HMDL3400L - 400Amp Circuit Breaker

HMDL3400L - 400Amp Circuit Breaker

When you’re replacing a circuit breaker in existing equipment, getting the specifications right matters. The Eaton HMDL3400L is a 400-amp, three-pole molded case circuit breaker from the Eaton Series C line, built around the MDL frame and HMDL breaker configuration. It comes as a complete breaker with a T186 trip type and is rated for operation at 50–60 Hz.

Key Features and Benefits

• 400A rating for electrical applications designed around this amperage requirement.
• Three-pole construction for compatible three-phase electrical systems.
• Part of the Eaton Series C molded case circuit breaker family.
• Uses the MDL frame and HMDL breaker configuration.
• T186 trip type for applications calling for this specific breaker setup.
• Designed for 50–60 Hz electrical systems.
  

Technical Specifications

• Catalog Number: HMDL3400L
  
• Manufacturer: Eaton
  
• Product Type: Molded case circuit breaker
  
• Series: Series C
  
• Breaker Type: HMDL
  
• Frame: MDL
  
• Frame Type: Complete breaker
  
• Amperage Rating: 400 A
  
• Number of Poles: Three-pole
  
• Trip Type: T186
  
• Frequency Rating: 50–60 Hz
  
• Terminals: Included on line and load sides
  
• Interrupt Rating: 100 kAIC at 240 VAC; 65 kAIC at 480 VAC
  
• Length/Depth: 18 in.
  
• Height: 8 in.
  
• Width: 11 in.
  
• Product Weight: 20 lb
  
• Certification: UL Listed
  

Material Compliance and Certifications

The HMDL3400L is UL Listed, an important certification to consider when matching a replacement breaker to the requirements of an existing electrical installation.

The supplied manufacturer information does not identify any additional material compliance certifications for this catalog number. If a job has specific environmental or material requirements, those requirements should be verified separately before the breaker is installed.

Where It Works Best

The HMDL3400L makes the most sense in existing electrical distribution equipment designed for an Eaton Series C HMDL breaker with an MDL frame. It's especially relevant for maintenance and replacement work where matching the original breaker's physical configuration and electrical ratings is the main concern.