Square D FI36090 - 90 A, 3-Pole Plug-In Circuit Breaker | AmpState

Square D FI36090 90A, 3-Pole Plug-In Molded-Case Circuit Breaker — available from AmpState — delivers reliable branch-circuit protection for panelboards and load centers in residential, commercial, and light industrial environments. Built with a fast plug-in connection, it minimizes installation time and downtime when replacing breakers or upgrading panels, while maintaining safety and dependable performance.

Key benefits you can count on

• Fast plug-in installation: streamlined connection for quick swaps in compatible Square D panelboards and load centers, reducing service interruptions.
• Thermal-magnetic trip unit: combines a dependable thermal overload protection with an instantaneous magnetic trip for short-circuit events, delivering stable, repeatable protection across operating conditions.
• 3-pole, 90A design: ideal for 3-phase circuits and balanced protection in commercial or light industrial setups.
• OEM-compatible: engineered to fit and function with matching Square D OEM load centers and panelboards, preserving listing and wiring integrity.
• Versatile applications: well-suited for new installations, panel upgrades, or service improvements in a range of environments from homes to small offices and workshops.

Technical snapshot

• Manufacturer: Square D
• Part number: FI36090
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 90A
• Poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical scenarios

Whether you’re upgrading an existing panel or deploying a new one, the FI36090 provides dependable protection for 3-phase services and shared circuits in:

• Residential multi-family units and basements requiring robust branch-circuit protection
• Small commercial offices, retail spaces, and light industrial environments with 3‑phase or multi-wire circuits
• Panelboard refresh projects where quick, reliable replacement minimizes downtime

Why this matters in the real world

Choosing the FI36090 isn’t just about meeting a specification—it’s about keeping electrical systems safe and up to code with minimal disruption. The combination of a fast plug-in connection, a thermal-magnetic trip for steady protection, and OEM-compatible design means you get a breaker that fits right the first time and continues to perform reliably under varying loads and conditions.

For installers and maintenance professionals, this 90A 3-pole plug-in breaker is a practical, code-conscious choice that supports efficient service workflows, reduces replacement time, and helps maintain uninterrupted power to critical circuits in both commercial and residential settings.