THQL2120ST1 - 20Amp Circuit Breaker

THQL2120ST1 - 20 Amp Circuit Breaker

The THQL2120ST1 is a 20 amp, 2-pole molded case circuit breaker designed to provide dependable overcurrent protection for your residential, commercial, and light industrial electrical systems. As part of the trusted THQL Q-Line series, this breaker features a convenient plug-on design for straightforward installation and secure panelboard connection. Its integrated 120VAC shunt trip functionality allows the breaker to be remotely tripped through an external control signal, making it an excellent choice for emergency shutdown systems, safety interlocks, and automated electrical control applications.

Built to handle 120/240VAC systems with a 10kA interrupting capacity, the THQL2120ST1 helps you protect circuits and connected equipment from damage caused by overloads and short circuits. The breaker is also HACR rated, making it suitable for heating, air conditioning, and refrigeration applications where reliable circuit protection is essential. Combining proven performance, installation convenience, and remote-trip capability, this circuit breaker is a practical solution for a wide range of electrical protection requirements.

Key Features and Benefits

• 20 Amp Rating: Designed to protect branch circuits carrying up to 20 amps.
• 2-Pole Configuration: Provides protection for two energized conductors in 120/240VAC systems.
• Integrated 120VAC Shunt Trip: Enables remote tripping for emergency shutdown and automated control applications.
• THQL Q-Line Design: Compatible with designated Q-Line load centers and panelboards.
• Plug-On Installation: Simplifies installation while providing a secure electrical connection.
• 10kA Interrupting Capacity: Helps safely interrupt fault currents before they can damage equipment.
• HACR Rated: Suitable for heating, air conditioning, and refrigeration equipment applications.
• Molded Case Construction: Built for long-term durability and dependable circuit protection.
  

Technical Specifications

• Part Number: THQL2120ST1
  
• Type: THQL
  
• Circuit Breaker Style: Molded Case Circuit Breaker
  
• Series: Q-Line
  
• Poles: 2
  
• Amperage Rating: 20 Amps
  
• Voltage Rating: 120/240VAC
  
• Interrupting Capacity: 10kA @ 120/240VAC
  
• Shunt Trip Voltage: 120VAC
  
• HACR Rated: Yes
  
• Mounting Style: Plug-On
  
• Dimensions:
  • Height: 3.31 in.
  • Width: 3.00 in.
  • Depth: 2.81 in.

Material Compliance and Certifications

• Industry Standards: The THQL2120ST1 is manufactured to meet applicable industry standards for molded case circuit breakers and is designed for use in systems requiring reliable overcurrent protection and remote-trip functionality.
• Installation Requirements: Always verify local code requirements and equipment compatibility before installation.
  

Where It Works Best

• The THQL2120ST1 is well suited for electrical distribution systems that require both standard circuit protection and remote disconnect capability. Common applications include commercial buildings, industrial control panels, emergency power shutdown systems, HVAC equipment, refrigeration systems, machinery protection circuits, and facilities where remote safety controls are required. Its combination of overcurrent protection and shunt-trip functionality makes it a valuable component in installations where safety, accessibility, and operational control are priorities.