HMDL3300L - 300Amp Circuit Breaker

HMDL3300L - 300Amp Circuit Breaker

When you're replacing a breaker in existing electrical equipment, the catalog number and specifications need to match—not just the amperage rating. The Eaton HMDL3300L is a 300A, three-pole Series C molded-case circuit breaker built on the MDL frame and HMDL breaker configuration. It comes as a complete breaker with a T186 trip type and is rated for 50–60 Hz applications.

Key Features and Benefits

• 300A Rating: Matches applications specifically designed around a 300-amp molded case circuit breaker.
• Three-pole configuration: Intended for compatible three-pole electrical distribution equipment.
• Series C design: Part of the Eaton Series C molded case circuit breaker family.
• HMDL breaker configuration: Provides electricians and maintenance personnel with an important identifier for matching an existing breaker.
• MDL frame: Helps confirm physical and application compatibility with equipment requiring this frame.
• Complete breaker: Identified by the manufacturer as a complete circuit breaker.
• T186 trip type: An important specification to check when replacing an existing unit.
• 50–60 Hz operation: Suitable for compatible systems operating within the specified frequency range.
  

Technical Specifications

• Manufacturer: Eaton
  
• Catalog Number: HMDL3300L
  
• Product Name: Series C Complete Molded Case Circuit Breaker
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Circuit Breaker Type: HMDL
  
• Frame: MDL
  
• Circuit Breaker Frame Type: Complete Breaker
  
• Type: Complete Breaker
  
• Amperage Rating: 300A
  
• Number of Poles: Three-pole
  
• Trip Type: T186
  
• Frequency Rating: 50–60 Hz
  
• Terminals : Included Line and Load terminals
  
• Interrupt Rating at 240 VAC: 100 kAIC
  
• Interrupt Rating at 480 VAC: 65 kAIC
  
• Product Length/Depth: 18 in.
  
• Product Height: 8 in.
  
• Product Width: 11 in.
  
• Product Weight: 20 lb
  
• Certification: UL Listed
  

Material Compliance and Certifications

The Eaton HMDL3300L is UL Listed, providing electrical professionals with a clear certification to reference when reviewing an existing installation or a replacement requirement.

Where It Works Best

The Eaton HMDL3300L is best suited to existing electrical distribution applications that require a 300A, three-pole HMDL molded-case circuit breaker with an MDL frame. It can be particularly useful in maintenance and replacement projects where the objective is simple: preserve the equipment's intended configuration and find a breaker with the correct form, fit, and electrical characteristics.