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Square D MA36400CBA - Molded Case 400A 3-Pole Breaker

Square D
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Square D MA36400CBA is a 3-pole, 400 amp molded case circuit breaker from the I-Line family, designed for overcurrent protection in industrial and commercial power distribution systems. It operates at a maximum voltage rating of 600V and provides a standard interrupting capacity of 30kA at 480V, utilizing a thermal magnetic trip unit with LI (Long-Time and Instantaneous) functions for reliable three-phase protection. The breaker features an M Frame size and I-Line style plug-in connection, weighing 38 lb for straightforward installation in compatible panelboards and switchboards. This unit complies with industry standards for molded case circuit breakers, ensuring dependable performance in demanding environments. Typical applications include main or feeder protection in manufacturing plants, commercial buildings, and heavy industrial facilities.

Key Features & Specifications
  • Manufacturer: Square D
  • Item Subcategory: Molded Case
  • Family: I-Line
  • Type: MA
  • Weight: 38 lb
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: M Frame
  • Voltage Rating: 600V
  • Poles: 3
  • Connection: I-Line Style Plug-In
  • Protection: Thermal Magnetic
  • AIC rating: 30kA@480V
  • Phase: 3
  • Current Rating: 400A
  • Amperage: 400 Amps
  • Mounting Type: I-Line Style Plug-In
  • Interrupt Rating: 30kA @ 480V
  • Series/Frame: MA Frame
  • Trip Unit: Thermal Magnetic
  • Application: Three-Phase (3PH)


Part Number: MA36400CBA