Square D HJA36150UOYP 150A 3-Pole 600 V Circuit Breaker

Meet the Square D HJA36150UOYP 150A 3-Pole 600 V Circuit Breaker—an essential safeguard for three-phase electrical systems. With a 150-amp current rating delivered across three poles and a 600-volt maximum rating, this breaker is engineered to protect demanding commercial and industrial circuits while simplifying panel layouts.

What it does for you is straightforward: it interrupts power when an overload or fault occurs, shielding wiring and equipment from damage and helping prevent fires. The three-pole design means you can efficiently protect all three phases in a 3‑phase distribution, reducing the need for multiple singles and simplifying maintenance and replacements in larger service panels.

Key considerations and benefits

Exact compatibility—part number HJA36150UOYP ensures you’re selecting the precise Square D replacement for compatible panels and feeders, reducing installation uncertainties and downtime.

Three-phase protection—the 3-pole configuration is ideal for balanced, industrial power distribution, motor drives, and other 3‑phase loads where unified protection and coordinated tripping are important.

High voltage readiness—rated for up to 600 V, it accommodates a wide range of commercial and industrial applications while maintaining safe interruption performance under fault conditions.

Ideal use cases

• Three-phase motor circuits and feeders in manufacturing facilities

• Distribution panels in warehouses, data centers, and large commercial spaces

• Upgrade or replacement in existing Square D installations to maintain consistent protection across the system

Why choose this Square D breaker

Compared to smaller or single-pole devices, this 150A 3-pole breaker provides coordinated protection across all phases, helping ensure simultaneous isolation during faults and simplifying panel wiring. Its construction aligns with Square D’s reliability standards, offering robust performance in everyday operating conditions and during surge events.

Practical tips for installation and use

Verify that your panel or distribution setup supports a 3-pole, 150 A device and that the bus configuration is compatible with Square D HJA36150UOYP. Ensure correct torque on mounting fuses and terminations per manufacturer guidance, and always de-energize the system before replacement to maintain safe, effective protection. Keep the part number handy for future maintenance or ordering to guarantee you’re referencing the exact specifications required by your electrical system.