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Square D Q1B390 - Molded Case 90A 3-Pole 240V

Square D
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Square D Q1B390 is a 3-pole molded case circuit breaker designed for overcurrent protection in industrial power distribution systems. It operates at 240V with a 90A current rating and provides LI (Long-Time and Instantaneous) protection functions through a thermal magnetic trip mechanism. The unit features a bolt-on connection style, weighs 2 lb, and is part of the Q1B Series with a 10kA interrupting capacity at 240V. This breaker complies with industry standards for three-phase applications, ensuring reliable performance in panelboards and switchboards. Typical uses include protecting branch circuits in commercial and light industrial facilities where compact, high-density mounting is required.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal Magnetic
  • Voltage Rating: 240V
  • Current Rating: 90A
  • Poles: 3
  • Phase: 3
  • AIC Rating: 10kA@240V
  • Connection: Bolt-On
  • Protection: LI - Long-Time and Instantaneous
  • Functions: Overcurrent protection with thermal magnetic trip
  • Weight: 2 lb
  • Family: Q1B Series
  • Item Subcategory: Molded Case


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