Q221150AB - 150 Amp Circuit Breaker

Q221150AB - 150 Amp Circuit Breaker

The Q221150AB is a 150-Amp, 2-pole molded-case circuit breaker designed for use with compatible electrical distribution equipment in a Q2, Q-Frame configuration. It features A-B phasing, an I-Line plug-on connection, and thermal-magnetic protection, with an interrupting rating of 10 kA at 120/240 VAC. If you’re replacing a breaker in an existing system, these details are worth checking carefully. Amperage is only part of the equation the frame, phasing, number of poles, voltage rating, mounting style, and physical dimensions all need to line up with the equipment. Measuring 7.88 inches high, 3 inches wide, and 4.31 inches deep, the Q221150AB is a practical choice for applications specifically designed around this breaker configuration. Its molded case construction and straightforward thermal-magnetic design are built to last when the breaker is properly matched, installed, and used within its specified ratings.

Key Features and Benefits

• 150 Amp rating for compatible electrical distribution applications.
• 2-pole design for systems calling for this specific pole configuration.
• 10 kA A.I.C. rating at 120/240 VAC provides a clearly defined interrupting capacity for proper application matching.
• Thermal-magnetic protection responds to both overload and short-circuit conditions.
• Q2, Q-Frame configuration helps ensure the correct physical and functional match for compatible equipment.
• A-B phasing for installations specifically requiring this phase arrangement.
• I-Line plug-on design allows the breaker to connect to compatible I-Line equipment.
• Molded case construction provides a durable enclosure for the breaker’s internal components.
• Well-suited for legacy electrical systems where maintaining the original form, fit, and function is important.

Technical Specifications

• Part Number: Q221150AB
  
• Type: Q2
  
• Frame: Q-Frame
  
• Product Type: Molded Case Circuit Breaker
  
• Amperage: 150 A
  
• Poles: 2
  
• Voltage: 120/240 VAC
  
• A.I.C. Rating: 10 kA @ 120/240 VAC
  
• Protection Type: Thermal Magnetic
  
• Phasing: A-B
  
• Connection: I-Line, Plug-On
  
• Height: 7.88 in.
  
• Width: 3.0 in.
  
• Depth: 4.31 in.
  

Material Compliance and Certifications

• Certification and material-compliance details are not included in the available specifications for the Q221150AB, so they should not be assumed. If your installation calls for a particular agency listing, certification, or material standard, check the markings on the breaker and the applicable equipment documentation before installation.
• It’s also important to confirm that the breaker’s electrical ratings and connection style are approved for the equipment where it will be used. Final suitability should be determined by a qualified electrical professional and in accordance with applicable electrical codes.

Where It Works Best

• The Q221150AB 150 Amp 2-pole circuit breaker makes the most sense in existing and legacy electrical systems designed for its particular combination of Q-Frame construction, A-B phasing, I-Line plug-on mounting, and 120/240 VAC operation.
• For replacement work, matching the complete specification is key. Two breakers can share the same amperage and still have important differences in frame size, phasing, mounting, interrupting capacity, or dimensions. If the existing equipment calls for Q221150AB, compare the part number and ratings carefully before installation.