THQL1120ST1 - 20Amp Circuit Breaker

THQL1120ST1 - 20 Amp Circuit Breaker

The THQL1120ST1 is a 20-amp, 1-pole circuit breaker from the THQL Q-Line family, built for branch circuit protection in 120VAC electrical systems. What sets this model apart is its factory-installed 120VAC shunt trip, allowing the breaker to be tripped remotely when connected to an external control circuit. This feature is commonly used in emergency power shutdown systems, safety controls, building automation systems, and other applications where remote disconnection is required.

With a 10kA interrupting rating at 120VAC, the THQL1120ST1 helps protect wiring and connected equipment from overloads and short-circuit conditions. The plug-on mounting design allows for quick installation in compatible Q-Line load centers and panelboards. Its compact footprint also makes it a practical choice when panel space is limited. The breaker is HACR rated, making it suitable for heating, ventilation, air conditioning, and refrigeration equipment installations.

Whether you're replacing an existing breaker or maintaining a commercial electrical system, the THQL1120ST1 offers a dependable combination of overcurrent protection and remote trip capability in a single device.

Key Features and Benefits

• 20 Amp Current Rating: Provides branch circuit protection for applications requiring a 20-amp breaker.
• Single-Pole Configuration: Designed for use in 120VAC electrical systems requiring single-pole protection.
• 120VAC Shunt Trip: Allows remote breaker operation when connected to an external control circuit, making it suitable for emergency shutdown and automation applications.
• 10kA Interrupting Capacity: Helps protect wiring and equipment from overloads and short-circuit conditions at 120VAC.
• Plug-On Mounting Design: Enables quick installation in compatible Q-Line load centers and panelboards.
• THQL Q-Line Series Construction: Built for use with compatible Q-Line electrical distribution equipment.
• Thermal-Magnetic Overcurrent Protection: Provides protection against overloads and short circuits.
• HACR Rated: Suitable for heating, ventilation, air conditioning, and refrigeration equipment installations.
• Compact Size: Helps maximize available panel space where installation space is limited.
• Versatile Application Use: Suitable for commercial, industrial, and HVAC applications.

Technical Specifications

• Part Number: THQL1120ST1
  
• Type: THQL
  
• Series: Q-Line
  
• Poles: 1
  
• Amperage: 20A
  
• Voltage Rating: 120VAC
  
• Interrupting Rating: 10kA @ 120VAC
  
• Shunt Trip Voltage: 120VAC
  
• Mounting Style: Plug-On
  
• HACR Rated: Yes
  
• Dimensions:
  • Height: 3.31 in.
  • Width: 2.00 in.
  • Depth: 2.81 in.

Material Compliance and Certifications

• HACR Rated: Suitable for HVAC and refrigeration equipment applications.
• Molded Case Circuit Breaker Construction: Manufactured as a molded case circuit breaker for use in compatible electrical distribution equipment.
• Compatible Equipment Use: Manufactured for use in compatible Q-Line electrical distribution equipment.
• Thermal-Magnetic Trip Mechanism: Provides overload and short-circuit protection through a thermal-magnetic trip design.
  

Where It Works Best

• The THQL1120ST1 is commonly used in commercial buildings, industrial facilities, HVAC systems, machinery control panels, emergency shutdown systems, and building automation applications. The integrated shunt trip makes it particularly useful anywhere a circuit must be disconnected remotely for safety, operational, or code-compliance reasons.