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Square D QO120M125RB - Miniature Circuit Breaker 20A 1-Pole

United Fuses
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Square D QO120M125RB is a miniature circuit breaker designed for overload and short-circuit protection in residential and commercial electrical systems. It is rated for 120/240V AC with a current rating of 20A and a 125A frame, featuring a 1-pole configuration with a thermal-magnetic trip mechanism for reliable overcurrent protection. The breaker weighs 5.19 lb and is constructed with a compact plug-on mounting style for easy installation in QO load centers. It complies with UL 489 standards, ensuring safe operation in branch circuit applications. This breaker is commonly used in lighting, appliance, and general-purpose circuits in panelboards.

Key Features & Specifications
  • Type: Miniature circuit breaker, thermal-magnetic, plug-on
  • Voltage Rating: 120/240V AC
  • Current Rating: 20A
  • Dimensions: Not specified
  • Standards: UL 489
  • Applications: Branch circuit protection in residential and commercial panels
  • Switch Type: Toggle
  • Configuration: 1-pole
  • Coil Voltage Maximum: Not applicable
  • Temp Rating: Not specified
  • Shipping Dimensions: Not specified
  • Phase: 1
  • Voltage: 120/240V AC
  • Amperage: 20A
  • AIC rating: Not specified
  • Connection: Plug-on
  • Poles: 1
  • Protection: Overload and short-circuit
  • Functions: Circuit protection
  • Frame Size: 125A
  • Trip Type: Thermal-magnetic
  • Panel Type: QO
  • Breaker Type: Miniature
  • 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: Plug-on
  • Hz: 60
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not applicable
  • 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 applicable
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not specified
  • Amperage Maximum: 20A
  • Amperage Minimum: Not applicable
  • Nema Rating: Not specified
  • Switch Style: Toggle
  • Wire Size: Not specified
  • Certification: UL
  • Circuit Breaker Mounting Style: Plug-on
  • Terminal Connection: Not specified
  • Frequency Rating: 60 Hz
  • Phase Connection: Single-phase
  • Standards: UL 489
  • Compatible Frames: QO
  • Installation Type: Plug-on
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: 125A
  • Current Rating: 20A
  • 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: Not specified
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: Not available
  • GTIN: Not available