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Siemens JJ2B400 - Molded Case Circuit Breaker 400A 600V

Siemens
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Siemens JJ2B400 is a molded case circuit breaker designed for overcurrent protection and control in industrial and commercial power distribution systems. This 2-pole, 400A unit operates at 600V AC and provides LI (Long-Time and Instantaneous) trip functions through its thermal-magnetic protection mechanism. The bolt-on breaker weighs 22 lb and features a compact JJ Frame construction suitable for panel mounting in demanding environments. It delivers an interrupting capacity of 25kA at 480V, ensuring reliable fault clearance in single-phase applications. Typical applications include branch circuit protection, feeder protection, and motor control centers requiring robust overcurrent protection.

Key Features & Specifications
  • Type: Molded Case
  • Family: JJ Frame
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 600V
  • Current Rating: 400A
  • Poles: 2
  • Phase: 1
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 25kA@480V
  • Weight: 22 lb