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Square D QO3701021 - 3-Pole 70A Circuit Breaker (10kA AIC, 240V)

Square D
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Square D QO3701021 is a molded case circuit breaker designed for providing reliable overcurrent and short-circuit protection in three-phase electrical systems. It features a 70A current rating and a 240V AC voltage rating, housed within a compact 100A frame with dimensions of 79 mm H x 76 mm W x 74 mm D and a weight of 1.37 lb. The breaker utilizes a thermal-magnetic trip mechanism for long-time and instantaneous (LI) protection and is constructed for plug-in connection with lug terminals, accepting wire sizes from 2 to 8 AWG. It is CSA Certified and UL Listed, meeting industry standards with an interrupting capacity of 10kA at 240V AC. This shunt trip breaker is typically applied in commercial and industrial settings for branch circuit protection within compatible QO load centers and NQ panelboards.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Shunt Trip, Thermal-Magnetic Protection
  • Voltage Rating: 240V AC
  • Current Rating: 70A
  • Dimensions: 3.1 in H (79 mm) x 3.0 in W (76 mm) x 2.9 in D (74 mm)
  • Standards: CSA Certified, UL Listed
  • Applications: Branch circuit protection in QO Load Centers and NQ Panelboards
  • Switch Type: Circuit Breaker
  • Configuration: Plug-In
  • Poles: 3
  • Phase: 3
  • AIC Rating: 10kA @ 240V AC
  • Connection: Plug-In
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: 100A/QO
  • Trip Type: Thermal Magnetic
  • Panel Type: QO Load Centers and NQ Panelboards
  • Breaker Type: Shunt Trip
  • MCM Size: Min. Wire Size 8 AWG, Max. Wire Size 2 AWG
  • Terminal Connection: Lug
  • Certification: UL Listed
  • Family: QO Series
  • Weight: 1.37 lb


Product Identification
  • UPC: 785901030577
  • GTIN: 00785901030577