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Siemens MQJ390 - Molded Case 90A 3-Pole 240V

Siemens
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Siemens MQJ390 Circuit Breaker is a 3-pole molded case circuit breaker designed for thermal magnetic protection with long-time and instantaneous (LI) trip functions. It is rated for 240V AC, 90A continuous current, and provides a 10kA interrupting capacity at 240V AC for overcurrent protection in three-phase systems. The unit features a bolt-on connection type, weighs 4 lb, and is part of the MQJ Series with an MQ frame design for robust industrial construction. It complies with applicable UL and NEMA standards for molded case circuit breakers. Typical applications include branch circuit protection in commercial and industrial power distribution panels, motor control centers, and switchboards requiring reliable overload and short-circuit interruption.

Key Features & Specifications
  • Type: Molded Case, Thermal Magnetic, LI (Long-Time and Instantaneous)
  • Voltage Rating: 240V AC
  • Current Rating: 90A
  • Poles: 3
  • Phase: 3
  • AIC Rating: 10kA@240V
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Family: MQJ Series
  • Type: MQ
  • Weight: 4 lb


Product Identification
  • UPC: 040892531138
  • GTIN: 00040892531138