Square D HJA36100U44XAABCSDYP 100A 3-Pole 600 V Circuit Breaker

Meet the Square D HJA36100U44XAABCSDYP 100A 3-Pole 600 V Circuit Breaker—a rugged, reliable overcurrent protection device built for demanding three‑phase electrical systems. This unit carries Part Number HJA36100U44XAABCSDYP and is designed to safeguard distribution panels from overloads and short circuits with precise, coordinated tripping across all phases.

Key specifications at a glance

• Part Number: HJA36100U44XAABCSDYP
• Current rating: 100 A
• Poles: 3
• Voltage rating: 600 V
• Configuration: 3‑pole MCCB for three‑phase protection
• Application: Industrial and commercial electrical distribution

Why this breaker stands out

Designed for three‑phase systems, this 3‑pole breaker provides synchronized disconnection across all phases, reducing the risk of phase-to-phase faults in motor loads, pumps, conveyors, and HVAC equipment. Its 600 V rating broadens its suitability for mid‑voltage distribution within commercial and light industrial environments, giving you a single, reliable device to protect complex electrical circuits. Built by Square D, it combines robust construction with dependable performance to help minimize downtime and equipment damage when overcurrent or short‑circuit events occur.

Ideal uses and applications

• Three‑phase motor circuits in manufacturing lines and production equipment
• Commercial HVAC and pumps where reliable phase protection is critical
• Electrical distribution panels and switchgear deployments in warehouses and facilities
• Panel upgrades or retrofits requiring a 100 A, 3‑pole, 600 V solution

Who should consider this model

Electrical engineers, facility managers, contractors, and OEMs who need a trustworthy, high‑current three‑phase protection device capable of withstanding demanding operating environments and delivering fast, predictable tripping when issues arise.

Practical guidance and best practices

• Ensure compatibility with your panel’s trip characteristics and enclosure footprint before installation.
• Follow proper torque specifications on terminals to maintain reliable connections and minimize heat buildup.
• Label circuits clearly to reflect the three‑phase protection provided by the 3‑pole design.
• Keep a spare unit with the same part number on hand for quick replacement during maintenance or upgrades.