Square D HDA36125UNYP 125A 3-Pole 600 V Circuit Breaker

Square D HDA36125UNYP 125A 3-Pole 600 V Circuit Breaker is a reliable protection device designed for demanding 3-phase electrical systems. Built to safeguard feeders and equipment, this breaker clearly communicates its ratings and role in keeping power distribution safe and uninterrupted.

Key specifications

• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HDA36125UNYP
• Brand: Square D

What makes this model stand out

• Three-pole design provides protection across a three-phase circuit with a single, coordinated trip, helping prevent damage from uneven phase loading.
• 125 A rating makes it well-suited for mid-range feeders and equipment, offering robust protection without unnecessary trip-cycling in demanding environments.
• 600 V maximum voltage rating accommodates a wide range of industrial and commercial applications, from motor feeders to distribution panels.
• Part of the Square D family, ensuring compatibility with standard Square D panels and field service practices for easier replacement and maintenance.

Ideal use cases

• Three-phase distribution panels in manufacturing and processing facilities
• Motor control centers and large equipment feeders that require reliable overcurrent protection
• Commercial HVAC and processing systems where stable, safe power protection is critical
• Upgrade or replacement for aging electrical protection in systems that operate at or near 125 A and 600 V

Installation and compatibility tips

Use the Square D HDA36125UNYP within panels and distribution systems designed for 3-pole, 600 V breakers. Verify that the surrounding equipment and bus assemblies match the breaker’s three-pole format and amperage rating. Always follow local electrical codes and the manufacturer’s installation instructions to ensure correct mounting, alignment, and secure connections for reliable, long-term protection.

For projects requiring dependable 3-phase protection at 125 amperes and up to 600 volts, the Square D HDA36125UNYP 125A 3-Pole 600 V Circuit Breaker delivers clear performance, straightforward replacement, and compatibility with existing Square D infrastructure.