Square D HGA36125UN 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HGA36125UN 125A 3-Pole 600 V Circuit Breaker — a purpose-built protection device designed to guard three-phase electrical systems up to 600 volts. With a 125-amp rating and a 3-pole configuration, this breaker provides clean, reliable isolation for demanding industrial and commercial applications. Part Number HGA36125UN sits at the core of your electrical distribution, delivering consistent protection where it matters most.

What this circuit breaker does: it monitors current in a three-phase circuit and interrupts power when a fault is detected, safeguarding wiring, motors, and downstream equipment from damage due to overloads or short circuits. Built to fit standard Square D panels, it's a straightforward upgrade or replacement for existing 3‑pole 600 V protection solutions.

Key specifications

• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HGA36125UN
• Brand: Square D

Ideal use cases

Best suited for service panels and distribution boards where three-phase power is present, such as lighting and motor circuits, small industrial equipment feeds, and commercial facilities with 3-phase loads. The 125A rating makes it appropriate for main or feeder protection in medium-duty applications, helping you consolidate protection in a single, reliable device.

Why this model stands out

• Direct representation of Square D's engineering approach in a compact, 3-pole form factor, designed for dependable operation in 600 V systems.
• Clear, unambiguous part number (HGA36125UN) for easy ordering, cross-referencing, and replacement planning.
• Simple integration into existing Square D panels, reducing compatibility concerns during upgrades or refurbishments.

Installation and maintenance tips

Refer to the manufacturer's data for wiring terms, torque specifications, and mounting requirements. Ensure the panel rating matches the 600 V system voltage and that the 125 A capacity aligns with downstream load calculations. Regular checks for signs of wear, overheating, or tripping events will help maintain reliable protection.