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Siemens JJ3B300 - Molded Case Circuit Breaker 300A 600V

Siemens
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Siemens JJ3B300 is a 3-pole molded case circuit breaker designed for overcurrent protection in industrial and commercial electrical systems. It is rated for 300 amps at 600V AC and features a thermal magnetic trip unit with LI (Long-Time and Instantaneous) protection functions. The bolt-on connection type and JJ frame construction support a weight of 22 lb, with a 25kA interrupting capacity at 480V AC for 3-phase applications. This breaker complies with industry safety certifications for use in panelboards and switchboards. Typical applications include distribution and branch circuit protection in manufacturing facilities, commercial buildings, and utility infrastructure.

Key Features & Specifications
  • Type: Molded Case
  • Family: JJ Frame
  • Poles: 3
  • Current Rating: 300 Amp
  • Voltage Rating: 600 Volt AC
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Connection: Bolt-On
  • AIC Rating: 25kA at 480V
  • Phase: 3
  • Weight: 22 lb
  • Terminal Type: Load Side Lug