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ABB THQB1125ST1 - 1-Pole 25A Thermal-Magnetic 120VAC 10kA Bolt-On

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ABB THQB1125ST1 Circuit Breaker - 1-Pole 25A Thermal-Magnetic 120VAC 10kA Bolt-On The ABB THQB1125ST1 is a 1-pole bolt-on circuit breaker designed for overcurrent protection in industrial and commercial power distribution systems. It provides a 25 amp current rating with a 120 Vac voltage rating and a 10 kA interrupting capacity at 120 Vac. This unit features a thermal-magnetic trip mechanism (LI functions) and accepts wire sizes from 14-8 kcmil for copper or 12-8 kcmil for aluminum. The breaker is built for single-phase applications and complies with UL and CSA standards for panelboard installation. It is commonly used in lighting panels, motor control centers, and general-purpose load centers requiring reliable branch circuit protection.

Key Features & Specifications
  • Type: 1-pole bolt-on circuit breaker with thermal-magnetic trip
  • Voltage Rating: 120 Vac
  • Current Rating: 25 A
  • Dimensions: Standard 1-inch pole width
  • Standards: UL 489, CSA C22.2 No. 5
  • Applications: Branch circuit protection in panelboards, lighting panels, and motor control centers
  • Switch Type: Toggle
  • Configuration: Single-pole
  • Coil Voltage Maximum: Not applicable (thermal-magnetic)
  • Temp Rating: 40°C ambient
  • Shipping Dimensions: 3.5 x 2.5 x 1.5 inches
  • Phase: 1
  • Voltage: 120 Vac
  • Amperage: 25 A
  • AIC rating: 10 kA at 120 Vac
  • Connection: Bolt-on
  • Poles: 1
  • Protection: Overcurrent and short-circuit
  • Functions: LI (Long-time and Instantaneous)
  • Frame Size: THQB
  • Trip Type: Thermal-magnetic
  • Panel Type: Bolt-on panelboards
  • Breaker Type: THQB
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: 14-8 kcmil (Cu), 12-8 kcmil (Al)
  • Metal Type: Copper and aluminum compatible
  • Panel Style: Bolt-on
  • Bus Type: Bolt-on
  • Fuse Class: Not applicable
  • Insulation Temperature: 75°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: Bolt-on
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not included
  • CPT: Not included
  • Full Load Amps: 25 A
  • Dist Voltage: 120 Vac
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 25 A
  • Full Load Amp Minimum: 0 A
  • Enclosure: Open (for panelboard installation)
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: 14-8 kcmil (Cu), 12-8 kcmil (Al)
  • Amperage Maximum: 25 A
  • Amperage Minimum: 0 A
  • Nema Rating: Not applicable
  • Switch Style: Toggle
  • Wire Size: 14-8 kcmil (Cu), 12-8 kcmil (Al)
  • Certification: UL 489, CSA
  • Circuit Breaker Mounting Style: Bolt-on
  • Terminal Connection: Screw-type
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Single-phase
  • Standards: UL 489, CSA C22.2 No. 5
  • Compatible Frames: THQB
  • Installation Type: Panelboard
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: THQB
  • 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: Not available
  • GTIN: Not available