Eaton Cutler-Hammer QC3040H 40A 3P 240V Circuit Breaker | AmpState

Eaton Cutler-Hammer QC3040H is a dependable 40 A, 3-pole, 240 V circuit breaker designed to shield panelboards, load centers, and electrical distribution networks from overloads and short circuits. Built to fit into Eaton’s QC lineup, this breaker is a trusted choice for both new installations and retrofit projects where keeping the exact part number matters for compatibility and service continuity.

Why this breaker stands out

• Exact spec alignment for 3-phase systems — 3-pole design handles multi-wire loads; 240V operation suits common commercial and industrial configurations.
• Part-number consistency — QC3040H labeling and footprint mean fewer compatibility questions during maintenance or retrofits.
• Retrofit-ready — ideal when updating or stocking spare parts across multiple panels without changing other components.
• AmpState availability — sourced from AmpState, ensuring reliable supply for maintenance cycles and projects.
• Supports reliable protection for equipment like motors, conveyors, HVAC controls, and other 3‑phase loads.

Who benefits

Electrical contractors, facilities managers, and maintenance teams working with legacy Eaton Cutler-Hammer panels benefit from having a QC3040H on hand to minimize downtime and keep service labeling consistent.

Practical use cases

• Retrofit older panelboards that previously used the QC line — maintaining exact part numbers simplifies ordering and documentation.
• Protect three-phase machinery and HVAC equipment running on 240V with a dedicated 40A safety margin.
• Stock for planned maintenance: quick swaps keep electrical distribution running smoothly during service windows.

Compatibility & how we help

Need to confirm fit? Message us and we’ll help verify compatibility with your Eaton panel or distribution setup. AmpState can assist in locating the correct QC3040H replacement or cross-reference within the QC series.

Specifications at a glance

• Amperage: 40 A
• Poles: 3
• Voltage: 240 V
• Part Number: QC3040H
• Manufacturer: Eaton Cutler-Hammer

Stocked by AmpState, the QC3040H is ready for order when you need dependable three‑phase protection with consistent part‑numbering across projects. Order the QC3040H today and keep your Eaton panel system protected with a trusted, compatible replacement part.