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LMBC-300 - Molded Case Circuit Breaker 300A 600V AC

United Fuses
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LMBC-300 is a molded case circuit breaker designed for primary overcurrent protection in industrial electrical systems. It is rated for 300 amps at up to 600 volts AC, with a current rating of 300A and a weight of 5.19 lb. The breaker features a compact frame size, thermal-magnetic trip type, and a panel-mounted enclosure with a lug connection for easy installation. It complies with UL 489 and NEMA AB-1 standards for safety and performance. Typical applications include motor control centers, distribution panels, and heavy machinery in manufacturing and processing facilities.

Key Features & Specifications
  • Type: Molded case circuit breaker, thermal-magnetic trip
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Weight: 5.19 lb
  • Standards: UL 489, NEMA AB-1
  • Applications: Industrial motor control centers, distribution panels, heavy machinery
  • Breaker Type: Molded case
  • Trip Type: Thermal-magnetic
  • Panel Type: Panel-mounted
  • Connection: Lug
  • Poles: 3
  • Phase: 3
  • Frame Size: Compact
  • Mounting: Panel
  • Enclosure: Open
  • Amperage: 300A
  • Voltage: 600V AC
  • Hz: 50/60
  • Circuit Breaker Mounting Style: Panel
  • Terminal Connection: Lug
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-phase
  • Standards: UL 489, NEMA AB-1
  • Installation Type: Fixed
  • Item QTY: 1
  • Breaker Frame: 300A frame
  • Current Rating: 300A
  • Operating Temperature Maximum Celsius: 40°C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


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