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Square D Q1B3901021 - Molded Case 90A 3-Pole 240V

Square D
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Square D Q1B3901021 is a 3-pole molded case circuit breaker designed for overcurrent protection in industrial power distribution systems. This thermal magnetic breaker is rated for 90A at 240V AC with a 10kA interrupting capacity at 240V, providing LI (Long-Time and Instantaneous) protection functions. The unit features a bolt-on connection style, weighs 2 lb, and is part of the Q1B Series with a 3-phase configuration. It complies with industry standards for molded case circuit breakers and is suitable for protecting branch circuits and feeders in commercial and industrial applications.

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