Square D HDA36090UKYP 90A 3-Pole 600 V Circuit Breaker Potential Transformer

The Square D HDA36090UKYP is a rugged 90 A, 3-pole circuit breaker engineered for reliable protection in demanding 600 V three-phase electrical systems. Built to integrate seamlessly into industrial control panels and power distribution setups, this unit combines solid protection with practical versatility for real-world applications.

Designed for true three-phase protection, the HDA36090UKYP ensures coordinated disconnection across all phases during overloads or fault conditions. This helps minimize equipment damage, reduce downtime, and improve overall system safety in environments where every second counts.

• Current rating: 90 A
• Poles: 3 (three-phase protection)
• Voltage rating: up to 600 V
• Part number: HDA36090UKYP
• Potential transformer compatibility: supports integration with PT-based monitoring and protection schemes for extended protection and metering capabilities

Ideal for a range of settings, this breaker is a solid choice for:

• Main distribution in manufacturing lines, machine centers, and process control panels
• Motor control centers and complex load distributions requiring balanced phase protection
• Data center and industrial facilities where stable 3-phase protection under higher voltage is critical

What makes this Square D unit stand out is its combination of precise, reliable tripping behavior and its compatibility with protection strategies that use potential transformers. In practice, you’ll experience tighter control over fault currents, improved fault isolation, and smoother panel operation compared with single- or dual-pole solutions—especially in systems where three-phase balance is essential for performance and safety.

Practical notes for use:

• Verify panel compatibility with HDA-series breakers and ensure correct mounting and latching within the distribution board.
• Match the current rating (90 A) to the connected load to prevent nuisance tripping while preserving protection margins.
• For protection schemes that rely on potential transformers, plan PT connections in accordance with your relay or metering configuration to enable accurate monitoring and trip signaling.
• Follow all relevant electrical codes and manufacturer guidelines during installation and servicing.

With the Square D HDA36090UKYP, you’re choosing a dependable, three-phase safeguard for midsize to large electrical infrastructures—delivering targeted protection where it’s needed most and helping you keep critical operations online.