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Square D QO21001021 - Shunt Trip Breaker 100A 2-Pole

Square D
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Square D QO21001021 is a molded case circuit breaker designed for providing reliable overcurrent protection in single-phase electrical systems. It features a 100A current rating and a 120/240V voltage rating, housed within a compact 3.5 in (89 mm) x 2.2 in (57 mm) x 2.9 in (74 mm) frame constructed for durability. This CSA Certified and UL Listed device utilizes a thermal-magnetic trip mechanism with long-time and instantaneous (LI) functions for consistent protection. It is engineered for plug-in installation in QO load centers and NQ panelboards, making it suitable for a range of commercial and light industrial applications requiring a 10kA interrupting capacity at 240V.

Key Features & Specifications
  • Type: Molded Case, Shunt Trip, Thermal Magnetic Protection with LI (Long-Time and Instantaneous) Functions
  • Voltage Rating: 120/240V AC
  • Current Rating: 100A
  • Dimensions: 3.5 in H x 2.2 in W x 2.9 in D (89 mm x 57 mm x 74 mm)
  • Weight: 0.98 lb
  • Standards: CSA Certified, UL Listed
  • Applications: Commercial and Light Industrial Electrical Distribution
  • Phase: 1
  • Poles: 2
  • AIC Rating: 10kA @ 240V
  • Connection: Plug-In, Lug Terminal
  • Frame Size: 100A/QO
  • Panel Type: QO Load Centers and NQ Panelboards
  • Wire Size: AWG 4 to AWG 2/0 (Copper or Aluminum), MCM Size 8 AWG to 2 AWG
  • Temp Rating: -25°C to 70°C (-13°F to 158°F)
  • Certification: UL Listed


Product Identification
  • UPC: 785901030539
  • GTIN: 00785901030539