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NEF431040STE4 - Molded Case Circuit Breaker 400A 600V AC

United Fuses
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NEF431040STE4 is a high-capacity industrial circuit breaker designed for primary overcurrent protection in power distribution systems. It is rated for 600V AC and 400A continuous current, with a robust molded case construction and a weight of 5.19 lb. This unit complies with UL 489 and NEMA AB-1 standards, ensuring reliable performance in demanding environments. Typical applications include main feeder protection in commercial and industrial switchboards, panelboards, and motor control centers.

Key Features & Specifications
  • Type: Molded case circuit breaker, thermal-magnetic trip
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Weight: 5.19 lb
  • Standards: UL 489, NEMA AB-1
  • Applications: Main feeder protection, switchboards, panelboards, motor control centers
  • Breaker Type: NEF
  • Frame Size: 400A frame
  • Trip Type: Thermal-magnetic
  • Poles: 3-pole
  • Connection: Line and load side lugs
  • Mounting: Fixed
  • Frequency Rating: 50/60 Hz
  • Phase: 3-phase
  • AIC Rating: 65kA at 240V AC, 35kA at 480V AC, 18kA at 600V AC
  • Operating Temperature: -20°C to 60°C
  • Enclosure: Open type
  • Terminal Connection: Copper or aluminum wire, 2/0 AWG to 600 MCM
  • Installation Type: Panelboard or switchboard mount
  • Item QTY: 1


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