Square D HDL36090 - 90 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Square D HDL36090—a 90 A, 600 V, 3-pole molded case circuit breaker engineered to safely shield electrical systems from overloads and short circuits. Designed for dependable branch-circuit protection in panelboards and load centers, it combines a compact footprint with robust performance to fit tight spaces without compromising protection.

Why this breaker stands out

• Space-efficient design: The compact molded case form optimizes panel space, making it easier to organize and expand distribution layouts.
• Stable protection: A thermal-magnetic trip unit delivers repeatable, reliable response across varying temperatures and load conditions, helping prevent nuisance trips while safeguarding circuits.
• OEM-ready compatibility: Specifically compatible with matching OEM load centers and panelboards, simplifying replacement projects and ensuring a proper fit from day one.
• Versatile application: Suitable for residential, commercial, and light industrial electrical distributions, covering a wide range of protection needs.

Technical specs at a glance

• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Ampere Rating: 90 A
• Voltage Rating: 600 V
• Poles: 3
• Manufacturer: Square D
• Part Number: HDL36090
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and practical scenarios

In a residential panel, the HDL36090 provides a dedicated 90 A feeder protection for large circuits or subpanels, ensuring safe distribution to downstream devices. In light commercial environments, it protects essential circuits such as HVAC feeds, lighting corridors, and office equipment, while in small industrial settings it guards distribution lines that operate up to 600 V. Its three-pole design ensures balanced protection across all conductors in three-phase or single-phase configurations used in these environments.

What sets it apart from generic breakers

This Square D MCCB isn’t a generic drop-in replacement. Its compact form factor and thermally magnetic trip mechanism are purpose-built to work within OEM panel systems, providing consistent trip characteristics and reduced chances of incompatibility. If you’re replacing an aging unit or expanding a panel, HDL36090 offers reliable performance aligned with Square D ecosystems.

Installation and safety tips

• Verify panel compatibility: use HDL36090 with panels and load centers designed for this part number or compatible Square D OEM equivalents.
• Confirm electrical ratings: ensure circuits are within 90 A and 600 V for safe operation.
• Label clearly: document the breaker type and rating on your panel schedule to streamline future servicing or replacements.

Maintenance and longevity

With a thermal-magnetic trip unit, the HDL36090 provides dependable protection with minimal maintenance. Regular checks of connections and mounting integrity help preserve performance and prolong service life in everyday electrical environments.