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Eaton MDL3300W - Molded Case 300A 3-Pole Breaker

Cutler Hammer
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Eaton MDL3300W is a 300 Amp, 3-pole molded case circuit breaker from the Series C family, designed for overcurrent protection in commercial and industrial power distribution systems. It operates at a voltage rating of 600VAC and 250VDC, with a current rating of 300A, and provides LI (Long-Time and Instantaneous) protection via a thermal magnetic trip unit. The unit features a bolt-on connection, an M Frame size, and weighs 33 lb, with a high interrupting capacity of 50kA at 480VAC. This breaker complies with UL safety standards and is suitable for feed-thru mounting in 3-phase applications. Typical uses include protecting branch circuits and main feeders in manufacturing facilities, commercial buildings, and heavy industrial environments.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker
  • Manufacturer: Eaton
  • Family: Series C
  • Type: MDL
  • Weight: 33 lb
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: M Frame
  • Voltage Rating: 600 VAC / 250 VDC
  • Poles: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 50kA @ 480 VAC
  • Phase: 3
  • Current Rating: 300 A
  • Interrupting Capacity: 65 kAIC @ 240 VAC, 50 kAIC @ 480 VAC, 25 kAIC @ 600 VAC
  • Mounting Type: Feed-Thru
  • Frequency: 50/60 Hz
  • UL Listed


This item does not include lugs. If you would like lugs please reach out to a sales rep with wiring specs and we can help you with the lugs part number.