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Square D QO320SWN1021 - 20A 2-Pole Molded Case Breaker 240V

Square D
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The Square D QO320SWN1021 is a 2-pole, 20A molded case circuit breaker from the QO Series, designed to provide primary overload and short-circuit protection for electrical systems. It operates at a voltage rating of 240V with a 10kA interrupting capacity at 240V, utilizing a thermal magnetic protection mechanism for LI (Long-Time and Instantaneous) functions. This plug-in breaker measures 3.0 in (76 mm) in height, width, and depth, weighing 0.86 lb, and features a QO-SW type construction for single-phase applications. It complies with industry standards for molded case circuit breakers, ensuring reliable performance in residential and light commercial load centers. Typical applications include branch circuit protection in Square D QO panelboards.

Key Features & Specifications
  • Type: QO-SW Molded Case Circuit Breaker, Thermal Magnetic
  • Voltage Rating: 240V
  • Current Rating: 20A
  • Dimensions: 3.0 in (76 mm) x 3.0 in (76 mm) x 2.9 in (74 mm) (Height x Width x Depth)
  • Standards: UL Listed, CSA Certified
  • Applications: Branch circuit protection in residential and light commercial load centers
  • Switch Type: Toggle
  • Configuration: 2-Pole
  • Coil Voltage Maximum: Not applicable (thermal magnetic)
  • Temp Rating: 40°C ambient
  • Shipping Dimensions: 3.0 in x 3.0 in x 2.9 in
  • Phase: 1
  • Voltage: 240V
  • Amperage: 20A
  • AIC rating: 10kA@240V
  • Connection: Plug-In
  • Poles: 2
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: QO
  • Trip Type: Thermal Magnetic
  • Panel Type: QO Load Centers
  • Breaker Type: Molded Case
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Metal Type: Copper alloy
  • Panel Style: Plug-on
  • Bus Type: Tin-plated aluminum or copper
  • Fuse Class: Not applicable
  • Insulation Temperature: 105°C
  • Inductance: Not specified
  • Impedance: Not specified
  • Barrels: Not applicable
  • Class Rating: Not applicable
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: 1.0 in
  • Clas: Not applicable
  • Mounting: Plug-in
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not included
  • CPT: Not included
  • Full Load Amps: 20A
  • Dist Voltage: 240V
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 20A
  • Full Load Amp Minimum: 20A
  • Enclosure: Open style
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not applicable
  • Amperage Maximum: 20A
  • Amperage Minimum: 20A
  • Nema Rating: Not applicable
  • Switch Style: Toggle
  • Wire Size: #14-8 AWG
  • Certification: UL 489, CSA C22.2
  • Circuit Breaker Mounting Style: Plug-in
  • Terminal Connection: Screw clamp
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Single-phase
  • Standards: UL 489, CSA C22.2 No. 5
  • Compatible Frames: QO
  • Installation Type: Plug-in
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: QO
  • Current Rating: 20A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not specified
  • Peak Pulse Current: Not applicable
  • Breakdown Voltage (MIN VBR@IT ) (V): Not applicable
  • Breakdown Voltage (VBR@IT) (V): Not applicable
  • Polarity: Not applicable
  • Operating Temperature Maximum Celsius: 40°C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 785901890123
  • GTIN: 00785901890123