Eaton KD3300Y - 300 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton KD3300Y is a rugged 3-pole bolt-on molded case circuit breaker engineered to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. With a robust bolt-on mounting design and a thermal-magnetic trip unit, this breaker stays securely connected and provides stable, repeatable protection across a range of demanding electrical environments.

• Secure bolt-on mounting—a rigid connection to the bus minimizes vibration, reducing wear and maintaining reliable continuity in distribution panels.
• Thermal-magnetic trip unit—combines time-delayed thermal protection with instantaneous magnetic tripping for precise, predictable response to overloads and short circuits.
• OEM-compatible—designed to be used with matching Eaton OEM loadcenters and panelboards, ensuring a cohesive, certified fit within your distribution system.
• Versatile for multiple sectors—suitable for residential, commercial, and light industrial applications where dependable protection is essential.
• Three-pole configuration—ideal for 3-phase systems that require balanced protection across all conductors.

Why this matters in real-world setups: when you’re upgrading, retrofitting, or completing a new installation, the KD3300Y delivers consistent protective performance under varying ambient conditions. The thermal-magnetic trip keeps nuisance trips in check while still delivering immediate response when a short circuit occurs, helping safeguard wiring, devices, and downstream equipment.

Technical snapshot

• Manufacturer: Eaton
• Part Number: KD3300Y
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 300 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical considerations

For electricians and facilities managers, the KD3300Y is a reliable choice when you need:

• Upgrading existing panelboards or loadcenters that require a high-current, three-phase protective device.
• Dedicated main feeders or feeder protection in commercial spaces where 3-phase distribution is common.
• A bolt-on solution that simplifies installation in setups where vibration resistance and solid mechanical mounting are priorities.
• Durable protection in light industrial environments where consistent trip characteristics matter for uptime and safety.

With the KD3300Y, you’re choosing a proven Eaton design that aligns with OEM panel compatibility and delivers dependable protection across a range of demanding electrical installations. For professionals stocking their electrical distribution inventory, this breaker combines robust construction, precise protection, and straightforward integration into compatible panelboards and loadcenters.