Eaton BR340 - 40 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Eaton BR340 — a 40A, 240V, 3-pole plug-in molded case circuit breaker engineered for dependable branch-circuit protection in panelboards and load centers. This unit combines a fast plug-in connection with a thermal-magnetic trip design to deliver stable, repeatable protection for everyday electrical loads, while simplifying upgrades and replacements in busy electrical rooms.

Fast, reliable protection with plug‑in ease

• Fast plug-in connection enables quick installation and simple replacement, minimizing downtime during panel upgrades or service work.
• Thermal‑magnetic trip unit provides stable protection against both overcurrent and short-circuit events, reducing nuisance trips and preserving circuit integrity.
• Three-pole design ensures synchronized tripping on 3‑phase systems, maintaining balance and safety across the entire load center.
• OEM panel compatibility is designed to align with matching Eaton load centers and panelboards for a secure fit and reliable performance.
• Versatile applications suitable for residential, commercial, and light industrial environments where dependable protection matters.

Technical specifications at a glance

• Manufacturer: Eaton
• Part Number: BR340
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• New installations in panelboards and load centers that require robust, reliable branch-circuit protection.
• Retrofits and replacements in residential service panels or light commercial panels where quick, secure plug-in installation saves time.
• 3-phase systems in small to mid-size commercial and light industrial environments needing coordinated protection across all poles.
• Subpanels and main distribution panels where compatible OEM components help ensure consistent performance.

Why this breaker stands out

• Designed to minimize install time and maximize uptime with a straightforward plug-in approach.
• “Thermal-magnetic protection” delivers predictable trip behavior under normal loading and surge events, protecting downstream equipment.
• Compatibility with Eaton OEM panels means fewer fit issues and a cleaner, more reliable panel deployment.
• Targeted for residential, commercial, and light industrial use, bridging everyday circuit protection with durable, field‑tested performance.

Installation and practical tips

When upgrading or replacing with the BR340, ensure the panelboard is compatible with BR-series plug-in breakers and rated for 240 V, 3‑pole protection. Follow standard electrical practices: verify power is off before installation, seat the breaker firmly in the bus and mounting rails, and confirm proper alignment with the panel’s busbar. Use the correct tools and torque specifications for secure lug connections, and keep spare breakers of the same type on hand for quick future replacements.