Square D HJA36125UA 125A 3-Pole 600 V Circuit Breaker

Protect critical three-phase loads with a trusted name—Square D HJA36125UA. This 125 A, 3-pole, 600 V circuit breaker is designed for distribution panels in commercial and industrial settings, delivering reliable protection across all phases of a 600 V system. Its three-pole design ensures balanced interruption on each leg, reducing the risk of unbalanced faults and equipment damage.

Specifications

• Part Number: HJA36125UA
• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V

Why choose the Square D HJA36125UA

Unlike smaller single-pole devices, this three-pole breaker provides coordinated protection for three-phase circuits, which is essential for motors, compressors, and other balanced loads. The 125 A rating offers robust protection for mid-size equipment while enabling clean disconnection during a fault. Being part of the Square D family, it benefits from durable construction and compatibility with standard enclosures used in modern electrical distributions.

Ideal use cases

• 3-phase power distribution in industrial facilities and large commercial spaces
• Main or feeder protection for equipment drawing up to 125 A per leg in 600 V circuits
• Motor and drive protection where balanced trip across all phases is essential

Installation & compatibility tips

• Verify that your panel or enclosure supports 3-pole, 600 V circuit breakers and that the mounting style matches your equipment
• Ensure conductors are correctly sized for 125 A protection and that torque requirements follow manufacturer guidelines
• Schedule periodic inspections to confirm there are no signs of overheating, arcing, or wear on terminals

Care and safety

Use proper protective equipment and follow lockout/tagout procedures when servicing. Replace a breaker if it shows signs of wear, has tripped due to a fault that cannot be reset, or if the enclosure indicates overheating around the device.

Upgrade your 3-phase protection with the Square D HJA36125UA 125A 3-Pole 600 V Circuit Breaker and enjoy reliable performance in demanding electrical environments.