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J3B400 - Molded Case Circuit Breaker 400A 600V AC

United Fuses
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J3B400 is a molded case circuit breaker designed for overcurrent protection in industrial electrical systems. It is rated for a voltage of 600V AC and a current of 400A, providing reliable interruption of fault currents. The unit weighs 5.19 lb and features a compact construction suitable for panelboard or switchboard installation. It complies with UL 489 and NEMA standards for safety and performance. This breaker is commonly used in manufacturing facilities, commercial buildings, and power distribution systems.

Key Features & Specifications
  • Type: Molded case circuit breaker
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Weight: 5.19 lb
  • Standards: UL 489, NEMA
  • Applications: Manufacturing facilities, commercial buildings, power distribution
  • Breaker Type: Molded case
  • Frame Size: 400A frame
  • Trip Type: Thermal-magnetic
  • Poles: 3-pole
  • Connection: Line and load terminals
  • Mounting: Panelboard or switchboard
  • Frequency Rating: 50/60 Hz
  • Phase: 3-phase
  • AIC Rating: 65 kAIC at 240V AC
  • Insulation Temperature: 75°C
  • Terminal Connection: Copper or aluminum
  • Circuit Breaker Mounting Style: Fixed
  • Installation Type: Panelboard or switchboard
  • Item QTY: 1
  • Breaker Frame: 400A
  • Current Rating: 400A
  • Operating Temperature Maximum Celsius: 40°C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: Not available
  • GTIN: Not available