DK3300 - 300Amp Circuit Breaker

DK3300 - 300 Amp Circuit Breaker

The Eaton DK3300 molded case circuit breaker is designed for electrical distribution systems that need dependable protection at higher amperage levels. Rated at 300 amps with a three-pole configuration, this breaker is commonly used in three-phase power systems found in commercial buildings and industrial facilities. As part of Eaton’s Series C line, the DK3300 is built to interrupt dangerous fault currents and help prevent damage to connected equipment. It uses a T186 trip unit, which responds when current exceeds safe operating levels, helping protect circuits from overloads and short circuits. The breaker carries an interrupting rating of 65 kAIC at 240 VAC and 10 kAIC at 250 VDC, allowing it to handle demanding electrical conditions where higher fault levels may occur. A K-frame molded case design keeps the breaker compact enough for many switchboards and panel installations, while aluminum terminals provide reliable connections for both line and load wiring. For contractors and maintenance teams working with larger distribution systems, the Eaton DK3300 offers a practical and proven option for circuit protection.

Key Features and Benefits

• 300 Amp capacity suitable for protecting high-load electrical circuits
• Three-pole breaker designed for three-phase power distribution systems
• Interrupting capacity of 65 kAIC at 240 VAC and 10 kAIC at 250 VDC
• T186 trip unit that reacts to overload and short-circuit conditions
• K-frame molded case design that fits many commercial and industrial panels
• Line and load terminal configuration for straightforward wiring
• Part of the Eaton Series C family of molded case circuit breakers

Technical Specifications

• Catalog Number: DK3300
• Product Type: Molded Case Circuit Breaker
• Series: Series C
• Breaker Type: DK
• Frame Size: K Frame
• Amperage Rating: 300 A
• Poles: 3
• Voltage Rating: 240 VAC / 250 VDC
• Interrupt Rating:
  • 65 kAIC at 240 VAC
  • 10 kAIC at 250 VDC
• Trip Type: T186
• Frequency: 50–60 Hz
• Terminal Material: Aluminum
• Terminals: Line and Load
• Dimensions: 4.1 in (Depth) × 5.5 in (Height) × 5.5 in (Width)
• Weight: 11.5 lb

Material Compliance and Certifications

• UL Listed: The Eaton DK3300 is UL Listed, confirming that it meets established safety and testing standards for molded case circuit breakers used in U.S. electrical systems.
• Construction: The breaker is manufactured with durable internal components and aluminum terminals designed for consistent electrical conductivity and long-term service.

Where It Works Best

• Breakers like the DK3300 are typically installed in commercial facilities, industrial plants, and larger electrical distribution systems where three-phase power is common.
• It is often used in switchboards, distribution panels, and feeder circuits that require a 300-amp molded case circuit breaker with a strong interrupt rating.
• Contractors, electricians, and facility maintenance teams rely on breakers in this class to help protect equipment, panels, and distribution lines from damaging electrical faults.