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Square D QOU3401021 - Molded Case Circuit Breaker 40A 240V 3-Pole

Square D
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Square D QOU3401021 is a 3-pole molded case circuit breaker designed for thermal-magnetic overcurrent protection in industrial power distribution systems. It is rated for 40A at 240V AC with a 10kA interrupting capacity, providing long-time and instantaneous trip functions for overload and short-circuit protection. The unit features a bolt-on connection, accepts AWG 14 to AWG 2 aluminum or copper wire, and measures 4.05 in x 3 in x 2.95 in (H x W x D) with a weight of 1.56 lb. This breaker complies with industry standards for 3-phase applications and operates within a temperature range of -13°F to 158°F (-25°C to 70°C). It is suitable for use in commercial and industrial panelboards requiring reliable branch circuit protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal Magnetic
  • Voltage Rating: 240V AC
  • Current Rating: 40A
  • Dimensions: 4.05 in (102.87 mm) x 3 in (76.2 mm) x 2.95 in (74.93 mm) (Height x Width x Depth)
  • Standards: Industry standard for 3-phase applications
  • Applications: Commercial and industrial panelboards
  • Switch Type: Bolt-On
  • Configuration: 3-Pole
  • Coil Voltage Maximum: Not applicable
  • Temp Rating: -13–158 °F (-25–70 °C)
  • Shipping Dimensions: Not specified
  • Phase: 3
  • Voltage: 240V
  • Amperage: 40A
  • AIC rating: 10kA@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: Molded Case
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Metal Type: Not specified
  • Panel Style: Not specified
  • Bus Type: Not specified
  • Fuse Class: Not applicable
  • Insulation Temperature: Not specified
  • Inductance: Not applicable
  • Impedance: Not applicable
  • Barrels: Not applicable
  • Class Rating: Not applicable
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: Not applicable
  • Clas: Not applicable
  • Mounting: Bolt-On
  • Hz: 50/60 Hz (assumed)
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not specified
  • CPT: Not applicable
  • Full Load Amps: Not specified
  • Dist Voltage: Not applicable
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: Not applicable
  • Full Load Amp Minimum: Not applicable
  • Enclosure: Not specified
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: AWG 14...AWG 2 aluminium/copper
  • Amperage Maximum: 40A
  • Amperage Minimum: Not applicable
  • Nema Rating: Not specified
  • Switch Style: Not applicable
  • Wire Size: AWG 14...AWG 2 aluminium/copper
  • Certification: Not specified
  • Circuit Breaker Mounting Style: Bolt-On
  • Terminal Connection: Bolt-On
  • Frequency Rating: 50/60 Hz (assumed)
  • Phase Connection: 3-Phase
  • Standards: Industry standard
  • Compatible Frames: Not specified
  • Installation Type: Panelboard
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: Not specified
  • Current Rating: 40A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not applicable
  • 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: 70 °C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 078590151862
  • GTIN: 00785901518624