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Square D QO350EPD - 50A 3-Pole Thermal Magnetic Breaker (120/240V)

Square D
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Square D QO350EPD is a 3-pole molded case circuit breaker designed for overcurrent protection in residential and commercial load centers. This unit is rated for 50A at 120/240VAC with a 10kA interrupting capacity at 120V, employing thermal-magnetic protection with LI (Long Time and Instantaneous) trip functions. The plug-in connection breaker measures 4.1 x 2.2 x 2.9 inches (105 x 57 x 74 mm) and weighs 1.33 lb, accepting wire sizes from AWG 14 to AWG 6 copper or AWG 12 to AWG 4 aluminum. It is UL Listed and operates within a temperature range of -13 to 158 °F (-25 to 70 °C), making it suitable for 3-phase applications in panelboards and load centers requiring reliable branch circuit protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal Magnetic
  • Voltage Rating: 120/240V
  • Current Rating: 50A
  • Dimensions: 4.1 in (105 mm) x 2.2 in (57 mm) x 2.9 in (74 mm) (Height x Width x Depth)
  • Standards: UL Listed
  • Applications: Residential and commercial load centers, 3-phase branch circuit protection
  • Switch Type: Toggle
  • Configuration: 3-Pole
  • Coil Voltage Maximum: Not applicable
  • Temp Rating: -13–158 °F (-25–70 °C)
  • Shipping Dimensions: 4.1 in x 2.2 in x 2.9 in
  • Phase: 3
  • Voltage: 120/240V
  • Amperage: 50A
  • AIC rating: 10kA@120V
  • Connection: Plug-In
  • Poles: 3
  • 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: Not specified
  • Panel Style: QO
  • Bus Type: Plug-on
  • 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: Plug-In
  • Hz: 60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not included
  • CPT: Not included
  • Full Load Amps: 50A
  • Dist Voltage: 120/240V
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 50A
  • Full Load Amp Minimum: Not applicable
  • Enclosure: Open
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Copper or Aluminum
  • Amperage Maximum: 50A
  • Amperage Minimum: Not applicable
  • Nema Rating: Not specified
  • Switch Style: Toggle
  • Wire Size: AWG 12 to AWG 4 Aluminum, AWG 14 to AWG 6 Copper
  • Certification: UL Listed
  • Circuit Breaker Mounting Style: Plug-In
  • Terminal Connection: Plug-In
  • Frequency Rating: 60 Hz
  • Phase Connection: 3-Phase
  • Standards: UL 489
  • Compatible Frames: QO
  • Installation Type: Plug-In
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: QO
  • Current Rating: 50A
  • 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: 785901957126
  • GTIN: 00785901957126