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Siemens JKL2B400 - Molded Case Circuit Breaker 400A 600V

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Siemens JKL2B400 is a 2-pole molded case circuit breaker from the JKL Series, designed for overcurrent protection in commercial and industrial power distribution systems. It features a thermal-magnetic trip unit with LI (Long-Time and Instantaneous) functions, rated for 600V AC and 400A continuous current at 40°C, with a bolt-on connection for secure installation. The unit weighs 12 lb and is built for single-phase applications, offering a high interrupting capacity of 42kA at 600V for robust circuit protection. It complies with UL 489 and CSA 22.2 No. 5 standards, ensuring reliable performance in demanding environments. Typical applications include panelboards, switchboards, and motor control centers requiring dependable branch circuit protection.

Key Features & Specifications
  • Type: Molded Case
  • Family: JKL Series
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Poles: 2
  • Phase: 1
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • Weight: 12 lb
  • Interrupt Rating: 42kA @ 600V
  • Continuous Current: 400A @ 40°C
  • Standards: UL 489, CSA 22.2 No. 5
  • Application: Commercial, Industrial


Part Number: JKL2B400