Eaton BR390ST - 90 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Eaton BR390ST—a 90A, 240V, 3‑pole Plug-In Molded Case Circuit Breaker designed to protect panelboards and load centers with precision and speed. Built for dependable branch circuit overcurrent and short-circuit protection, it’s a smart choice for both new installations and panel upgrades.

• Fast plug-in connection simplifies installation and quick replacement, minimizing downtime during maintenance or upgrades.
• Thermal-magnetic trip unit delivers stable, repeatable protection across a wide range of fault conditions, reducing nuisance trips while safeguarding sensitive equipment.
• 3-pole, 90A, 240V configuration supports three-phase circuits essential in commercial and light industrial settings.
• OEM-compatible engineered to fit matching Eaton panelboards and load centers for reliable performance and seamless integration.
• Versatile applications ideal for residential, commercial, and light industrial protection needs where dependable trip performance matters.

Technical snapshot

• Manufacturer: Eaton
• Part number: BR390ST
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 90 A
• Voltage rating: 240 V
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

The BR390ST shines in any scenario requiring reliable three-phase protection delivered with speed and simplicity. It’s particularly well-suited for panel installations where downtime matters, or in upgrades where matching OEM hardware ensures consistent performance and warranty support.

Why this breaker matters

• Plug-in design accelerates serviceability and reduces field installation complexity, keeping panels up and running with minimal disruption.
• Thermal-magnetic trip technology provides predictable interruption behavior, protecting motors, controls, and downstream circuits from damaging faults.
• OEM compatibility ensures a coordinated fit with Eaton panelboards and load centers, preserving system integrity and ease of parts management.

Practical use cases

• Upgrade or replace aging 3‑pole breakers in commercial or light industrial panelboards to accommodate three‑phase loads with a robust 90A protection level.
• Integrate into new installations where a reliable 3‑pole plug-in solution is required for motor control centers or three‑phase distribution.
• Maintain consistent maintenance practices by stocking a standard, compatible BR390ST breaker for rapid, code‑compliant service events.