QBA221504 - 150 Amp Circuit Breaker

QBA221504 - 150 Amp Circuit Breaker

The QBA221504 is a 150 amp, 2-pole molded case circuit breaker designed for use in I-Line panelboard systems. Built on the PowerPact Q-Frame platform, it provides thermal magnetic protection for 240VAC distribution systems with a 10kA interrupting rating. This breaker is typically found in commercial and light industrial installations where dependable overload and short-circuit protection is required.

Because it’s an I-Line plug-on style breaker, it installs directly into compatible panelboards without modification. If you're replacing an existing QBA series unit, this model matches the original form, fit, and function specifications. The 150A rating makes it suitable for larger branch circuits and feeder applications where steady current capacity and proper fault interruption are essential.

The thermal magnetic trip mechanism handles both prolonged overload conditions and instantaneous short circuits. In everyday use, that means it responds to heat buildup over time while also reacting quickly to fault events. These breakers were built for long-term service and continue to be widely used in existing distribution systems.

Key Features and Benefits

• 150 amp continuous current rating
• 2-pole breaker for 240VAC systems (B-C phase configuration)
• 10kA interrupting capacity at 240VAC
• Thermal magnetic trip unit
• I-Line plug-on mounting style
• PowerPact Q-Frame construction
• Molded case design built for lasting service

Technical Specifications

• Part Number: QBA221504
  
• Frame Type: QBA / PowerPact Q-Frame
  
• Poles: 2
  
• Amperage Rating: 150A
  
• Voltage Rating: 240VAC
  
• Interrupting Rating: 10kA @ 240VAC
  
• Trip Type: Thermal Magnetic
  
• Mounting: I-Line, Plug-On
  
• Phase: B-C Phase
  
• Height: 7.88 inches
  
• Ship Weight: 3.0 lbs
  

Material Compliance and Certifications

• The QBA221504 is manufactured in accordance with applicable UL standards for molded case circuit breakers. It is intended for use in properly rated panelboards and systems installed under National Electrical Code (NEC) guidelines. As with any replacement breaker, system voltage, amperage, and interrupting capacity should always be verified before installation.

Where It Works Best

• This breaker is commonly used in I-Line panelboards serving commercial buildings, schools, office spaces, and light industrial facilities. It’s often installed on feeder circuits, mechanical equipment, HVAC systems, and other 240VAC loads that require a 150 amp, 2-pole configuration.