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Siemens THQB1120CHEM - Miniature Circuit Breaker 20A 120/240V AC

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The THQB1120CHEM is a single-pole, 120/240V AC miniature circuit breaker designed for overload and short-circuit protection in Siemens load centers and panelboards. It carries a 20A current rating with a 10kAIC interrupting capacity at 120/240V AC, housed in a compact 1-inch per pole molded case with a thermal-magnetic trip mechanism. This breaker features a plug-in mounting style, copper line and load side connectors, and is UL 489 listed for compliance with North American safety standards. It is commonly used in residential and light commercial electrical distribution systems for branch circuit protection.

Key Features & Specifications
  • Type: Miniature Circuit Breaker, Thermal-Magnetic, Molded Case
  • Voltage Rating: 120/240V AC
  • Current Rating: 20A
  • Dimensions: 1-inch per pole width, 3.0" height, 2.5" depth
  • Standards: UL 489, CSA C22.2 No. 5
  • Applications: Branch circuit protection in load centers and panelboards
  • Switch Type: Toggle
  • Configuration: Single Pole
  • Coil Voltage Maximum: N/A
  • Temp Rating: 40°C ambient
  • Shipping Dimensions: 3.0" x 2.5" x 1.0"
  • Phase: 1
  • Voltage: 120/240V AC
  • Amperage: 20A
  • AIC rating: 10kAIC at 120/240V AC
  • Connection: Plug-in
  • Poles: 1
  • Protection: Overload and Short Circuit
  • Functions: Circuit Interruption
  • Frame Size: 1-inch per pole
  • Trip Type: Thermal-Magnetic
  • Panel Type: Siemens Load Centers
  • Breaker Type: THQB
  • Control Voltage Minimum: N/A
  • Control Voltage Maximum: N/A
  • MCM Size: N/A
  • Metal Type: Copper
  • Panel Style: NEMA 1
  • Bus Type: Tin-Plated Copper
  • Fuse Class: N/A
  • Insulation Temperature: 105°C
  • Inductance: N/A
  • Impedance: N/A
  • Barrels: N/A
  • Class Rating: N/A
  • Diameter: N/A
  • Velocity: N/A
  • Clip Center: N/A
  • Clas: N/A
  • Mounting: Plug-in
  • Hz: 50/60 Hz
  • Coil Material: N/A
  • Horse Power: 1 HP at 120V, 2 HP at 240V
  • Aux Contacts: No
  • CPT: No
  • Full Load Amps: 20A
  • Dist Voltage: 120/240V AC
  • Bucket Size: N/A
  • Bucket Style: N/A
  • Bucket Type: N/A
  • Full Load Amp Maximum: 20A
  • Full Load Amp Minimum: 0A
  • Enclosure: Open
  • Relay Style: N/A
  • Coil Voltage Minimum: N/A
  • Wire: 14 AWG to 8 AWG
  • Amperage Maximum: 20A
  • Amperage Minimum: 0A
  • Nema Rating: NEMA 1
  • Switch Style: Toggle
  • Wire Size: 14 AWG to 8 AWG
  • Certification: UL 489
  • Circuit Breaker Mounting Style: Plug-in
  • Terminal Connection: Copper
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Single Phase
  • Standards: UL 489, CSA
  • Compatible Frames: Siemens Load Centers
  • Installation Type: Plug-in
  • Item QTY: 1
  • Nema Starter Size: N/A
  • Breaker Frame: 1-inch per pole
  • Current Rating: 20A
  • Reverse Standoff Voltage: N/A
  • Watts: N/A
  • Peak Pulse Current: N/A
  • Breakdown Voltage (MIN VBR@IT ) (V): N/A
  • Breakdown Voltage (VBR@IT) (V): N/A
  • Polarity: N/A
  • Operating Temperature Maximum Celsius: 40°C
  • Max Clamp Voltage: N/A
  • On-State Current: N/A
  • Weight: 5.19 lb


Product Identification
  • UPC: 783643000000
  • GTIN: 00783643000000