HMDL3350 - 350Amp Circuit Breaker

HMDL3350 - 350Amp Circuit Breaker

When you’re replacing a circuit breaker in existing equipment, getting the details right matters. The Eaton HMDL3350 is a 350-amp, three-pole molded case circuit breaker from Eaton’s Series C line, built around the MDL frame and supplied as a complete breaker. It uses a T186 trip type and is rated for 50–60 Hz operation. Its interrupting ratings are 100 kAIC at 240 VAC and 65 kAIC at 480 VAC. Those specifications make the HMDL3350 a practical choice for maintaining compatible electrical equipment that requires this particular breaker configuration.

Key Features and Benefits

• 350A Rating – Designed for compatible applications requiring a 350-amp molded case circuit breaker.
• Three-pole design – Matches electrical equipment requiring a three-pole breaker configuration.
• Series C construction – Part of Eaton’s Series C molded case circuit breaker family.
• HMDL breaker type with MDL frame – Important identifiers when matching an existing breaker or compatible equipment.
• T186 trip type – Provides another key specification for confirming the correct replacement.
• Complete breaker – Supplied as a complete molded case circuit breaker.
• 50–60 Hz frequency rating – Suitable for compatible systems operating within this frequency range.
  

Technical Specifications

• Manufacturer: Eaton
  
• Catalog Number: HMDL3350
  
• 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
  
• Amperage Rating: 350A
  
• Number of Poles: Three-pole
  
• Trip Type: T186
  
• Frequency Rating: 50–60 Hz
  
• 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
  
• UPC: 782114586020
  
• Certification: UL Listed
  

Material Compliance and Certifications

The HMDL3350 is UL Listed, providing installers and maintenance professionals with a recognized certification to reference when determining its suitability for an application.

The supplied manufacturer information does not identify any additional material compliance certifications for this specific catalog number. If a project has specific environmental, material, or regulatory requirements beyond UL listing, those requirements should be verified for the HMDL3350 before installation.

Where It Works Best

The Eaton HMDL3350 makes the most sense in existing electrical distribution equipment designed around the Series C HMDL/MDL configuration. It can be particularly useful for maintenance and replacement situations where keeping the original breaker type and electrical characteristics is important.

Before putting a replacement breaker into service, check more than the catalog number. Confirm that the equipment calls for a 350A, three-pole HMDL breaker with an MDL frame and T186 trip type, and verify the required voltage and interrupting rating as well. Physical fit and the requirements of the equipment in which the breaker will be installed should also be confirmed.