Square D HDA36100UNYP 100A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36100UNYP 100 A 3-Pole 600 V Circuit Breaker—a purpose-built protection device designed for demanding 3‑phase electrical systems. With a 100 A rating and three poles, this breaker delivers dependable overcurrent protection for distribution panels and feeders up to 600 V, helping to safeguard motors, drives, and downstream equipment from damaging faults.

Part Number HDA36100UNYP anchors a trusted Square D solution that installers rely on for consistent performance in real-world environments. Crafted with rugged molded‑case construction and a clear, easy-to-read status indicator, this breaker balances durability with straightforward replacement in compatible panels and enclosures. Its thermomagnetic trip mechanism provides fast, precise interruption during overloads and short circuits, minimizing downtime and protecting valuable assets.

Key specifications at a glance

• Current rating: 100 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HDA36100UNYP
• Brand: Square D

Why this 3-pole design matters

In 3‑phase systems, a balanced, three‑pole breaker ensures synchronized protection across all phases, reducing the risk of uneven faults that can damage motors and other equipment. The 600 V rating expands its applicability to higher‑voltage distribution scenarios, while the 100 A capacity suits mid‑sized panels and industrial feeders without compromising protection.

Ideal use cases

• Protect 3‑phase motors, pumps, and drives in manufacturing floors or processing lines
• Serve as a main disconnect or feeder protection in mid‑sized electrical panels and switchgear
• Replace compatible Square D breakers in existing installations for reliable, brand‑matched performance
• Use in data centers, commercial facilities, and light industrial environments where dependable fault interruption is essential

What sets the HDA36100UNYP apart

• Authentic Square D design engineered for predictable trip curves and long‑term reliability
• Three‑pole configuration provides coordinated protection across all phases
• 600 V rating supports higher‑voltage distribution while safeguarding conductors and equipment
• Durable molded‑case construction stands up to demanding installation environments

Installation and practical guidance

• Ensure compatibility with your panel or enclosure and confirm the voltage and current ratings align with system requirements
• Follow manufacturer torque specifications for terminal connections to maintain secure, reliable contact
• Verify the handle position after installation and after any fault condition to confirm proper ON/OFF status
• Replace only with the same rated device (100 A, 3-pole, 600 V) to preserve electrical protection integrity

Tips for maximizing value and reliability

• Pair this breaker with upstream protection devices to create a coordinated protection scheme
• Schedule periodic visual checks for signs of wear, arcing, or loose connections, performed by a qualified electrician
• Maintain documentation with the exact part number (HDA36100UNYP) for future replacements and panel compatibility

With the Square D HDA36100UNYP 100 A 3-Pole 600 V Circuit Breaker, you gain a dependable, brand‑matched solution that protects your 3‑phase electrical system while simplifying installation, maintenance, and future panel upgrades.