Square D HDA36090SK 90A 3-Pole 600 V Circuit Breaker

The Square D HDA36090SK 90A 3-Pole 600V Circuit Breaker is engineered for dependable, three‑phase protection in demanding industrial and commercial panels. Built to handle real-world load profiles, this device helps safeguard wiring, motors, and downstream equipment from overloads and faults—keeping downtime to a minimum and your system running smoothly.

• Part number: HDA36090SK
• Current rating: 90 A
• Poles: 3
• Voltage rating: 600 V

Key advantages of the HDA36090SK include its three‑pole design, which ensures simultaneous disconnection of all conductors in a three‑phase circuit. This improves safety, simplifies maintenance, and helps meet electrical code requirements for coordinated protection in larger power distribution setups. With a 600 V rating, it’s versatile enough for a wide range of commercial and industrial applications where three‑phase power is standard.

Ideal use cases

• Protection for three‑phase motors, pumps, conveyors, and machinery in manufacturing facilities
• Panelboard distribution in commercial or light industrial settings that run on up to 600 V
• Main or feeder protection in electrical enclosures where reliable interruption is critical to uptime

Practical benefits that set this model apart:

• Reliable overload and short‑circuit protection tailored for 90‑amp circuits, helping prevent equipment damage
• Compatibility with Square D panels and system architectures designed for 3‑pole, 600 V protection
• Clear, straightforward troubleshooting and maintenance due to standardization within the Square D family

Installation and maintenance tips (practical, no‑nonsense guidance): ensure your panel rating matches the 600 V, 3‑pole configuration; perform proper torque on terminals per local codes; and replace only with the same or equivalent Square D part to preserve protection coordination and warranty. For best results, have a qualified electrician assess your three‑phase load Profile and confirm that 90 A is the appropriate protection setting for the circuit served.

Whether you’re upgrading an aging panel, consolidating protection for multiple feeders, or planning a new 3‑phase installation, the Square D HDA36090SK delivers confident, consistent performance. It’s a purpose‑built choice for reliable three‑phase protection at up to 600 volts, offering a precise 90‑amp safety net where it matters most.