THQB1120ST1 - 20Amp Circuit Breaker

THQB1120ST1 - 20 Amp Circuit Breaker

The THQB1120ST1 is a 20-amp, 1-pole THQB circuit breaker with a factory-installed 120VAC shunt trip. It is commonly used in panelboard applications where a breaker needs to provide standard overcurrent protection and be capable of remote tripping via an external control signal. The bolt-on mounting style provides a secure connection inside compatible Q-Line panelboards, making this breaker a good fit for commercial and industrial electrical systems. The built-in shunt trip is often used with emergency-stop circuits, fire alarm systems, access control systems, and other applications where power must be disconnected from a remote location. With a 10kA interrupting rating at 120VAC, the THQB1120ST1 helps you to protect branch circuits from overloads and short-circuit conditions. It is also HACR rated, allowing it to be used in many HVAC and refrigeration applications.

Key Features and Benefits

• 20 Amp rating
• Single-pole design
• Factory-installed 120VAC shunt trip
• Bolt-on mounting configuration
• 10kA interrupting capacity at 120VAC
• HACR rated
• Molded case construction
• Compatible with Q-Line panelboard applications
• Allows remote tripping when connected to a control circuit
  

Technical Specifications

• Part Number: THQB1120ST1
  
• Type: THQB
  
• Poles: 1
  
• Amperage: 20A
  
• Voltage Rating: 120VAC
  
• Interrupting Capacity: 10kA @ 120VAC
  
• Shunt Trip Voltage: 120VAC
  
• Mounting Style: Bolt-On
  
• Construction: Molded Case Circuit Breaker
  
• HACR Rated: Yes
  
• Dimensions:
  • Height: 3.5 in.
  • Width: 2.0 in.
  • Depth: 2.81 in.

Material Compliance and Certifications

• HACR Rated: HACR rated
• Construction: Molded case circuit breaker construction
• Application: Suitable for use in compatible electrical distribution equipment
• Manufacturing Standards: Manufactured to applicable industry requirements for circuit protection devices
  

Where It Works Best

• You'll typically find the THQB1120ST1 in commercial buildings, schools, office facilities, manufacturing environments, and HVAC installations. It's especially useful when a breaker needs to be tripped remotely, whether through a fire alarm interface, an emergency shutdown station, a building automation system, or an equipment control panel.