Square D HJA36100U44XAABCSHYP 100A 3-Pole 600 V Circuit Breaker Potential Transformer

Meet the Square D HJA36100U44XAABCSHYP—a purpose-built 100 A, 3-pole circuit breaker designed for reliable protection in three-phase electrical systems. With a 600 V maximum rating, this unit is engineered to safely interrupt fault currents in demanding commercial and industrial environments, while fitting neatly into Square D distribution panels that accept this part number.

Key specifications

• Current rating: 100 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HJA36100U44XAABCSHYP

Why this breaker stands out

• Three-pole protection for balanced, three-phase systems: The 3-pole design ensures synchronized interruption across all phases, helping to prevent neutral and phase imbalances that can stress downstream equipment.
• Robust, trusted Square D build: This part carries Square D’s reputation for dependable protection in critical electrical infrastructure, backed by precise manufacturing and component traceability.
• Clear compatibility for mid-size distribution: With a 100 A rating and 600 V capability, it’s well-suited for feeders, main distribution lines, and key circuit protections in commercial and light industrial settings.

Ideal use cases

• Three-phase feeders in commercial buildings and retailers with demanding loads.
• Industrial panels serving motors, conveyors, pumps, and other heavy equipment where reliable fault isolation is essential.
• Maintenance-ready spare part for service fleets to minimize downtime during panel servicing.
• Backup protection in data centers or critical facilities that rely on steady power distribution and quick fault clearance.

Installation and compatibility

Designed to integrate with Square D distribution systems, this 3-pole breaker is best paired with panels and bus configurations that specify compatibility with HJA36100U44XAABCSHYP. When installing, verify that your panel labeling supports the rated current, voltage, and three-phase configuration, and follow standard safety practices for disconnecting power before service. Proper seating and secure terminal connections are essential to long-term reliability.

Practical tips and insights

• Use this unit as a dedicated protection point for high-demand three-phase circuits to ensure rapid isolation on fault events, protecting both personnel and equipment.
• Pair it with routine panel maintenance workflows to keep protection pathways clear and ensure quick replacement if a fault trip occurs.
• Document the exact part number (HJA36100U44XAABCSHYP) in your asset management system to simplify future replacements and panel audits.

Whether you’re refurbishing an aging distribution panel or stocking parts for ongoing maintenance, the Square D HJA36100U44XAABCSHYP delivers dependable, three-phase protection with a precise fit for compatible Square D installations. This is a practical, long-lasting choice for safeguarding 100 A circuits in demanding 600 V environments.