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Square D QO2255219 - Miniature Circuit Breaker 25A 2-Pole

Square D
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Square D QO2255219 is a 2-pole QO-series miniature circuit breaker designed for overload and short-circuit protection in residential and commercial load centers. It is rated for 120/240 VAC at 50/60 Hz with a current rating of 25 amps and an interrupting capacity of 10 kAIC at 240 VAC. The breaker features a compact plug-on mounting design with a thermal-magnetic trip mechanism, housed in a thermoplastic case measuring 3.0 in (76 mm) in height, 1.5 in (38 mm) in width, and 2.9 in (74 mm) in depth, weighing 0.27 lb. It complies with UL 489 and CSA C22.2 No. 5 standards, ensuring reliable performance in branch circuit protection for lighting, appliance, and general-purpose loads. Typical applications include panelboards, subpanels, and distribution boards in industrial and commercial facilities.

Key Features & Specifications
  • Type: QO-series miniature circuit breaker, thermal-magnetic trip, plug-on mounting
  • Voltage Rating: 120/240 VAC
  • Current Rating: 25 A
  • Dimensions: 3.0 in (76 mm) x 1.5 in (38 mm) x 2.9 in (74 mm) (H x W x D)
  • Standards: UL 489, CSA C22.2 No. 5
  • Applications: Branch circuit protection in residential and 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 1.5 in x 2.9 in
  • Phase: Single-phase
  • Voltage: 120/240 VAC
  • Amperage: 25 A
  • AIC rating: 10 kAIC at 240 VAC
  • Connection: Plug-on
  • Poles: 2
  • Protection: Overload and short-circuit
  • Functions: Thermal-magnetic trip
  • Frame Size: QO
  • Trip Type: Fixed thermal-magnetic
  • Panel Type: QO load centers
  • Breaker Type: Miniature circuit breaker
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Metal Type: Copper alloy contacts
  • Panel Style: Plug-on
  • Bus Type: Tin-plated 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: Not applicable
  • Clas: Not applicable
  • Mounting: Plug-on
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not included
  • CPT: Not applicable
  • Full Load Amps: 25 A
  • Dist Voltage: 240 VAC
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 25 A
  • Full Load Amp Minimum: 25 A
  • Enclosure: Open (no enclosure)
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not applicable
  • Amperage Maximum: 25 A
  • Amperage Minimum: 25 A
  • Nema Rating: Not applicable
  • Switch Style: Toggle
  • Wire Size: 14 AWG to 8 AWG
  • Certification: UL, CSA
  • Circuit Breaker Mounting Style: Plug-on
  • Terminal Connection: Screw-type
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Single-phase
  • Standards: UL 489, CSA C22.2 No. 5
  • Compatible Frames: QO load centers
  • Installation Type: Plug-on
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: QO
  • Current Rating: 25 A
  • 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: 078590114254
  • GTIN: 0078590114254