Square D HJA36100U43X - 100 A, 3-Pole Plug-In Circuit Breaker | AmpState

Introducing the Square D HJA36100U43X, a 100 A, 3-pole plug-in molded-case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for fast, reliable integration, this device is a smart upgrade for Square D systems that demand robust protection with quick serviceability.

Key advantages

• Fast plug-in connection enables quick installation and effortless replacement in compatible panelboards and load centers, minimizing downtime during upgrades or servicing.
• Thermal-magnetic trip unit delivers stable, repeatable protection by promptly addressing short circuits while smoothly handling overloads for consistent performance.
• 3-pole design provides balanced protection for 3-phase systems, making it ideal for commercial and light industrial panelboards and motor circuits.
• 100 A rating supports feeders and branch circuits up to 100 amps, delivering reliable protection for mid-size electrical distributions.
• OEM compatibility engineered to fit matching Square D OEM load centers and panelboards for a seamless, reliable install.
• Versatile across settings suitable for residential, commercial, and light industrial environments, enabling flexible use in new builds or replacements.

Use cases and suitability

• Replacing aging or faulty breakers in Square D panelboards to restore proper protection and trip performance.
• Motor and equipment circuits in commercial and light industrial spaces that require 3-phase protection up to 100 A.
• New installations in small-to-mid size commercial facilities where fast plug-in deployment simplifies panel assembly and maintenance.

Technical snapshot

• Manufacturer: Square D
• Part number: HJA36100U43X
• Type: Thermal-magnetic molded-case circuit breaker (MCCB)
• Amperage rating: 100 A
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Designed for reliability in continuous operation, the Square D HJA36100U43X brings proven protection to your electrical distribution. Whether you’re upgrading a panel, replacing a worn breaker, or stocking essential spares for service fleets, this 3-pole plug-in breaker delivers the performance and compatibility you need. Add to cart now to secure quick, dependable protection for your Square D panel system.