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Square D QOB390VH1021 - 90A 3-Pole Molded Case Breaker

Square D
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The Square D QOB390VH1021 is a 3-pole molded case circuit breaker from the QOB Series, designed to provide thermal-magnetic protection for electrical circuits. It is rated for 90A at 120/240VAC with a 22kA interrupting capacity at 240V, utilizing a bolt-on connection and pressure plate terminals for secure installation. This unit measures 3.5 in (89 mm) x 3.0 in (76 mm) x 2.9 in (74 mm) and weighs 1.37 lb, supporting wire sizes from AWG 4 to AWG 2/0 for copper or aluminum conductors. It complies with CSA and UL standards, with UL listing certification, and operates within a temperature range of -13 to 158 °F (-25 to 70 °C). Typical industrial applications include branch circuit protection in panelboards and switchboards requiring reliable overcurrent and short-circuit interruption.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, QOB Series, Thermal Magnetic
  • Voltage Rating: 120/240VAC
  • Current Rating: 90A
  • Dimensions: 3.5 in (89 mm) x 3.0 in (76 mm) x 2.9 in (74 mm) (Height x Width x Depth)
  • Standards: CSA, UL Listed
  • Applications: Branch circuit protection in industrial panelboards and switchboards
  • Switch Type: Not specified
  • Configuration: 3-Pole
  • Coil Voltage Maximum: Not specified
  • Temp Rating: -13 to 158 °F (-25 to 70 °C)
  • Shipping Dimensions: Not specified
  • Phase: 3
  • Voltage: 120/240VAC
  • Amperage: 90A
  • AIC rating: 22kA@240V
  • Connection: Bolt-On
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: Long-Time and Instantaneous Trip
  • Frame Size: Not specified
  • Trip Type: Thermal Magnetic
  • Panel Type: Not specified
  • Breaker Type: QOB
  • Control Voltage Minimum: Not specified
  • Control Voltage Maximum: Not specified
  • MCM Size: Not specified
  • Metal Type: Not specified
  • Panel Style: Not specified
  • Bus Type: Not specified
  • Fuse Class: Not specified
  • Insulation Temperature: Not specified
  • Inductance: Not specified
  • Impedance: Not specified
  • Barrels: Not specified
  • Class Rating: Not specified
  • Diameter: Not specified
  • Velocity: Not specified
  • Clip Center: Not specified
  • Clas: Not specified
  • Mounting: Bolt-On
  • Hz: Not specified
  • Coil Material: Not specified
  • Horse Power: Not specified
  • Aux Contacts: Not specified
  • CPT: Not specified
  • Full Load Amps: Not specified
  • Dist Voltage: Not specified
  • Bucket Size: Not specified
  • Bucket Style: Not specified
  • Bucket Type: Not specified
  • Full Load Amp Maximum: Not specified
  • Full Load Amp Minimum: Not specified
  • Enclosure: Not specified
  • Relay Style: Not specified
  • Coil Voltage Minimum: Not specified
  • Wire: Not specified
  • Amperage Maximum: 90A
  • Amperage Minimum: Not specified
  • Nema Rating: Not specified
  • Switch Style: Not specified
  • Wire Size: AWG 4 to AWG 2/0, Copper/Aluminum
  • Certification: UL Listed
  • Circuit Breaker Mounting Style: Bolt-On
  • Terminal Connection: Pressure Plate
  • Frequency Rating: Not specified
  • Phase Connection: 3-Phase
  • Standards: CSA, UL Listed
  • Compatible Frames: Not specified
  • Installation Type: Bolt-On
  • Item QTY: Not specified
  • Nema Starter Size: Not specified
  • Breaker Frame: Not specified
  • Current Rating: 90A
  • Reverse Standoff Voltage: Not specified
  • Watts: Not specified
  • Peak Pulse Current: Not specified
  • Breakdown Voltage (MIN VBR@IT ) (V): Not specified
  • Breakdown Voltage (VBR@IT) (V): Not specified
  • Polarity: Not specified
  • Operating Temperature Maximum Celsius: 70 °C
  • Max Clamp Voltage: Not specified
  • On-State Current: Not specified


Product Identification
  • UPC: 785901335504
  • GTIN: 00785901335504