Square D HGA36070UO 70A 3-Pole 600 V Circuit Breaker

Meet the Square D HGA36070UO 70A, 3-pole, 600V circuit breaker—built for dependable, three-phase protection in demanding electrical systems. This unit is designed to interrupt all three live conductors in the event of overload or short circuit, helping you keep critical equipment safe and your panels compliant. With a 70 A current rating and a 600 V maximum system voltage, it’s a reliable choice for industrial applications that demand robust, coordinated protection across three phases.

• Current rating: 70 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HGA36070UO
• Brand/series: Square D HGA family

Why this breaker stands out

The HGA36070UO is purpose-built for 3-pole, 3-phase circuits, delivering coordinated disconnection that enhances safety and system stability in commercial and industrial panels. Its design aligns with Square D standards for reliability and consistent performance under load, ensuring reliable overcurrent protection for feeders, motors, and distribution circuits. The 70A rating pairs with a sturdy construction to handle routine startup surges and fault events without nuisance tripping in properly sized installations.

Ideal use cases

• Three-phase motor control circuits for conveyors, pumps, and fans in manufacturing facilities
• Branch protection for industrial panels serving HVAC, compressors, or processing equipment
• Main or sub-feed protection in commercial or light industrial electrical distributions

How it helps your electrical system

• Comprehensive three-phase protection: disconnects all phases simultaneously to prevent phase-to-ground or phase-to-phase faults from propagating
• Durable protection for 600V systems: designed to withstand the demands of higher voltage distribution environments
• Streamlined compatibility: part of the Square D HGA series, offering predictable fitment within compatible panels and bus configurations
• Clear identification and traceability: straightforward part number reference (HGA36070UO) for maintenance records and replacements

Practical tips for installation and operation

• Ensure the panel and conductors are rated for 600V and that the 70A rating matches the load requirements of the protected circuit
• Verify proper three-phase mounting and secure mounting hardware to maintain reliable mechanical and electrical contact
• Coordinate protection with upstream devices to minimize nuisance trips and protect sensitive equipment during fault events
• Consult your panel manufacturer’s guidelines to confirm compatibility with the HGA series and any required accessories or mounting options