Eaton GD3040 - 40 A, 480 V, 3-Pole Circuit Breaker | AmpState

Meet the Eaton GD3040 — a rugged 40A, 480V, 3-pole molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. With a compact form and a thermal-magnetic trip unit, it provides stable, repeatable protection for today’s demanding electrical systems while keeping panel space to a minimum.

• Compact, space-efficient design: engineered to maximize panel real estate, making it easier to fit multiple circuits in tighter spaces without compromising protection.
• Thermal-magnetic trip unit: combines precise thermal overload protection with instantaneous magnetic tripping for short circuits, reducing nuisance trips and safeguarding wiring under surge conditions.
• 3-pole, 480V operation: ideal for three-phase distribution in commercial and light industrial applications, delivering balanced protection across all phases.
• 40A protection: provides targeted overcurrent protection for motors, controllers, lighting, and other mid-range loads common in professional settings.
• OEM panel compatibility: designed to drop into matching Eaton loadcenters and panelboards, ensuring straightforward replacement, reliable bus alignment, and consistent trip characteristics.
• Versatile applications: suitable for residential, commercial, and light industrial environments where dependable circuit protection is essential for safety and uptime.

Use cases and practical insights: In a commercial service panel or a light industrial distribution cabinet, the GD3040 protects branch circuits feeding HVAC equipment, pumps, conveyors, and other 3‑phase loads. Its 480V rating aligns with typical three-phase service upgrades, while the 40A setting matches mid‑demand circuits. When upgrading or expanding an Eaton ecosystem, choosing the GD3040 helps maintain uniform protection behavior across devices, simplifying maintenance and coordination.

• What it protects: branch circuits against overloads and short circuits, preserving wire insulation and system integrity.
• Who should consider it: electrical technicians, facilities managers, and contractors working with Eaton panelboards or upgrading legacy gear in commercial or light industrial facilities.
• Installation note: install in compatible Eaton panelboards/loadcenters with proper bus alignment and torque specifications for reliable operation.

• Manufacturer: Eaton
• Part Number: GD3040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 40A
• Voltage: 480V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

In short, the Eaton GD3040 delivers reliable, coordinated protection for 3‑phase systems in a compact package. It’s a practical choice when you need trusted performance, straightforward compatibility with Eaton OEM panels, and a design that respects space and serviceability in busy electrical environments.