Square D FA34100 - 100 A, 3-Pole Plug-In Circuit Breaker | AmpState

Engineered for dependable branch circuit protection, the Square D FA34100 is a 100 A, 3‑pole plug‑in molded case circuit breaker designed to fit seamlessly into compatible panelboards and load centers. Its fast plug‑in connection simplifies installation and replacement, helping electricians and facility managers minimize downtime during upgrades or maintenance.

Key benefits that matter in the field

• Plug‑in convenience: Rapid installation and easy replacement reduce labor time and panel downtime.
• Thermal‑magnetic protection: A precise trip unit delivers stable, repeatable overcurrent and short‑circuit protection across varying electrical loads.
• Reliable 100 A, 3‑pole design: Robust protection for three‑phase circuits, ideal for distributing balanced power in larger loads.
• OEM‑aligned compatibility: Specifically designed to pair with matching Square D OEM loadcenters and panelboards for a seamless fit and consistent performance.
• Versatile applications: Suitable for residential, commercial, and light industrial environments where dependable circuit protection is critical.

What makes the FA34100 unique

This molded case circuit breaker isn’t just a generic safety device. The FA34100 combines a plug‑in mounting style with a thermal‑magnetic trip system that reacts quickly to overloads while maintaining stable protection during steady‑state operation. Its three‑pole configuration supports three‑phase systems or single‑phase configurations in certain panelboard layouts, giving you flexibility in design and upgrades. By matching Square D’s trusted engineering, it offers consistent performance, predictable trip characteristics, and straightforward integration into existing electrical infrastructure.

Ideal use cases

• Upgrading or expanding panelboards in residential subdivisions, light commercial spaces, or small industrial facilities.
• Replacing aging or failed breakers in service entrances, subpanels, or main distribution panels where quick plug‑in installation saves time.
• New installations requiring a reliable 100 A, 3‑pole protection device with plug‑in compatibility to streamline procurement and setup.

Technical specifications

• Manufacturer: Square D
• Part Number: FA34100
• 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

Practical considerations and installation tips

For best results, pair this FA34100 with matching OEM loadcenters or panelboards to ensure optimal fit and coordinated protective characteristics. When performing installations or replacements, verify panel compatibility and observe standard electrical safety practices. The plug‑in design enables quicker swaps in maintenance windows, reducing panel downtime and enabling faster restoration of service for critical circuits.

Who benefits the most

Electricians, facilities managers, and contractors overseeing residential, commercial, or light industrial electrical systems will appreciate the combination of fast installation, reliable thermal‑magnetic protection, and OEM compatibility. If you’re upgrading a panel, replacing an aging breaker, or designing a three‑phase distribution scheme, the Square D FA34100 delivers dependable protection with installation efficiency that keeps projects moving.