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Westinghouse HMA3300T - Trip Unit 600V 300A 3-Pole

Cutler Hammer
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The Westinghouse HMA3300T is a thermal magnetic circuit breaker trip unit designed for overcurrent protection in industrial power distribution systems. It provides LI (Long-Time and Instantaneous) protection functions with a voltage rating of 600V and an adjustable amperage range from 300A minimum to 300A maximum across three poles. The unit measures 6.8 inches in depth, 6.7 inches in height, and 10.4 inches in width, weighing 3.4 lb, and is compatible with MA and HMA frames. It is UL Listed and manufactured in the United States as part of the MARK 75 family.

Key Features & Specifications
  • Type: Trip Unit & Programmer, Thermal Magnetic
  • Voltage Rating: 600V
  • Current Rating: 300A (Minimum and Maximum)
  • Dimensions: 6.8 in x 6.7 in x 10.4 in (Length/Depth x Height x Width)
  • Standards: UL Listed
  • Applications: Industrial power distribution overcurrent protection
  • Poles: 3
  • Protection: LI - Long-Time and Instantaneous
  • Functions: LI - Long-Time and Instantaneous
  • Compatible Frames: MA, HMA
  • Weight: 3.4 lb
  • Family: MARK 75
  • Country of Origin: United States


Product Identification
  • UPC: 786679189702
  • GTIN: 00786679189702