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Square D QOU1401021 - Molded Case Circuit Breaker 40A 1-Pole

Square D
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Square D QOU1401021 is a molded case circuit breaker designed for providing reliable overcurrent protection in industrial and commercial electrical systems. It features a 40A current rating and a 120V AC voltage rating, with a 10kA interrupting capacity at that voltage for robust short-circuit protection. The breaker's compact, bolt-on design measures 102.87 mm H x 38.1 mm W x 74.93 mm D and utilizes a thermal-magnetic trip unit with long-time and instantaneous (LI) functions for coordinated protection. It is certified to UL, IEC, and CSA standards and operates within a temperature range of -25 to 70 °C. This single-pole breaker is typically applied in panelboards and switchboards for branch circuit protection, compatible with conductors from AWG 14 to AWG 2.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal-Magnetic Protection, Bolt-On Connection
  • Voltage Rating: 120V AC
  • Current Rating: 40A
  • Dimensions: 4.05 in (102.87 mm) H x 1.5 in (38.1 mm) W x 2.95 in (74.93 mm) D
  • Standards: UL Listed, IEC, CSA
  • Applications: Industrial & Commercial Panelboards, Branch Circuit Protection
  • Switch Type: Circuit Breaker
  • Configuration: Single Unit
  • Temp Rating: -13–158 °F (-25–70 °C)
  • Shipping Dimensions: Unit Dimensions Apply
  • Phase: 1
  • Voltage: 120V
  • Amperage: 40A
  • AIC Rating: 10kA @ 120V
  • Connection: Bolt-On
  • Poles: 1
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous Trip
  • Frame Size: QOU Series
  • Trip Type: Thermal-Magnetic
  • Wire Size: AWG 14...AWG 2 aluminium/copper
  • Certification: UL listed - IEC - CSA


Product Identification
  • GTIN: 00785901678571