THQL1120DF - 20Amp Dual Function Circuit Breaker

THQL1120DF - 20Amp Dual Function Circuit Breaker

If you’re looking for a straightforward way to add serious protection to a circuit, the THQL1120DF 20 amp dual function breaker does a lot of heavy lifting in a small package. It combines arc fault (AFCI) and ground fault (GFCI) protection, so you’re covering both fire risks and shock hazards without needing two separate breakers.

This model is built for Q-Line panels and installs easily with a plug-in design. Once it’s in place, it’s constantly monitoring the circuit. If it detects an arc fault—something that can lead to electrical fires—or a ground fault that could cause injury, it shuts things down fast. That’s the kind of protection most modern codes are pushing for, especially in living spaces and areas near water.

Another thing worth noting: it’s designed to avoid the constant nuisance tripping that older or lower-quality breakers can run into. So you get protection without the frustration of resetting it all the time. For electricians and homeowners alike, that balance matters.

Key Features and Benefits

• Combines AFCI and GFCI protection in one breaker
• 20 amp, single pole for 120V circuits
• Plug-in style for quick installation in Q-Line panels
• Helps protect against electrical fires and shock hazards
• 22 kAIC interrupting rating for reliable fault handling
• Built to reduce unnecessary tripping
• Supports compliance with current electrical code requirements
  

Technical Specifications

• Catalog Number: THQL1120DF
  
• Amperage: 20A
  
• Voltage: 120 VAC
  
• Poles: 1
  
• Interrupting Rating: 22 kAIC
  
• Trip Function: LI with AFCI/GFCI
  
• Wire Range: #14–8 AWG (Copper/Aluminum)
  
• Mounting: Plug-In
  
• Breaker Type: Q-Line
  

Material Compliance and Certifications

• UL Listed (E471742)
• Meets established safety standards for circuit protection
• Includes environmental product documentation (EPD available)

Where It Works Best

• You’ll typically see this breaker used in areas where both arc fault and ground fault protection are required:
• Bedrooms and living areas
• Kitchens and laundry spaces
• Bathrooms and other moisture-prone locations
• Panel upgrades and remodels
• Light commercial 120V applications