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Thomas & Betts MD40F3 - 40A 3-Pole 65kAIC Circuit Breaker

Thomas & Betts
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The Thomas & Betts MD40F3 is a molded case circuit breaker designed for primary overcurrent and short-circuit protection in industrial power distribution systems. It is rated for 480V AC and carries a continuous current rating of 40 amps, with a 3-pole configuration and a 65kAIC at 480V AC. The unit features a thermal-magnetic trip mechanism, a compact frame size, and weighs 6.6 lb, with dimensions suitable for panelboard or switchboard mounting. It complies with UL 489 and CSA standards, ensuring reliable performance in commercial and industrial environments. Typical applications include motor control centers, lighting panels, and feeder circuits in manufacturing facilities.

Key Features & Specifications
  • Type: Molded case circuit breaker, thermal-magnetic trip
  • Voltage Rating: 480V AC
  • Current Rating: 40 amps
  • Poles: 3
  • AIC Rating: 65kAIC at 480V AC
  • Frame Size: Compact
  • Trip Type: Thermal-magnetic
  • Standards: UL 489, CSA
  • Weight: 6.6 lb
  • Manufacturer: ABB


Product Identification
  • UPC: 78621084055
  • GTIN: 00786210840550