers dependable performance, compatibility with Square D installations, and the confidence of proven electrical protection for your power distribution system.