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Square D QO2DTI - Interlock Accessory 1-Pole (QO Series)

Square D
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Square D QO2DTI is a QO series circuit breaker interlock accessory designed to provide mechanical interlocking between two adjacent QO branch circuit breakers for generator or critical load applications. This single-pole interlock section operates at standard residential voltage ratings and is constructed with a compact depth of 3.09 inches (78.49 mm) and width of 4.44 inches (112.78 mm), weighing 0.05 lb. It is manufactured by Schneider Electric in the United States and complies with UL and CSA standards for safety and reliability. This interlock is typically used in residential and light commercial load centers to prevent simultaneous connection of utility and backup power sources.

Key Features & Specifications
  • Type: Mechanical interlock for QO circuit breakers
  • Voltage Rating: 120/240 VAC
  • Current Rating: Not applicable (accessory)
  • Dimensions: Depth 3.09 in (78.49 mm) x Width 4.44 in (112.78 mm)
  • Standards: UL, CSA
  • Applications: Generator interlock, critical load isolation
  • Switch Type: Mechanical interlock
  • Configuration: Single-pole
  • Poles: 1
  • Section: Interlocks
  • Circuit Breaker Mounting Style: Plug-on
  • Terminal Connection: None (mechanical only)
  • Frequency Rating: 60 Hz
  • Phase: Single-phase
  • Phase Connection: Line-to-neutral
  • Standards: UL 489, CSA C22.2
  • Compatible Frames: QO series
  • Installation Type: Plug-on
  • Item QTY: 1
  • Breaker Frame: QO
  • Current Rating: Not applicable
  • Operating Temperature Maximum Celsius: 40°C
  • Enclosure: Open type
  • Wire Size: Not applicable
  • Certification: UL listed
  • Nema Rating: 1
  • Metal Type: Steel
  • Mounting: Plug-on
  • Hz: 60
  • Horse Power: Not applicable
  • Aux Contacts: None
  • CPT: None
  • Full Load Amps: Not applicable
  • Dist Voltage: 120/240 VAC
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: Not applicable
  • Full Load Amp Minimum: Not applicable
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Coil Voltage Maximum: Not applicable
  • Wire: Not applicable
  • Amperage Maximum: Not applicable
  • Amperage Minimum: Not applicable
  • Switch Style: Mechanical interlock
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Panel Style: QO load center
  • Bus Type: Tin-plated copper
  • Fuse Class: Not applicable
  • Insulation Temperature: 105°C
  • 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
  • Coil Material: Not applicable
  • 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
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 78590152045
  • GTIN: 00785901520450