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Eaton MD3400 - Molded Case 400A 600V 3-Pole

Cutler Hammer
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The Eaton Cutler-Hammer MD3400 is a three-pole molded case circuit breaker from the Series C family, designed to provide thermal-magnetic overcurrent protection for electrical distribution systems. It is rated for 600V AC, 400A continuous current, and delivers an interrupting capacity of 50kA at 480V, with LI (Long-Time and Instantaneous) trip functions for precise fault management. This feed-thru connection breaker weighs 34 lb and features a compact molded case construction suitable for panelboard or switchboard installation. It complies with UL 489 and NEMA standards for industrial-grade circuit protection. Typical applications include main or feeder protection in commercial and industrial power distribution systems.

Key Features & Specifications
  • Type: Molded Case, Thermal Magnetic
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Poles: 3
  • Phase: 3
  • AIC Rating: 50kA@480V
  • Connection: Feed-Thru
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Family: Series C
  • Type: MD
  • Weight: 34 lb
  • Circuit Breaker Mounting Style: Fixed
  • Terminal Connection: Feed-Thru
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-Phase
  • Standards: UL 489, NEMA AB-1
  • Installation Type: Panelboard/Switchboard
  • Breaker Frame: MD
  • Current Rating: 400A


Product Identification
  • UPC: Not provided
  • GTIN: Not provided