Square D HDA36070SN 70A 3-Pole 600 V Circuit Breaker

Engineered for demanding electrical systems, the Square D HDA36070SN delivers dependable protection for three-phase power with a 70 A rating and a 600 V maximum. This 3-pole circuit breaker is built to safeguard motors, feeders, and distribution panels from overloads and short circuits, helping you keep critical equipment running smoothly while maintaining safe, organized panels.

Key specifications

• Current rating: 70 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HDA36070SN

Why this breaker stands out

• The 3-pole design ensures coordinated interruption across all phases, reducing the risk of phase imbalance and protecting multi-motor and multi-feed circuits.
• Robust, industrial-grade build: Designed for reliability in commercial and industrial panels where consistent protection matters most.
• Clear, role-specific protection: With a 70 A rating and a 600 V limit, it’s well-suited for moderate-to-heavy loads common in HVAC, manufacturing lines, and distribution feeders.
• Seamless panel integration: Engineered to work with Square D enclosures and compatible systems, helping you maintain a neat, unified electrical installation.

Ideal use cases

• Protecting three-phase motors, pumps, and conveyors in manufacturing or processing facilities.
• Feeding three-phase distribution panels in commercial buildings and industrial spaces.
• Safeguarding HVAC equipment and large fans that rely on three-phase power.
• Replacing worn or under-rated breakers in systems that require higher voltage protection and multi-pole coordination.

How it helps you solve real-world problems

• Prevent unbalanced loads: Coordinated tripping across all three phases minimizes fault conditions and protects connected equipment from partial trips.
• Improve maintenance planning: A clearly rated 70 A, 3-pole unit provides predictable behavior, making fault diagnostics faster and safer.
• Simplify stocking and replacements: The specific part number HDA36070SN aligns with Square D inventories, reducing the guesswork when ordering replacements for legacy systems.

Installation and practical tips

• Verify that your panel or enclosure supports a 3-pole, 600 V class device in the HDA series and that mounting aligns with the unit’s terminal layout.
• Ensure proper torque on terminals according to the panel manufacturer’s guidelines to maintain secure connections and reliable tripping behavior.
• Before commissioning, confirm that the connected loads are within the 70 A rating to avoid nuisance trips while still providing robust protection.
• Keep the circuit breaker accessible for periodic inspection and testing, and label it clearly to reflect its role in protecting three-phase circuits.

The Square D HDA36070SN 70A 3-Pole 600 V Circuit Breaker is a purpose-built solution for reliable three-phase protection in industrial and commercial environments. By combining precise trip performance with a durable design, it helps protect both equipment and personnel while supporting efficient electrical system operation.