Square D HJA36150SP 150A 3-Pole 600 V Circuit Breaker

Square D HJA36150SP 150A 3-Pole 600 V Circuit Breaker is a rugged, reliable protection device designed for three-phase electrical systems in demanding commercial and industrial environments. With a 150 A rating and a 600 V maximum, it provides fast, coordinated interruption to guard wiring, motors, and equipment from overloads and short circuits, helping to minimize downtime and electrical damage.

Key specifications at a glance:

• Part Number: HJA36150SP
• Current rating: 150 A
• Poles: 3
• Voltage rating: 600 V
• Configuration: 3-pole circuit protection for 3-phase systems
• Brand: Square D

Why this matters for your system

In a three-phase distribution network, a 3-pole breaker like the HJA36150SP ensures all live conductors are simultaneously protected, maintaining balanced protection across phases and providing a predictable fault response. The 600 V rating makes it suitable for higher-voltage feeders often found in industrial facilities, manufacturing lines, and large commercial installations. Choosing the exact OEM part helps preserve panel coordination, trip curves, and replacement compatibility, reducing the risk of misfits or non‑conforming substitutes.

Ideal use cases

• Protection for 3-phase feeders in industrial control panels and service entrances
• Motor feeder protection for pumps, compressors, conveyors, and HVAC equipment
• Panel upgrades and replacements that require an exact Square D specification
• Maintenance intervals where consistent OEM parts support reliable uptime

Installation and practical considerations

• Verify that your panel or enclosure supports a 3-pole, 600 V-rated device and that the mounting style matches your current setup
• Ensure the downstream conductors and upstream protection are coordinated with the breaker’s trip characteristics
• Follow the manufacturer’s torque specifications and safety procedures during replacement or installation
• Label circuits clearly to reflect the new protective device and maintain clear maintenance records

What you get

• One Square D HJA36150SP 150A 3-Pole 600 V Circuit Breaker
• Designed for compatibility with Square D panels and compatible enclosures (confirm your panel model for exact fit)