Eaton KDC3350Y - 350 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton KDC3350Y is a rugged 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch-circuit protection for panelboards and load centers. With a substantial 350 A rating and a 600 V capacity, it’s engineered to handle demanding residential, commercial, and light industrial environments where reliable disconnection and robust bus connections matter most.

Why the KDC3350Y stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus, minimizing movement, arcing risk, and nuisance trips in equipment rooms or spaces with equipment vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection for both overloads and short circuits, helping protect wiring and connected equipment from damage while reducing false trips.
• 3-pole design ensures coordinated protection across all phases, improving safety and reliability in three-phase systems common to commercial and light industrial applications.
• OEM-loadcenter compatibility engineered to pair with matching Eaton OEM loadcenters and panelboards, simplifying replacement, upgrades, or phased panel work without sacrificing performance.
• High-capacity performance 350 A rating paired with a 600 V rating makes it suitable for large feeders, subpanels, or service-distribution points where robust protection is required.

Ideal use cases

• Residential service panels and subpanels where a trustworthy, high-amperage protection device is needed
• Commercial electrical rooms and small-to-mid size office builds requiring reliable branch-circuit protection
• Light industrial panels and equipment rooms where vibration resistance and durable bus connections are critical
• Panelboard upgrades or replacements that demand exact-fit mounting and compatibility with OEM components

What problems it solves

• Prevents damage from overcurrent and short-circuit events by quickly interrupting faulty circuits
• Reduces the frequency of trips due to vibration or loose connections thanks to secure bolt-on mounting
• Provides consistent protection characteristics across three phases, helping maintain balanced loads and equipment safety

Installation and practical considerations

• Use in installations that require bolt-on MCCB protection to ensure a sturdy, long-lasting bus connection
• Install in panelboards and load centers designed to accept the KDC3350Y’s bolt-on format and three-pole architecture
• Follow manufacturer torque specifications for mounting hardware to preserve vibration resistance and electrical integrity
• Given its thermal-magnetic trip behavior, there is no user-adjustable trip setting—the device is designed for stable, predictable protection aligned with system ratings

Technical specifications

• Manufacturer: Eaton
• Part Number: KDC3350Y
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 350 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

How it compares to alternatives

Compared with common plug-on or thinner-profile breakers, the KDC3350Y emphasizes a bolt-on connection that resists vibration and movement, making it a preferred choice in panels subject to mechanical stress or periodic reconfiguration. Its thermal-magnetic trip unit provides a balanced approach to protection—offering fast response to short circuits while maintaining dependable overload protection—without the variability of adjustable trip settings. When your installation requires a robust, high-current 3-pole solution that integrates cleanly with OEM panel centers, the KDC3350Y delivers a reliable, purpose-built option designed to work as part of a cohesive Eaton panel ecosystem.

Easy to source, easy to trust

Designed for a straightforward replacement or upgrade path in compatible Eaton panelboards and load centers, the KDC3350Y is a practical choice for projects that demand consistent performance, long service life, and clear alignment with existing electrical infrastructure. Whether you’re refreshing aging equipment, expanding capacity, or consolidating protection on a new circuit, this breaker provides the authoritative combination of amperage, voltage rating, and mechanical fit that professionals rely on.