Square D HJL36100U44XAABCSD 100A 3-Pole 600 V Circuit Breaker

Introducing the Square D HJL36100U44XAABCSD — a 100 A, 3-pole, 600 V circuit breaker designed for reliable protection of three-phase power systems. This part-numbered device is built to intercept fault currents and safeguard wiring and connected equipment in commercial and industrial environments.

Key specs at a glance

• Part Number: HJL36100U44XAABCSD
• Current rating: 100 A
• Poles: 3
• Voltage rating: 600 V

Why a 3-pole breaker matters

A 3-pole protection ensures all three phases are disconnected together during a fault, preventing phase imbalance and reducing the risk of equipment damage. The 600 V rating makes it suitable for higher-voltage distribution common in commercial and light industrial installations, while the 100 A capacity guards feeders and motor circuits from overcurrent without nuisance tripping on normal startup transients.

Practical use cases

• Protect three-phase motors (compressors, conveyors, pumps) in manufacturing or processing facilities.
• Feed large equipment panels where balanced protection across all three phases is essential.
• Upgrade or replace aging protection in existing Square D installations with the same part family for consistent performance.

What to know when selecting this breaker

Match your system’s three-phase voltage and current needs: 100 A protection at 600 V is appropriate for feeders and motor circuits in many commercial settings. When ordering, ensure the Part Number: HJL36100U44XAABCSD aligns with your panel’s acceptable breaker family and mounting style to maintain reliable protection and compliance.