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Siemens JJ2B300 - Molded Case 300A 600V 2-Pole Breaker

Siemens
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The Siemens JJ2B300 is a 2-pole, 300A molded case circuit breaker from the JJ Frame family, designed for overcurrent protection in industrial power distribution systems. It operates at a maximum voltage rating of 600V with a 25kA interrupting capacity at 480V, utilizing thermal magnetic protection with LI (Long-Time and Instantaneous) trip functions. The unit features a bolt-on connection, weighs 22 lb, and is configured for single-phase applications. This breaker complies with industry standards for molded case circuit breakers, ensuring reliable performance in demanding environments. Typical applications include feeder protection, panelboard main disconnects, and branch circuit protection in commercial and industrial facilities.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, JJ Frame, Thermal Magnetic
  • Voltage Rating: 600V
  • Current Rating: 300A
  • Poles: 2
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 25kA@480V
  • Phase: 1
  • Functions: LI - Long-Time and Instantaneous
  • Weight: 22 lb