Square D HDA36150UD 150A 3-Pole 600 V Circuit Breaker

Engineered for robust protection of 3‑phase power systems, the Square D HDA36150UD 150A 3-Pole 600 V Circuit Breaker delivers reliable overcurrent protection for feeders and motors up to 150 amps. Designed to handle demanding commercial and industrial environments, this unit helps safeguard equipment, minimize downtime, and keep critical systems running smoothly.

Key specifications at a glance

• Part Number: HDA36150UD
• Current rating: 150 A
• Poles: 3
• Voltage rating: 600 V

What makes this breaker unique

• Three-pole protection for 3-phase systems: Precisely suited for three-phase feeders and motor circuits, ensuring balanced protection across all phases.
• Dedicated Square D design: Part of the HDA series, this breaker is built to integrate seamlessly with Square D distribution panels and control gear, offering predictable trip characteristics and reliable performance.
• Clear procurement and maintenance benefits: With a defined part number (HDA36150UD) and rating, it simplifies inventory management and fast replacement during maintenance cycles.
• Durable construction for industrial use: Engineered to withstand the demands of commercial environments, reducing the risk of nuisance trips and providing stable protection for critical loads.
• Maximize system protection without oversizing: The 150 A rating hits a practical middle ground for moderate to high-demand feeders, preventing overloads while supporting efficient energy use.

Ideal use cases

• Protecting three‑phase feeders in data centers, manufacturing floors, and large equipment rooms where motors and drives are common.
• Replacement or upgrade in facilities that rely on Square D panels and HDA-type protection devices for consistent performance.
• Electrical distribution in commercial buildings with distributed power for HVAC, compressors, or heavy-duty equipment.

How it fits into your installation and workflow

The HDA36150UD is designed for installations that require dependable 3‑phase protection at a 600 V maximum system voltage. When selecting this breaker, ensure the application calls for a 150 A rating in a 3‑pole configuration and that the panel or enclosure is compatible with Square D HDA devices. Keep a spare HDA36150UD on hand as part of routine maintenance to minimize downtime during service or replacement.

Practical tips for best results

• Verify that your system operates within the 600 V maximum voltage rating and that the load is appropriate for 150 A protection to avoid nuisance trips.
• Use in applications with balanced three‑phase loads to maintain stable protection across all phases.
• Document the part number (HDA36150UD) and current rating in your maintenance logs for quick reference during panel servicing or upgrades.