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Siemens JK3B300 - Molded Case 300A 3-Pole Thermal Magnetic (600V AC)

Siemens
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Siemens JK3B300 Circuit Breaker - Molded Case 300A 3-Pole Thermal Magnetic (600V AC) The Siemens JK3B300 is a 3-pole molded case circuit breaker from the JK Frame family, designed to provide overcurrent protection through thermal magnetic operation with long-time and instantaneous (LI) trip functions. Rated for 600V AC and 300A, this bolt-on breaker delivers reliable protection for 3-phase industrial power distribution systems. Weighing 16 lb, its compact molded case construction ensures robust performance in demanding environments while maintaining compliance with industry standards for electrical safety. This breaker is typically applied in panelboards, switchboards, and motor control centers requiring precise coordination of overload and short-circuit protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Poles: 3
  • Phase: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Family: JK Frame
  • Weight: 16 lb
  • Standards: UL 489, CSA C22.2 No. 5
  • Applications: Industrial panelboards, switchboards, motor control centers


Product Identification
  • UPC: 783643000000
  • GTIN: 00783643000000