Square D HDL36100U43X - 100 A, 3-Pole Circuit Breaker | AmpState

The Square D HDL36100U43X delivers reliable, space-efficient protection for your electrical panel with a clean, three-pole design tuned for 3-phase systems. At 100 A, this molded case circuit breaker provides disciplined branch circuit overcurrent and short-circuit protection in panelboards and load centers, helping you prevent damage and downtime in demanding environments.

• Compact molded case design makes efficient use of panel space, so you can fit essential protection without crowding the enclosure.
• Thermal-magnetic trip unit delivers stable, repeatable protection characteristics, responding predictably to both overloads and short circuits.
• 3-pole configuration designed for 3-phase circuits, ideal for commercial or light industrial applications as part of a balanced protection strategy.
• OEM compatibility engineered to work with matching Square D load centers and panelboards, ensuring proper fit, alignment, and coordinated protection.
• Versatile for multiple applications suitable for residential, commercial, and light industrial electrical protection needs where dependable overcurrent protection is a must.

Smart protection for real-world needs

This 100 A, 3-pole breakers cleanly isolate fault conditions, reducing the risk of wiring damage, equipment failure, and nuisance outages. By combining a compact form factor with a reliable thermal-magnetic trip mechanism, the HDL36100U43X helps you maintain service continuity for lights, motors, HVAC loads, and other critical circuits in panelboards and load centers.

Use cases and ideal applications

• New installations that require a compact, three-pole protective device for 3-phase electrical systems
• Panelboard or load center upgrades where OEM compatibility matters for seamless operation
• Residential lighting and small commercial circuits that benefit from dependable branch-circuit protection
• Light industrial feeders that demand consistent trip performance under varying load conditions

Technical specifications

• Manufacturer: Square D
• Part number: HDL36100U43X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 100 A
• Number of poles: 3
• Application: Branch circuit overcurrent and short-circuit protection
• Compatibility: Designed to match OEM load centers and panelboards for coordinated protection

Whether you’re building out a new panel installation or upgrading an aging setup, the HDL36100U43X offers precise protection, compact footprint, and OEM-aligned performance. Trust it to safeguard your circuitry with dependable, repeatable trip behavior, and keep your electrical system running smoothly.