Square D HLA36150SJ 150A 3-Pole 600 V Circuit Breaker

The Square D HLA36150SJ is a rugged, high-capacity circuit breaker designed to protect demanding three-phase electrical systems. With a 150 A current rating, 3-pole configuration, and a 600 V maximum voltage rating, this breaker delivers reliable overcurrent protection for industrial panels, motor circuits, and other heavy-load applications.

Why this design stands out: the three-pole architecture ensures all phases trip together, minimizing the risk of unbalanced faults and reducing equipment damage. Built to perform in challenging environments, the HLA36150SJ provides consistent trip characteristics and dependable protection for critical machinery, HVAC systems, and large distribution panels.

Key specifications at a glance

• Part number: HLA36150SJ
• Current rating: 150 A
• Poles: 3
• Voltage rating: 600 V

Ideal use cases

• Three-phase motor feeders and drive systems
• Large commercial or light industrial panels
• HVAC equipment power distribution and protection
• Heavy-load equipment circuits in data centers, manufacturing rooms, and processing facilities

How this breaker fits into your system

• Designed for use in compatible Square D panel configurations to safeguard three-phase electrical networks
• Part of the proven Square D line, offering predictable protection and service life in routine maintenance cycles
• Easy integration with existing distribution setups that require a 150 A, 3-pole, 600 V solution

Practical notes for installation and maintenance

• Verify panel compatibility and listing before replacement or installation
• Follow standard safety practices when handling energized equipment
• Replace only with the same rating and configuration to preserve system protection and UL/IEC compliance where applicable

For technicians and facilities managers seeking dependable, category-leading protection for three-phase systems, the Square D HLA36150SJ offers a precise balance of high current handling, robust three-pole protection, and a 600 V operating range. It’s a purpose-built choice for safeguarding heavy loads while maintaining service continuity across industrial and commercial installations.