Square D HJA36100U33X - 100 A, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D HJA36100U33X: a 100 A, 3-pole plug-in molded case circuit breaker designed to deliver dependable branch circuit protection for panelboards and loadcenters. Built for steady, repeatable performance, this device secures electrical systems in residential, commercial, and light industrial settings with confidence.

Why this breaker stands out

• Fast plug-in connection facilitates rapid installation and effortless replacement, minimizing downtime during service or upgrades.
• Thermal-magnetic trip unit provides stable, predictable protection against both overloads and short circuits, helping to protect wires, devices, and downstream equipment.
• 3-pole configuration accommodates three-phase circuits, making it ideal for commercial and light-industrial panels where balanced protection is essential.
• OEM-compatible design ensures reliable performance when paired with matching Square D load centers and panelboards, reducing compatibility concerns.
• Plug-in mounting allows straightforward installation within compatible panels, supporting clean wiring and scalable protection for growing electrical systems.

Ideal use cases

• New installations in panelboards where a robust 100 A, 3-pole protective device is required
• Repairs or upgrades in residential, commercial, or light industrial environments needing dependable branch circuit protection
• Panel replacements or expansions where quick plug-in compatibility reduces project timelines

What problems it solves

• Prevents damage from overcurrent and short circuits, shielding conductors and connected equipment
• Eliminates guesswork during replacement thanks to a plug-in design that matches standard OEM panels
• Maintains consistent protection performance through a thermal-magnetic trip mechanism that reacts precisely to electrical faults

Technical snapshot

• Manufacturer: Square D
• Part Number: HJA36100U33X
• Amperage Rating: 100 A
• Number of Poles: 3
• Type: Thermal-magnetic molded case circuit breaker
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Installation tips and best practices

• Verify panel compatibility with OEM specifications before replacing or installing the device—matching load centers ensure optimal performance.
• Power down and lockout-tagout procedures should be followed prior to any replacement or wiring work.
• Keep conductors clean and properly terminated to maintain reliable trip performance and reduce contact resistance.
• Plan for future expansion by pairing this 3-pole breaker with compatible accessories and panel layouts.

Engineered by Square D and offered by AmpState, the HJA36100U33X delivers precise protection where you need it most—in the heart of your electrical system. Whether you’re upgrading a panel, expanding a commercial installation, or outfitting a new service entrance, this 100 A, 3-pole plug-in breaker provides the reliability, compatibility, and ease of installation that professionals rely on.