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ECB400NSK - Molded Case Circuit Breaker 400A 600V AC

United Fuses
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The ECB400NSK is a molded case circuit breaker designed for primary overcurrent and short-circuit protection in industrial power distribution systems. It is rated for 400 amps at 600 volts AC, providing reliable interruption of fault currents. This three-pole unit features a compact construction with dimensions of 7.5 inches in length/depth, 3.75 inches in height, and 6 inches in width, weighing 1.32 pounds. The breaker complies with UL 489 and CSA standards for safety and performance in commercial and industrial environments. Typical applications include motor control centers, panelboards, and switchboards requiring robust branch circuit protection.

Key Features & Specifications
  • Type: Molded case circuit breaker, thermal-magnetic trip
  • Voltage Rating: 600 V AC
  • Current Rating: 400 A
  • Dimensions: 7.5 in x 3.75 in x 6 in (Length/Depth x Height x Width)
  • Weight: 1.32 lb
  • Standards: UL 489, CSA
  • Applications: Motor control centers, panelboards, switchboards
  • Poles: 3
  • Frame Size: 400 A frame
  • Trip Type: Thermal-magnetic
  • Circuit Breaker Mounting Style: Fixed
  • Terminal Connection: Line and load lugs
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Three-phase
  • Installation Type: Panelboard or switchboard


Product Identification
  • UPC: 78668966286
  • GTIN: 00786689662868