Square D HJA36100U44XAA 100A 3-Pole 600 V Circuit Breaker

Meet the Square D HJA36100U44XAA 100A 3-Pole 600 V Circuit Breaker — a trusted choice for safeguarding three-phase power distribution in demanding commercial and industrial environments. Designed to intercept fault currents swiftly, this unit helps protect wiring, panels, and connected equipment from overloads and short circuits, keeping downtime to a minimum and safety top of mind.

Key specifications

• Part Number: HJA36100U44XAA
• Current rating: 100 A
• Poles: 3 (three-pole design for 3-phase systems)
• Voltage rating: 600 V
• Brand: Square D (Schneider Electric)

Why this 3-pole, 600V breaker matters

• Three-pole protection aligns with 3-phase electrical systems common in warehouses, manufacturing floors, and data centers, ensuring balanced protection across all phases.
• 600 V rating expands its suitability to higher-voltage distributions often found in commercial facilities, providing robust protection for feeders and panelboards.
• 100 A current rating makes it ideal for protecting sizable circuit branches without nuisance tripping, supporting reliable operation of motors, transformers, drives, and other heavy loads.

Ideal use scenarios

• New installations in commercial buildings with 3-phase distribution needing solid overcurrent protection at 600 V.
• Replacement in existing Square D panel systems where a 100 A, 3-pole device is specified.
• Industrial environments with motors, conveyors, or processing equipment that require dependable branch protection.

What sets it apart

• Designed to integrate seamlessly with Square D panelboards and distribution setups, offering reliable coordination with other protection devices in the same family.
• Part-number precision ensures you’re selecting an exact match for repairs or upgrades, reducing compatibility questions in the field.

Practical installation and maintenance tips

• Verify that your panel is configured for 3-pole, 600 V devices and that this unit is listed for the intended installation environment.
• Follow standard safety practices when handling live electrical components; use insulated tools and PPE as required.
• Record the replacement part number (HJA36100U44XAA) for future maintenance logs to simplify ordering and audits.