Square D HJA36070UO 70A 3-Pole 600 V Circuit Breaker

Meet the Square D HJA36070UO 70A 3-Pole 600 V Circuit Breaker—a rugged, reliable safeguard for your three-phase electrical systems. Designed to handle demanding industrial and commercial loads, this breaker provides clear, consistent overcurrent protection where it matters most.

Key specifications at a glance:

• Current rating: 70 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HJA36070UO
• Brand: Square D

Why the 3-pole design matters: with three-pole protection, all phases disconnect together during a fault. This reduces arc flash risk and protects motors and equipment from unbalanced loads, helping extend the life of drive systems, pumps, conveyors, and HVAC equipment.

Ideal use cases:

• Protection for three-phase feeders in commercial, industrial, and manufacturing environments
• Motor and equipment protection for machinery, pumps, and HVAC drives
• Replacement or upgrade in Square D-compatible panels that require a 70 A, 3-Pole, 600 V breaker

What makes it stand out: this circuit breaker is built for reliable performance in standard Square D installations and handles distribution needs up to 600 V. It supports consistent trip characteristics across loads, supporting safer, more predictable operation of your electrical system.

Practical considerations and best practices:

• Confirm your panel and bus configuration accept a 3-pole 70 A device with a 600 V rating.
• Use as part of a balanced protection strategy to safeguard motors, drives, and feeders from overloads and short circuits.
• Handle replacement breakers with care and store in their protective packaging until installation.