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Siemens JJ63B300 - Molded Case Circuit Breaker 300A 600V 3P

Siemens
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Siemens JJ63B300 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 300A continuous current rating and a 600V AC voltage rating, with a robust thermal-magnetic trip unit offering long-time and instantaneous (LI) protection functions. The breaker is constructed with a three-pole, bolt-on connection within the durable JJ frame, weighing 22 lb, and is certified to UL and CSA standards for safety and interoperability. This compliance ensures suitability for integration into industrial control panels and switchgear, where it provides a 25kA interrupting capacity at 480V AC to safeguard electrical equipment.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, JJ Frame, Thermal-Magnetic Protection
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Poles: 3
  • Connection: Bolt-On
  • Protection Functions: Long-Time and Instantaneous (LI)
  • AIC Rating: 25kA @ 480V AC
  • Phase: 3
  • Certification: UL Listed, CSA Certified
  • Weight: 22 lb
  • Frame: JJ