Eaton KDB3300C - 300 A, 600 V, 3-Pole Circuit Breaker | AmpState

Eaton’s KDB3300C is a rugged 3-pole molded case circuit breaker engineered for dependable branch circuit overcurrent and short‑circuit protection in panelboards and loadcenters. With a robust 300 A rating at 600 V, it’s built to keep commercial, light industrial, and multi‑unit residential systems safe and serviceable.

What sets the KDB3300C apart:

• Compact molded case design: Maximizes panel space, making it easier to route wires and fit additional protection where you need it most.
• Thermal‑magnetic trip unit: Delivers stable, repeatable protection. The thermal element guards against nuisance overloads, while the magnetic element delivers instantaneous response to high‑energy short circuits, maintaining reliable operation across varying temperatures.
• Three‑pole construction: Protects all three phases with a coordinated trip, simplifying wiring and enhancing safety in 3‑phase panel setups.
• OEM panelboard compatibility: Designed to work with matching Eaton OEM load centers and panelboards, ensuring straightforward replacement and seamless integration.
• Versatile applications: Ideal for residential, commercial, and light industrial installations where dependable protection and space efficiency matter.

Technical specifications

• Manufacturer: Eaton
• Part number: KDB3300C
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 300 A
• Voltage rating: 600 V
• Number of poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker is the right choice for your panel

When you need reliable protection without compromising panel space, the KDB3300C delivers. Its coordinated three‑pole action simplifies maintenance and ensures uniform protection across all phases. The combination of a compact footprint with a durable thermal‑magnetic trip mechanism translates into fewer nuisance trips, faster fault isolation, and easier future upgrades in both new builds and retrofit projects.

Suggested use scenarios:

• Residential multi‑family unit panels where space is at a premium but protection must be uncompromising
• Commercial electrical rooms serving lighting, outlets, and HVAC equipment with three‑phase circuits
• Light industrial panels protecting feeders and motors in compact, space‑constrained enclosures

Practical tips for optimal performance:

• Pair the KDB3300C with compatible Eaton OEM load centers and panelboards to ensure electrical coordination and labeling clarity.
• Verify system requirements match the 300 A, 600 V rating and apply appropriate conductor sizing to support the protection level.
• Consider future expansion: the compact form factor helps you add protection modules without reworking the panel layout.