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Eaton LDB3400X - Molded Case Circuit Breaker 400A 3-Pole

Cutler Hammer
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Eaton LDB3400X is a complete molded case circuit breaker from the Series C family, designed for thermal-magnetic overcurrent protection in industrial and commercial power distribution systems. This three-pole, 400A unit operates at 600V with a 35kA interrupting capacity at 480V AC, utilizing LI (Long-Time and Instantaneous) trip functions for precise fault response. The L-frame breaker features a bolt-on connection, weighs 25 lb, and is built with a fixed thermal and fixed magnetic trip mechanism for reliable performance. It is UL 489 certified, ensuring compliance with rigorous safety and performance standards for electrical installations. Typical applications include motor control centers, panelboards, and switchboards requiring robust circuit protection in three-phase systems.

Key Features & Specifications
  • Manufacturer: Eaton
  • Item Subcategory: Molded Case
  • Family: Series C
  • Type: LDB
  • Weight: 25 lb
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: L Frame
  • Voltage Rating: 600V
  • Poles: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 35kA@480V
  • Phase: 3
  • Current Rating: 400A
  • Amperage Rating: 400 A
  • Voltage Rating: 240 Vac, 480 Vac
  • Number of Poles: Three-pole
  • Frame Type: L-Frame
  • Series: Series C
  • Trip Type: Fixed thermal, fixed magnetic (T186)
  • Interrupt Rating: 65 kAIC at 240 Vac, 35 kAIC at 480 Vac
  • Frequency Rating: 50 to 60 Hz
  • Circuit Breaker Type: Complete molded case breaker
  • Certifications: UL 489