Square D QO3100 - 100 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Square D QO3100 is a 100 A, 240 V, 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 swaps and consistent protection, it’s a trusted choice for maintaining power reliability across residential, commercial, and light industrial environments.

Why this breaker stands out

• Fast plug-in connection enables quicker installation and straightforward replacement, minimizing downtime during panel service or upgrades.
• Thermal-magnetic trip unit provides stable, repeatable protection characteristics across a wide range of fault conditions, helping prevent nuisance trips while still catching dangerous faults.
• OEM-compatible design is built to fit matching Square D load centers and panelboards, ensuring a clean, reliable integration without compatibility surprises.
• Versatile application suitable for residential, commercial, and light industrial electrical systems, making it a practical choice for mixed-use facilities or retrofit projects.

Technical snapshots

• Manufacturer: Square D
• Part Number: QO3100
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Upgrading or repairing residential service panels where a reliable, quick-install breaker is required.
• Panelboard replacements in small commercial spaces and light industrial facilities needing robust 3-pole protection.
• Retrofits in existing Square D QO-series installations where seamless compatibility matters most.

Practical guidance for installation and use

• Confirm compatibility with your panelboard or load center’s OEM specifications to ensure a snug, dependable fit.
• Turn off power, follow all safety protocols, and have a qualified electrician perform the installation to maintain warranty and safety compliance.
• Use as part of a balanced protection strategy for 3-phase, 240 V circuits where heavy loads or equipment demand reliable fault interruption.
• Keep track of part numbers and replacement cycles as part of routine panel maintenance to minimize unexpected outages.

With the Square D QO3100, AmpState provides a plug-in solution that blends rapid serviceability with precise thermal-magnetic protection. This breaker is built to protect your most critical circuits while simplifying maintenance, making it a practical, durable choice for professionals managing diverse electrical systems.