Square D HDA36125SN 125A 3-Pole 600 V Circuit Breaker

The Square D HDA36125SN 125A 3-Pole 600V Circuit Breaker is a dependable guardian for your three-phase electrical distribution. Built to withstand demanding industrial environments, this breaker delivers precise overcurrent protection to keep motors, feeders, and panels safe from overloads and short circuits.

Key specifications

• Part Number: HDA36125SN
• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V

Why the HDA36125SN stands out

• Precise three-pole protection: Specifically designed for three-phase power, it safeguards all three phases in your distribution system, helping prevent unbalanced loads and equipment damage.
• Industrial-grade reliability: Part of Square D’s trusted lineup, engineered for consistent performance in commercial and light industrial settings.
• High-voltage capability: rated up to 600 V to accommodate a wide range of industrial applications while providing dependable interruption protection when faults occur.
• Clear compatibility path: Ideal for Square D panels and enclosures that accept HDA-series breakers, making replacement and upgrades straightforward.

Ideal use cases

• Protect three-phase feeders and motors in manufacturing floors, processing plants, and assembly lines.
• Upgrade or replace aging protection in distribution panels within commercial facilities, data centers, or large commercial kitchens.
• Install in motor control centers and switchgear where reliable overload and short-circuit protection at up to 125A is required.

Practical considerations for installation and ongoing use

• Ensure the panel or switchgear is listed for HDA-series breakers and supports a 3-pole, 125A device rated at 600V.
• Consult the panel’s labeling for permitted interrupting capacity and conductor sizing; follow all local electrical codes during installation.
• Torque and termination requirements should align with the panel manufacturer’s specifications — verify and tighten to the indicated values to maintain reliable performance.

Choosing the Square D HDA36125SN means opting for a proven protection solution that helps you minimize downtime, protect expensive equipment, and maintain safe, reliable power distribution across your facility. Whether you’re equipping a new panel, performing a retrofit, or stocking spare breakers for maintenance, this 125A, 3-pole, 600V unit offers clear, practical benefits for demanding electrical systems.