Square D HDA36125UR 125A 3-Pole 600 V Circuit Breaker

Square D HDA36125UR is a dependable circuit breaker designed to safeguard 3‑phase electrical systems. With a 125 A current rating and a 3‑pole configuration, this unit provides reliable overcurrent protection for circuits up to 600 V. Built to withstand demanding industrial and commercial environments, it’s a practical choice for panels that power motors, compressors, and other high‑demand equipment.

• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HDA36125UR
• Brand: Square D

This 3‑pole design provides synchronized protection across all three phases, helping to prevent uneven current draw and reduce the risk of arc faults in 3‑phase systems. It’s well suited for electrical distribution setups where robust protection is required for large motor drives, HVAC equipment, pumps, and other heavy loads operating at up to 600 V.

Ideal use scenarios

• Feeder protection for 3‑phase 600 V panelboards in manufacturing floors or processing facilities
• Motor control centers and large equipment rooms where reliable phase protection is critical
• Replacement or upgrade in existing Square D installations to maintain system compatibility

Why this model stands out

• Correlates directly with standard Square D panel systems, simplifying installation and replacement for maintained performance
• Clear, durable identification of the protection rating and configuration aids quick verification during maintenance
• Designed to handle the typical thermal and electrical stresses of 3‑phase, 125 A circuits, providing consistent protection over time

Practical considerations

• Ensure compatibility with your Square D panel or enclosure and verify mounting style and bus connection requirements for a seamless retrofit
• Plan for correct wiring to maintain polarity and meet local electrical codes and safety standards
• Inspect connections and terminations during installation to minimize resistance and heat buildup

Choose the Square D HDA36125UR when you need dependable, precise protection for 3‑phase, up to 125 A circuits at 600 V. It’s a purpose‑built solution for demanding electrical environments that demand consistent performance and straightforward compatibility with existing Square D infrastructure.