Square D HDA36125UN 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36125UN, a purpose-built circuit breaker designed to guard 3‑phase electrical systems against overloads and faults. With a 125 A current rating, a 3‑pole configuration, and a 600 V maximum rating, this unit delivers reliable protection for commercial and light industrial panels. Part number HDA36125UN is the exact specification you’ll want for replacements and upgrades in Square D installations.

Key specifications

• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Part Number: HDA36125UN
• Brand: Square D

What this means in practical terms: this 3‑pole breaker safeguards 3‑phase equipment by interrupting current during overloads or faults, helping protect motors, drives, and other critical loads in your distribution system. Its 600 V rating supports commercial and industrial environments that run multiple 3‑phase circuits, delivering dependable protection where it matters most.

Ideal use scenarios

• Replacing worn or outdated breakers in 3‑phase panels
• Protecting 3‑phase motor circuits and feeders up to 125 A
• Upgrading electrical infrastructure in commercial or light industrial settings operating up to 600 V

Why choose the HDA36125UN

• Exact compatibility with Square D installations, ensuring a reliable fit and consistent electrical performance
• Clear, unambiguous part identification with HDA36125UN to simplify ordering and maintenance
• A straightforward upgrade path for panels that require a robust 3‑pole, 125 A protection solution

Before installation, verify your panel compatibility with Square D components and consult your system diagrams to ensure the 3‑pole configuration and 125 A rating align with your circuit protection strategy. The HDA36125UN is a trusted choice for maintaining safe, continuous operation in demanding 3‑phase environments.