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Square D Q1B340 - Molded Case Circuit Breaker 40A 3-Pole

United Fuses
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Square D Q1B340 is a three-pole molded case circuit breaker from the Q1B Series, designed to provide LI (Long-Time and Instantaneous) protection for electrical systems. It is rated for 40A at 240V with a 10kA interrupting capacity at 240V, utilizing thermal magnetic protection for reliable overcurrent response. The unit weighs 1 lb and features a bolt-on mounting style for secure installation in compatible panels. This breaker is suitable for three-phase industrial applications requiring dependable circuit protection.

Key Features & Specifications
  • Type: Q1B
  • Functions: LI - Long-Time and Instantaneous
  • Voltage Rating: 240V
  • Current Rating: 40A
  • Poles: 3
  • Phase: 3
  • Protection: Thermal Magnetic
  • AIC rating: 10kA@240V
  • Weight: 1 lb
  • Mounting Type: Bolt-On
  • Series/Frame: Q1B, 100A Frame


Part Number: Q1B340