LDB3400W - 400Amp Circuit Breaker

LDB3400W - 400Amp Circuit Breaker

One detail makes the LDB3400W especially easy to distinguish from similar breaker configurations: it comes without terminals. That matters when you're matching a replacement to existing equipment, because you need to check the terminal arrangement as carefully as amperage or pole count. The LDB3400W is an Eaton Series C complete molded case circuit breaker rated at 400A, with a three-pole configuration, L frame, and T186 trip type. Its interrupting ratings are 65 kAIC at 240VAC and 35 kAIC at 480VAC, and it carries a 50–60 Hz frequency rating. Physical fit is another part of the equation—the breaker measures 8.25 "H × 8.25" W × 4.06"D and weighs 20 pounds. For existing and legacy electrical systems, these clearly defined specifications give you practical reference points for checking form, fit, and functional compatibility.

Key Features and Benefits

• 400A current rating: Clearly identifies the breaker amperage for comparison with existing equipment requirements.
• Three-pole configuration: Designed for compatible applications that specifically require a three-pole breaker arrangement.
• Series C LDB design: Both the Series C designation and LDB breaker type are important identifiers when matching existing electrical equipment.
• L frame: Provides another key configuration detail for checking form and physical compatibility.
• T186 trip type: An important specification to verify when matching the breaker to the required configuration.
• Supplied without terminals: A particularly important distinction with the LDB3400W. Confirm terminal requirements separately for the intended installation.
• 50–60 Hz frequency rating: Another electrical characteristic to compare with the existing system.

Technical Specifications

• Catalog Number: LDB3400W
  
• UPC: 786679148297
  
• Manufacturer: Eaton
  
• Product Name: Series C Complete Molded Case Circuit Breaker
  
• Product Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Circuit Breaker Type: LDB
  
• Circuit Breaker Frame Type: Complete Breaker
  
• Frame: L
  
• Amperage Rating: 400 A
  
• Number of Poles: 3
  
• Trip Type: T186
  
• Frequency Rating: 50–60 Hz
  
• Interrupt Rating at 240VAC: 65 kAIC
  
• Interrupt Rating at 480VAC: 35 kAIC
  
• Terminals: Without Terminals
  
• Product Height: 8.25 in.
  
• Product Width: 8.25 in.
  
• Product Length/Depth: 4.06 in.
  
• Product Weight: 20 lb
  

Material Compliance and Certifications

The LDB3400W is UL 489 certified. This certification helps confirm when UL 489 compliance is required for the equipment or installation.

Where It Works Best

The LDB3400W 400A 3-pole circuit breaker suits compatible existing and legacy electrical equipment that calls for a Series C LDB molded case circuit breaker with an L frame, T186 trip type, and matching electrical ratings.