THQB2150ST1 - 50Amp Circuit Breaker

THQB2150ST1 - 50 Amp Circuit Breaker

The THQB2150ST1 is a 50-amp, 2-pole molded case circuit breaker designed to provide dependable overcurrent protection in your commercial, industrial, and institutional electrical distribution systems. As part of the trusted THQB Q-Line family, this bolt-on circuit breaker offers secure panelboard installation while helping you to protect electrical equipment and branch circuits from damage caused by overloads and short circuits. Featuring a built-in 120VAC shunt trip, the THQB2150ST1 enables remote tripping capability, making it an excellent choice for emergency shutdown systems, fire safety applications, and other installations requiring remote circuit interruption. Its compact design, HACR rating, and reliable performance make it a practical solution for a wide range of power distribution needs.

Key Features and Benefits

• 50 Amp Rating: Designed to protect circuits and connected equipment operating at up to 50 amps.
• 2-Pole Configuration: Suitable for 120/240VAC electrical systems requiring two-pole protection.
• Integrated 120VAC Shunt Trip: Allows remote tripping of the breaker for enhanced safety and control.
• Bolt-On Mounting Design: Provides a secure connection to compatible panelboards, helping reduce movement and improve reliability.
• 10kA Interrupting Capacity: Rated to safely interrupt fault currents up to 10,000 amps at 120/240VAC.
• HACR Rated: Suitable for heating, air conditioning, and refrigeration equipment applications.
• Molded Case Construction: Built for dependable performance and long service life in demanding electrical environments.
• Q-Line Compatibility: Designed for use in compatible Q-Line panelboard systems.

Technical Specifications

• Part Number: THQB2150ST1
  
• Type: THQB
  
• Circuit Breaker Style: Molded Case Circuit Breaker
  
• Mounting: Bolt-On
  
• Poles: 2
  
• Amperage Rating: 50 Amps
  
• Voltage Rating: 120/240VAC
  
• Interrupting Rating: 10kA @ 120/240VAC
  
• Shunt Trip Voltage: 120VAC
  
• HACR Rated: Yes
  
• Product Line: Q-Line
  
• Dimensions:
  • Height: 3.5 in.
  • Width: 3.0 in.
  • Depth: 2.81 in.

Material Compliance and Certifications

• Industry Standards: The THQB2150ST1 is manufactured to meet applicable industry performance and safety standards for molded case circuit breakers.
• HACR Rating: Its HACR rating confirms suitability for use with heating, ventilation, air conditioning, and refrigeration equipment where code-compliant circuit protection is required.
• Application Verification: Always verify local electrical codes, application requirements, and equipment compatibility before installation.
  

Where It Works Best

• The THQB2150ST1 is well-suited for commercial buildings, industrial facilities, educational campuses, healthcare environments, and other electrical distribution systems that require reliable overcurrent protection along with remote tripping functionality. It is particularly effective in applications involving emergency power shutdown systems, fire and life-safety controls, HVAC equipment, refrigeration systems, and panelboard installations where a bolt-on breaker design is preferred. Its combination of circuit protection and shunt trip capability makes it a valuable component in systems where safety, control, and operational continuity are priorities.