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Siemens KM3B400 - Molded Case Circuit Breaker 400A 600V 3P

Siemens
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Siemens KM3B400 is a molded case circuit breaker designed for providing reliable overcurrent and short-circuit protection in three-phase industrial power distribution systems. It features a 400A continuous current rating and a 600V AC voltage rating, housed within a robust 56 lb K-frame construction with a bolt-on connection for secure installation. This thermal-magnetic breaker complies with relevant industry standards for electrical safety and performance, offering long-time and instantaneous (LI) trip functions. Its 50kA interrupting capacity at 480V AC makes it suitable for protecting feeders, mains, and large branch circuits in manufacturing plants, data centers, and commercial facilities.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal-Magnetic Protection, K-Frame
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Poles: 3
  • Phase: 3
  • Connection: Bolt-On
  • AIC Rating: 50kA @ 480V AC
  • Trip Functions: LI (Long-Time and Instantaneous)
  • Frame Family: K Frame
  • Approximate Weight: 56 lb


Product Identification
  • Manufacturer Part Number: KM3B400