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Siemens JL63B300 - 300A 3-Pole 600V Thermal Magnetic Breaker

Siemens
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Siemens JL63B300 Circuit Breaker - 300A, 3-Pole, 600V Thermal Magnetic Molded Case The Siemens JL63B300 is a 3-pole molded case circuit breaker from the JL Series, designed to provide LI (Long-Time and Instantaneous) protection for industrial power distribution systems. This thermal magnetic breaker is rated for 600V AC, 300A continuous current, and delivers a 35kA interrupting capacity at 480V, ensuring robust fault clearance in high-fault environments. Weighing 24 lb, it features a bolt-on connection type for secure panel mounting and is constructed with a compact molded case frame suitable for 3-phase applications. The breaker complies with industry standards for overcurrent protection and is engineered for use in switchboards, panelboards, and motor control centers requiring reliable thermal magnetic trip coordination.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal Magnetic, LI (Long-Time and Instantaneous) Trip
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Poles: 3
  • Phase: 3
  • AIC Rating: 35kA @ 480V
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Weight: 24 lb
  • Family: JL Series
  • Item Subcategory: Molded Case
  • Type: JL


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