DK3300Y - 300Amp Circuit Breaker

DK3300Y - 300 Amp Circuit Breaker

When you’re dealing with high-demand electrical systems, the last thing you want is uncertainty. The DK3300Y is built for exactly those situations—where reliability matters and failure isn’t an option. This 300-amp, 3-pole breaker uses a thermal magnetic trip mechanism that reacts the way it should: steady protection for overloads, instant action when a short circuit hits. No guesswork, no hesitation. With a 65kA interrupting rating at 240VAC, it’s more than capable of handling serious fault conditions. It’s also HACR rated, which makes it a solid choice for HVAC setups and similar equipment. And because it comes with line-side lugs already included, installation is more straightforward—less time sourcing parts, more time getting your system up and running.

Key Features and Benefits

• 300A, 3-pole design for dependable three-phase protection
• 65kA interrupting capacity at 240VAC handles high fault levels with confidence
• Thermal magnetic trip unit for both overload and short-circuit protection
• Non-interchangeable trip helps maintain consistent performance
• HACR rated—well-suited for HVAC and refrigeration systems
• Line-side lugs included, so you’re not chasing extra parts
• K-frame construction designed for long-term, steady use

Technical Specifications

• Part Number: DK3300Y
  
• Poles: 3
  
• Amperage: 300A
  
• Interrupting Rating: 65kA @ 240VAC
  
• Frame Type: DK (K-Frame)
  
• Trip Type: Thermal Magnetic (Non-Interchangeable)
  
• Temperature Rating: 40°C
  
• HACR Rated: Yes
  
• Included: Line-side lugs
  
• Shipping Weight: 5.5 lbs
  
• Height: 10.13 inches
  

Material Compliance and Certifications

• This breaker meets standard expectations for molded case circuit breakers used in commercial and industrial environments.
• The HACR rating confirms it’s appropriate for heating, air conditioning, and refrigeration equipment.
• It’s designed to operate in typical 40°C conditions—just be sure to match it with your local code requirements and application specs.

Where It Works Best

• You’ll typically see the DK3300Y in commercial buildings, industrial panels, and HVAC-heavy systems—anywhere you’ve got larger loads and need protection you don’t have to think twice about. It’s a practical choice for motor loads, compressors, and distribution setups where consistency matters more than anything flashy.