Square D HJA36100U44XAABCSD 100A 3-Pole 600 V Circuit Breaker

Meet the Square D HJA36100U44XAABCSD, a purpose-built circuit breaker engineered for reliable protection in three-phase, high-voltage systems. With a 100 A current rating and a 3-pole construction, this unit is designed to safeguard your most critical power feeds up to 600 V.

Key benefits that matter in real-world installations

• Exact fit for Square D panels — Part number alignment (HJA36100U44XAABCSD) ensures straightforward replacement and consistent trip characteristics within compatible Square D distribution panels.
• Three-phase protection — The 3-pole design protects each hot leg, maintaining balance across your three-phase circuits and reducing the risk of partial failures that can damage equipment.
• 600 V voltage rating — Suitable for industrial and commercial environments where higher voltage distribution is used, providing reliable interruption capability up to 600 V.
• 100 A current rating — Handles substantial load centers and motor feeders without frequent nuisance trips, while still delivering fast, predictable disconnection when faults occur.
• Durable, trusted construction — Square D products are known for durable mechanisms and consistent performance under demanding conditions, helping minimize downtime in busy facilities.

Practical applications

This 100A, 3-pole circuit breaker is well-suited for:

• Three-phase motor feeders in manufacturing and processing equipment
• Dedicated feeders for large HVAC systems and commercial climate controls
• Power distribution blocks in data centers, workshops, and facilities with 600 V class infrastructure

Why choose this model over other options

Choosing the HJA36100U44XAABCSD means leaning on Square D's established reliability and a part-number-accurate solution that integrates smoothly into existing Square D ecosystems. It provides predictable trip behavior, straightforward maintenance, and the assurance of using a component designed for high-demand environments.

Installation and care tips

• Confirm compatibility with your panel's series and mounting requirements before replacing an existing breaker.
• Install only with the system powered down and follow all safety procedures for live electrical work.
• Replace with the same rating (100 A, 3-pole, 600 V) to preserve electrical protection levels and coordination.
• Keep a few spare units on hand for quick replacements to minimize downtime during maintenance cycles.

Part number: HJA36100U44XAABCSD — 100 A, 3-Pole, 600 V Circuit Breaker by Square D. A reliable choice for safeguarding three-phase power in demanding commercial and industrial environments.