Square D HJL36100U44XAA 100A 3-Pole 600 V Circuit Breaker

The Square D HJL36100U44XAA is a purpose-built protection device for three-phase power systems, delivering 100 A of current protection across three poles in configurations up to 600 V. Designed for reliability in demanding commercial and light industrial environments, this circuit breaker helps safeguard wiring and equipment from overloads and fault conditions, so downtime and damage are minimized.

Why this breaker stands out

• Three-pole protection — ideal for balanced three-phase systems, ensuring synchronized interruption on all legs when a fault is detected.
• 100 A rating — precise current limiting to protect feeders, motors, and connected devices without unnecessary trips.
• 600 V maximum rating — suitable for higher-voltage distribution in commercial and some industrial applications, expanding your protection options.
• Solid, durable build — engineered to perform consistently in panel boards and electrical rooms where reliability matters most.
• Clear identification — part number HJL36100U44XAA provides exact compatibility within Square D installations and inventory management.

Ideal use cases

• Three-phase distribution panels in data centers, office complexes, and warehouse facilities needing dependable branch protection.
• Motor control circuits and HVAC equipment where a robust 600 V protection strategy is essential.
• Panel replacements or upgrades within Square D ecosystems, ensuring the new breaker matches existing configurations.

Installation and compatibility tips

• Verify that the panel or enclosure is compatible with Square D HJL-series breakers and supports three-pole, 100 A devices.
• Ensure correct mounting orientation and secure bus connections to maintain reliable trip performance.
• Use only with conductors and wiring practices rated for up to 600 V and the associated amperage.
• Consult your electrical diagrams or a qualified electrician to confirm the exact fitment and protection requirements for your installation.

Technical snapshot

• Brand: Square D
• Model / Part number: HJL36100U44XAA
• Current rating: 100 A
• Poles: 3
• Voltage rating: 600 V