Q2125B - 125Amp Circuit Breaker

Q2125B - 125Amp Circuit Breaker

When you're replacing a circuit breaker, getting the details right matters. The Q2125B is a 125-amp, 2-pole Type QPP plug-in circuit breaker rated for 120/240 VAC, with a 10 kAIC rating. If those are the specifications your equipment requires, this breaker offers a straightforward option for maintenance, replacement, or repair.

The Q2125B measures 5.25 inches high, 4 inches wide, and 2.56 inches deep. It requires 4–6 spaces, which is worth checking before installation—especially when working with an existing panel where space may already be limited. Its plug-in design is intended for compatible equipment and provides a practical installation configuration for electrical professionals.

Rather than choosing a breaker based on amperage alone, it's important to match the complete set of specifications. With the Q2125B, that means confirming the 125A rating, two-pole configuration, Type QPP design, 120/240VAC rating, 10k interrupting capacity, physical size, and space requirements. A quick check of these details can help prevent the frustration of ending up with a breaker that isn't right for the application.

Key Features and Benefits

• 125-amp rating for applications specifically requiring 125A circuit protection.
• 2-pole configuration for compatible 120/240VAC applications.
• 10k AIC at 120/240VAC provides a 10,000-amp interrupting rating.
• Plug-in design for use in compatible electrical equipment.
• Type QPP construction makes it easier to match the breaker to equipment that calls for this breaker type.
• Measures 5.25" H x 4.0" W x 2.56" D, giving you clear dimensions to check before installation.
• Requires 4–6 spaces, an important detail when confirming available panel space.
• Specified with a 40°C rating.

Technical Specifications

• Part Number: Q2125B
  
• Type: QPP
  
• Amperage: 125A
  
• Poles: 2
  
• Voltage Rating: 120/240VAC
  
• AIC Rating: 10k at 120/240VAC
  
• Installation: Plug-In
  
• Temperature Rating: 40°C
  
• Height: 5.25 in.
  
• Width: 4.0 in.
  
• Depth: 2.56 in.
  
• Space Requirement: 4–6 spaces
  

Material Compliance and Certifications

• No specific material composition, agency certifications, listings, or material compliance information was provided in the available specifications for the Q2125B. If your project requires a particular certification, listing, or compliance standard, check the product labeling and applicable documentation before installation.

Where It Works Best

• The Q2125B circuit breaker is best suited for applications that specifically require a 125-amp, 2-pole Type QPP plug-in breaker with a 120/240VAC rating and 10k AIC. It can be a practical fit for electrical maintenance, repair, and replacement work when those specifications match the existing equipment.
  
  And don't forget the physical fit. The Q2125B requires 4–6 spaces, so checking available space is just as important as confirming amperage and voltage.