Square D HJA36150U31XAA 150A 3-Pole 600 V Circuit Breaker Potential Transformer

The Square D HJA36150U31XAA is a purpose-built 150 A, three-pole circuit breaker designed for demanding industrial power distributions. Engineered to support protective relays and metering through potential transformer (PT) configurations, this device blends reliable overcurrent protection with measurement-ready versatility in a single, rugged package.

Key Features

• Current rating: 150 A, delivering strong protection for moderate-to-high load centers
• Poles: 3 for balanced three‑phase protection in commercial and industrial systems
• Voltage rating: up to 600 V, suitable for typical industrial power distribution environments
• Potential transformer compatibility: designed to integrate with PT-based protection and remote metering schemes
• Precise part identification: Part Number HJA36150U31XAA ensures exact replacement and compatibility
• Robust construction: built to withstand the rigors of demanding electrical installations

Why this Breaker Stands Out

Unlike generic breakers, this Square D model is purpose-tuned for environments where monitoring and protection must work hand-in-hand. The 3-pole configuration delivers coordinated trip protection across all phases, reducing the risk of unbalanced faults. Its PT-ready design means you can pair it with metering and protection schemes without needing additional adapters, simplifying installation and improving visibility into real-time electrical conditions.

Ideal Use Cases

• Industrial facilities with three-phase equipment and heavy motors
• Data centers and server rooms where reliable protection and accurate power monitoring are critical
• Manufacturing floors with complex distribution panels requiring PT-enabled protection
• Commercial buildings employing three-phase distribution in main service panels
• OEM panel assemblies needing a precise, compatible Square D component

Specifications at a Glance

• Current rating: 150 A
• Poles: 3
• Voltage rating: 600 V
• Part Number: HJA36150U31XAA
• Function: Circuit breaker with potential transformer support for enhanced protection and measurement

Practical Tips for Installation and Use

• Verify panel compatibility and fitment with your Square D enclosure and labeling to ensure proper mounting and electrical clearances
• Plan for PT integration by identifying the appropriate metering or protection relays in your system design
• Torque connectors to the manufacturer's specifications and perform a final inspection after installation
• Keep a record of the part number (HJA36150U31XAA) for future replacements or maintenance planning