Square D HDA36070UJ 70A 3-Pole 600 V Circuit Breaker

Meet the Square D HDA36070UJ 70 A 3-Pole 600 V Circuit Breaker—a rugged, reliable overcurrent protector designed for demanding three‑phase electrical systems. With a 70‑amp rating and a maximum voltage of 600 volts, this breaker prevents damage to motors, drives, and other heavy loads while keeping your panel organized and code‑compliant.

What it is and how it works

This 3‑pole circuit breaker from Square D is built to interrupt current across all three hot conductors in three‑phase systems, ensuring balanced protection and trip coordination. The HDA36070UJ is purposefully designed for installations where up to 70 A of load current must be safeguarded in environments that operate at voltages up to 600 V.

Key specifications

• Current rating: 70 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HDA36070UJ
• Brand and family: Square D, HDA series

Ideal use cases

• Protection for three‑phase motors, conveyors, pumps, and machine drives up to 70 A
• Three‑phase feeders in commercial or light industrial panels that operate at voltages up to 600 V
• Replacement or upgrade for aging or incompatible breakers in Square D panels designed for HDA‑series devices

Why this model stands out

Unlike generic single‑pole or smaller multi‑pole breakers, the HDA36070UJ provides dedicated three‑phase protection with a precise 70‑amp rating. This specificity helps you achieve better protection coordination with upstream devices and downstream equipment, reducing nuisance trips and improving reliability in demanding environments. The 600 V rating covers a broad range of industrial and commercial applications, giving you versatility without sacrificing safety margins.

Practical considerations and setup tips

• Ensure your panel accepts HDA‑series breakers to guarantee proper fit and electrical characteristics.
• Use this breaker to protect three‑phase equipment that requires balanced, cross‑phase protection across all three hot conductors.
• When planning upgrades or replacements, confirm that your downstream equipment and wiring sized for 70 A are compatible with a three‑pole arrangement.
• Refer to your panel’s documentation for installation torque and terminal guidelines to ensure secure, code‑compliant connections.

With the Square D HDA36070UJ, you’re choosing a purpose‑built solution for safeguarding three‑phase circuits in industrial and commercial settings. It delivers targeted protection, straightforward replacement in compatible panels, and the reliability you expect from a trusted Square D component. If your project involves three‑phase loads up to 70 A and up to 600 V, this breaker is a precise, dependable choice.