Square D HDA36125SL 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36125SL—a rugged 125A, 3-pole circuit breaker built for demanding three-phase power distributions. With a 600 V rating, this unit is designed to reliably protect feeders and large loads in commercial and industrial panels, MCCs, and other distribution setups. Its compact, sturdy construction is engineered to withstand the rigors of everyday electrical service while delivering dependable overcurrent protection.

Key specifications

• Part Number: HDA36125SL
• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V

Why this breaker stands out

This 3-pole design is purpose-built for three-phase systems, enabling synchronized disconnection across all phases for enhanced safety and system protection. The 125 A rating makes it ideal for mid-to-large feeders, motor circuits, and other substantial loads often found in manufacturing floors, large HVAC installations, and distribution panels. With a 600 V maximum, it aligns with common industrial power standards, ensuring compatibility with a wide range of equipment and panel enclosures.

Ideal use cases

• Protection for three-phase feeders in industrial control panels and motor control centers
• Back-up protection for commercial electrical rooms that distribute heavy loads
• Replacement or upgrade in existing Square D panel systems to maintain consistent protection and performance

What you gain in practical terms

Reliable overcurrent protection translates to fewer nuisance trips and safer shutdowns when faults occur. The HDA36125SL is designed to integrate smoothly with Square D distribution equipment, helping you maintain a cohesive, code-compliant electrical backbone. By safeguarding heavy-load circuits, it helps minimize downtime and equipment damage, supporting longer equipment life and improved system reliability.

Installation and care

Installations should be performed by a qualified electrician in accordance with local electrical codes and the manufacturer’s guidelines. Ensure proper mounting within suitable enclosures and verify compatibility with your existing Square D components for a seamless, dependable protection solution.

Compatibility note: This unit is part of the Square D product family, specifically engineered to work with three-phase distribution environments and Square D panels. If your system uses a 3-phase 600 V distribution, the HDA36125SL offers a direct, reliable protection option with straightforward integration into your current electrical infrastructure.