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Square D QO3401021 - 3-Pole Shunt Trip Breaker (40A, 240V)

Square D
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Square D QO3401021 is a molded case circuit breaker designed for providing reliable overcurrent protection in three-phase electrical systems. It features a 40A current rating and 240V voltage rating with a 10kA interrupting capacity, housed in a compact 3.0 in x 3.0 in x 2.9 in (76 mm x 76 mm x 74 mm) plug-in unit weighing 1.18 lb. This three-pole shunt trip breaker utilizes thermal-magnetic protection with long-time and instantaneous (LI) trip functions and is constructed for use in QO load centers and NQ panelboards. It complies with major industry standards, being both UL Listed and CSA Certified, ensuring safe operation. Typical applications include protecting feeders and branch circuits in commercial and light industrial facilities.

Key Features & Specifications
  • Type: Molded Case, Shunt Trip, Thermal Magnetic Protection
  • Voltage Rating: 240V AC
  • Current Rating: 40A
  • Dimensions: 3.0 in H x 3.0 in W x 2.9 in D (76 mm x 76 mm x 74 mm)
  • Standards: UL Listed, CSA Certified
  • Applications: Commercial and Light Industrial Feeder/Branch Circuit Protection
  • Switch Type: Circuit Breaker
  • Configuration: Plug-In
  • Phase: 3
  • AIC rating: 10kA @ 240V
  • Connection: Plug-In
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: Long-Time and Instantaneous (LI)
  • Frame Size: 100A/QO
  • Panel Type: QO Load Centers and NQ Panelboards
  • Breaker Type: Shunt Trip
  • MCM Size: Min. 8 AWG, Max. 2 AWG
  • Terminal Connection: Lug
  • Weight: 1.18 lb


Product Identification
  • UPC: 785901494126
  • GTIN: 00785901494126