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JJ3B400

Siemens
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Siemens JJ3B400 is a 3-pole molded case circuit breaker from the JJ Frame family, designed for overcurrent protection in industrial and commercial power distribution systems. It employs a thermal magnetic trip unit with LI (Long-Time and Instantaneous) functions, rated at 400A and 600VAC, with an interrupting capacity of 25kA at 480VAC. The unit weighs 22 lb, features a bolt-on connection for secure mounting in switchgear enclosures, and operates on 3-phase systems. This breaker complies with industry standards for reliable circuit protection in demanding electrical environments. It is well-suited for applications requiring robust fault interruption and load management in manufacturing facilities, commercial buildings, and utility infrastructure.

Key Features & Specifications
  • Type: Molded Case
  • Family: JJ Frame
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 600VAC
  • Current Rating: 400A
  • Poles: 3
  • Phase: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC Rating: 25kA @ 480V
  • Weight: 22 lb
  • Frequency: 50/60 Hz


Siemens JJ3B400 - Molded Case Circuit Breaker 400A 600VAC