Square D HJA36100U44X - 100 A, 3-Pole Plug-In Circuit Breaker | AmpState

Why this 100A, 3-Pole plug-in breaker stands out

• Fast plug-in connection: Designed for quick installation and simple replacement, reducing downtime during upgrades or maintenance.
• Thermal-magnetic trip unit: Combines overload protection with magnetic short-circuit protection for stable, repeatable response under a broad range of loads and fault conditions.
• OEM-compatible design: Specifically shaped to fit and function with matching Square D OEM load centers and panelboards, ensuring reliable coordination with existing protection schemes.
• Three-pole configuration: Ideal for 3-phase circuits and panelboard setups that require balanced protection across all phases.
• Reliable for diverse environments: Proven performance in residential, commercial spaces and light industrial applications, from motors and HVAC to lighting and receptacle circuits.

Technical snapshot

• Manufacturer: Square D
• Part Number: HJA36100U44X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100 A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical applications

Use this 3-pole plug-in breaker to protect branch circuits in panelboards and loadcenters that require solid 3-phase protection up to 100 A. It’s well-suited for:

• Commercial lighting and receptacle circuits in small to mid-size facilities
• Motor loads and HVAC equipment where reliable short-circuit protection is critical
• Upgrading legacy panelboards to ensure coordinated protection with existing Square D devices
• Residential—where a 3-pole arrangement is needed for certain 3-phase or multi-pole configurations in newer installations

Installation realities and smart maintenance tips

Choose this plug-in breaker when you want minimal service interruption and straightforward swaps. To maximize longevity and protection integrity:

• Confirm panelboard compatibility with the HJA36100U44X to ensure proper trip characteristics and labeling alignment.
• Handle with the panel power off; verify zero-energy conditions before installation or replacement.
• Record the amperage rating and trip-type in your panel’s documentation to support future maintenance and safety audits.

When you need a trusted, industry-standard solution for 100 A, 3-pole protection, the Square D HJA36100U44X combines rapid plug-in installation with precise thermal-magnetic protection. It’s a practical, durable choice for keeping circuits guarded in a wide range of panelboard environments.