DK3350Y - 350Amp Circuit Breaker

DK3350Y 350 Amp circuit breaker

If you’re working with an existing electrical system, you don’t want guesswork—you want a breaker that fits right, installs cleanly, and performs exactly as expected. The DK3350Y 350 amp circuit breaker is built for that purpose. Designed on a K-Frame platform, this 3-pole thermal magnetic breaker is commonly used in commercial and industrial setups where steady, dependable circuit protection matters. It handles both overloads and short circuits with a straightforward, proven trip mechanism, while its 65kA interrupting rating at 240VAC gives it the capacity to deal with demanding fault conditions. What makes this unit especially practical is its non-interchangeable trip unit, which keeps protection settings consistent—no adjustments, no surprises. Add in the included line-side lugs and you’ve got a breaker that’s easier to install and integrate into existing panel configurations. It’s also HACR rated, making it a solid choice for HVAC-related systems, and designed to operate in 40°C environments where heat is part of the equation. Bottom line: this is a dependable, built-to-last solution for maintaining the integrity of your electrical distribution system.

Key Features and Benefits

• 350 amp rating supports high-demand electrical loads
• 3-pole design for three-phase system applications
• Thermal magnetic trip mechanism responds to overloads and short circuits
• 65kA interrupting rating at 240VAC for handling fault conditions
• Non-interchangeable trip unit ensures consistent protection settings
• Line-side lugs included for easier installation
• HACR rated for heating, air conditioning, and refrigeration systems
• Designed for 40°C ambient environments
• K-Frame construction fits compatible existing equipment
• Built to last for long-term use in established systems

Technical Specifications

• Part Number: DK3350Y
  
• Amperage: 350A
  
• Poles: 3
  
• Interrupting Rating: 65kA @ 240VAC
  
• Frame Type: K-Frame (DK)
  
• Trip Type: Thermal Magnetic
  
• Trip Unit: Non-Interchangeable
  
• Temperature Rating: 40°C
  
• HACR Rated: Yes
  
• Included Accessories: Line-side lugs
  
• Height: 10.13 in
  
• Weight: 5.5 lbs
  

Material Compliance and Certifications

• Meets established industry standards for electrical safety and performance
• HACR rated for use in HVAC and refrigeration equipment
• Suitable for installation following NEC requirements and applicable local codes

Where It Works Best

The DK3350Y is a natural fit for commercial buildings, industrial facilities, and HVAC systems that depend on K-Frame breakers. It’s especially useful when you need a direct replacement in existing panelboards or distribution equipment, where compatibility matters more than anything else. Whether you’re maintaining a facility, servicing equipment, or keeping operations running without interruption, this breaker fits into place and does its job without complication.