Square D HDA36125SH 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36125SH, a rugged three-pole circuit breaker designed to guard 3-phase power systems with precise, reliable protection. With a 125 A current rating and a 600 V maximum, this unit is built for demanding industrial and commercial applications where safe, controlled shutdown is critical.

• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HDA36125SH

Why this breaker matters for your system

• 3-pole design provides synchronized protection across all phases, helping prevent unbalanced loads and protecting motors, drives, and feeders from overloads and faults.
• Designed for compatibility with Square D panels and enclosures that support the HDA family, simplifying replacement, upgrades, and inventory management.
• 125 A capacity makes it a practical choice for feeders and larger branch circuits in mid-size industrial setups or commercial power centers.

Ideal use scenarios

• Main or feeder protection in 3‑phase distribution panels for manufacturing lines, processing equipment, or HVAC systems.
• Replacement part in existing Square D installations that require a reliable 125 A, 3-pole, 600 V protection device.
• Critical safety component in service disconnects and electrical rooms where robust protection translates to uptime and safer maintenance.

Key considerations for installation and compatibility

• Ensure the enclosure or panel accepts HDA-series breakers and that mounting and bus connections align with your specific Square D setup.
• Install by qualified personnel in accordance with local electrical codes and manufacturer installation guidelines to ensure proper performance and safety.

Choose the Square D HDA36125SH when you need dependable, three-phase protection that aligns with established Square D engineering and your 125 A protection requirements. It’s a precise, purpose-built solution for reliable power distribution in industrial and commercial environments.