QBA221251 - 125 Amp Circuit Breaker

QBA221251 - 125 Amp Circuit Breaker

The QBA221251 circuit breaker is a 2-pole, 125 amp molded case circuit breaker designed for use in I-Line panelboard systems utilizing the PowerPact Q-Frame design. Rated at 10kA A.I.C. at 240VAC, this thermal magnetic breaker provides dependable overcurrent and short-circuit protection for commercial and industrial distribution systems. Built for consistent operation and long service life, the QBA221251 is engineered for proper form, fit, and function in compatible legacy electrical systems where QBA frame breakers are specified. Its plug-on I-Line mounting configuration allows for secure installation within approved panelboards, helping maintain system integrity and electrical protection standards.

Designed for A-B phase applications, this breaker delivers reliable interruption performance while supporting code-compliant installations in accordance with applicable industry standards. Whether replacing an existing QBA frame breaker or maintaining installed equipment, the QBA221251 offers the correct ratings and configuration to match system requirements.

Key Features and Benefits

• 125 Amp Rating: Suitable for branch circuit and feeder protection where 125A capacity is required.
• 2-Pole Configuration: Provides protection across two phases (A-B phase).
• 10kA @ 240VAC Interrupting Rating: Designed to safely interrupt fault currents up to 10,000 amperes at 240 volts AC.
• Thermal Magnetic Trip Unit: Combines inverse time thermal overload protection with instantaneous magnetic short-circuit protection.
• QBA Frame Design: Ensures proper compatibility within PowerPact Q-Frame systems.
• I-Line, Plug-On Mounting: Enables secure installation in approved I-Line panelboards.
• Molded Case Construction: Built to last under normal operating conditions in commercial and industrial environments.
  

Technical Specifications

• Part Number: QBA221251
  
• Frame Type: QBA (PowerPact Q-Frame)
  
• Amperage: 125 Amps
  
• Poles: 2
  
• Voltage Rating: 240VAC
  
• Interrupting Capacity (A.I.C.): 10kA @ 240VAC
  
• Trip Type: Thermal Magnetic
  
• Mounting Style: I-Line, Plug-On
  
• Phase Configuration: A-B Phase
  
• Breaker Type: Molded Case Circuit Breaker
  
• Approximate Shipping Weight: 3.0 lbs
  
• Approximate Height: 7.88 inches
  

Material Compliance and Certifications

• Industry Standards: The QBA221251 circuit breaker is manufactured to meet applicable UL and industry standards for molded case circuit breakers.
• NEC Compliance: It is designed for installation and use in accordance with the National Electrical Code (NEC) and relevant electrical safety guidelines. Always confirm compatibility with your specific panelboard and system requirements prior to installation.
  

Where It Works Best

• The QBA221251 is well suited for commercial buildings, light industrial facilities, and institutional environments using compatible I-Line panelboards and PowerPact Q-Frame systems. It is commonly applied in:
  • Distribution panels requiring 125A, 2-pole protection
  • Feeder circuit protection in commercial facilities
  • Equipment protection where 240VAC systems are present
  • Maintenance and replacement projects within existing QBA installations