Square D HJL36100U44XAABCSK 100A 3-Pole 600 V Circuit Breaker

Square D HJL36100U44XAABCSK is a rugged, three-pole circuit breaker built for reliable protection in 3‑phase electrical systems. Rated for 100 A and compatible with systems up to 600 V, this unit is designed for demanding commercial and light industrial panels where dependable fault protection matters.

• Current rating: 100 A
• Poles: 3
• Voltage rating: 600 V
• Part/Series: HJL36100U44XAABCSK
• Application: Protects 3‑phase loads such as motors, pumps, and HVAC equipment in panels and disconnects operating up to 600 V

Key advantages of choosing this Square D breaker include exact compatibility with existing Square D installations, ensuring seamless replacement without panel modifications. The three‑pole design provides synchronized protection across all legs of a 3‑phase circuit, reducing the risk of unprotected phases and helping equipment run safely within its rated limits.

Ideal use cases:

• 3‑phase motor circuits up to 100 A in commercial facilities or light industrial environments
• Panelboard or subpanel protection where a single device guards all three phases
• HVAC compressors, pumps, and other 3‑phase equipment in 600 V systems

Practical considerations:

• Match the breaker to the panel’s listed compatible models and to the circuit’s voltage class (up to 600 V)
• Follow manufacturer installation guidelines to ensure proper termination and reliable operation
• Keep the exact part number on hand for future replacements to preserve system reliability