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Siemens J3B150 - Molded Case Circuit Breaker 150A 600V 3-Pole

Siemens
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Siemens J3B150 is a J-Frame molded case circuit breaker designed for overcurrent protection in three-phase power distribution systems. This 150A, 600V, three-pole unit utilizes a thermal magnetic trip mechanism with LI (Long-Time and Instantaneous) functions to safeguard electrical circuits from sustained overloads and short circuits. The breaker features a bolt-on connection for secure panel mounting and weighs 17 lb, constructed within a compact J-Frame housing. It is UL Listed, meeting industry standards for residential and commercial electrical installations. Typical applications include branch circuit protection in industrial control panels, lighting panels, and distribution boards requiring reliable 600V AC protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker
  • Family: J Frame
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 600V
  • Current Rating: 150A
  • Poles: 3
  • Phase: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • Weight: 17 lb
  • Interrupt Rating: Typically 10kA to 35kA AIC depending on series
  • Certifications: UL Listed