Eaton Cutler-Hammer BD3040 40A 1P 120V Circuit Breaker, Plug-On | AmpState

Eaton Cutler-Hammer BD3040 is a 40A, 1-pole, 120V plug-on circuit breaker designed for dependable protection in panelboards, load centers, and electrical distribution systems. Built to support replacement projects and spare stocking, the BD3040 helps you keep your bill of materials aligned with the original part number for a seamless install and ongoing reliability.

Why the BD3040 stands out

• Plug-on installation simplifies electrical work by enabling fast, tool-friendly mounting on standard bus bars—so downtime is minimized during replacement or maintenance.
• Original-part compatibility ensures it fits existing panelboards and distribution setups without the guesswork, helping you avoid mismatched breakers and risky substitutions.
• Reliable protection with a 40-amp rating provides solid overcurrent protection for circuits that require firm, predictable safeguarding in both residential and commercial environments.
• BOM alignment—stocking BD3040 keeps your spare inventory consistent with the original design, reducing ordering errors and accelerating rebuilds after faults.

Ideal use cases

• Replacing a blown or worn 1-pole, 120V breaker in existing panelboards and load centers.
• Maintaining BOM fidelity for service vans, maintenance depots, and facilities that rely on Eaton Cutler-Hammer components.
• Stocking reliable spares for quick response to electrical distribution issues in commercial spaces, workshops, and small-to-mid-size buildings.

Specifications at a glance

• Manufacturer: Eaton Cutler-Hammer
• Part number: BD3040
• Type: Circuit Breaker
• Amperage: 40 A
• Poles: 1
• Voltage: 120V
• Mounting: Plug-On

What makes this different from other breakers

Instead of simply listing a spec, the BD3040 emphasizes real-world compatibility and serviceability. Its plug-on design minimizes installation steps, while its alignment with original BOMs helps maintain certified configurations. This means fewer surprises during audits or rebuilds and more consistent performance across your electrical distribution network.

Support and compatibility

Need help confirming fit? AmpState offers guidance to ensure the BD3040 matches your panelboard or load center. Reach out to verify compatibility with your exact equipment, and we’ll help confirm the right part number and installation approach so you can proceed with confidence.

Practical tips for installation and maintenance

• Always de-energize the electrical system and follow proper lockout/tagout procedures before replacing a breaker.
• Verify the panelboard’s listing and ensure a single-pole, 120V configuration aligns with your circuit requirements.
• Match the BD3040 to your BOM to maintain documentation coherence and future serviceability.
• Keep the spare BD3040 on hand in a dedicated electrical maintenance stock to reduce downtime during outages or faults.

Available from AmpState, the Eaton Cutler-Hammer BD3040 is a purpose-built solution for reliable circuit protection, straightforward replacement work, and inventory that stays true to the original design. If you’re planning a panel upgrade, routine maintenance, or simply stocking essential spares, this 40A, 1P, 120V plug-on breaker is a dependable choice for uninterrupted electrical distribution.