Eaton KD3400C - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Introducing the Eaton KD3400C—400 A, 600 V, 3-pole molded case circuit breaker, designed to deliver dependable branch-circuit protection for panelboards and loadcenters. Built to handle demanding electrical loads with precision, it helps protect wiring and equipment from overloads and short circuits so your systems stay reliable.

Key benefits that matter in real-world installations

• Space-efficient molded case design minimizes panel crowding and makes retrofits or upgrades in existing panels straightforward, helping you maximize every inch of panel space without sacrificing protection.
• Thermal-magnetic trip unit combines temperature-sensitive protection with magnetic fault detection, delivering stable, repeatable trip performance under varying load conditions and fast response to short circuits.
• OEM-compatible for seamless integration designed to drop into matching Eaton loadcenters and panelboards, ensuring consistent electrical characteristics and hassle-free installation.
• Versatile for multiple applications suitable for residential, commercial, and light industrial environments where robust overcurrent and short-circuit protection is essential.

Technical snapshot

• Manufacturer: Eaton
• Part number: KD3400C
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 400 A
• Voltage rating: 600 V
• Number of poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Who will benefit most

• Electrical pros upgrading or expanding panelboards in residential or commercial spaces where a reliable 3-pole, 400 A protection device is required
• Maintenance teams managing loadcenters in light industrial settings that demand consistent trip behavior and compatibility with OEM panels
• Specifiers seeking a trusted, durable molded case breaker with a clear specification to match existing Eaton infrastructure

Why this model stands out

• Durable, compact design paired with a precise thermal-magnetic trip means fewer nuisance trips and better protection alignment with wire sizing and panel ratings.
• OEM compatibility reduces procurement surprises and ensures that replacement and service parts align with your existing Eaton ecosystem.
• A robust solution for feeders and main/branch circuits in diverse environments—delivering reliable protection where it matters most without overbuilding the panel space.

When you choose the Eaton KD3400C, you’re selecting a proven, purpose-built solution for reliable circuit protection in panelboards and loadcenters. Ideal for projects that require a compact, high-capacity 3-pole breaker with predictable trip characteristics, backed by Eaton’s engineering integrity and compatibility across Eaton OEM panels. Available through AmpState as a trusted source for electrical equipment, this KD3400C helps you build safer, more dependable electrical distributions.