QDA221252 - 125 Amp Circuit Breaker

QDA221252 - 125 Amp Circuit Breaker

If you’re looking for a circuit breaker that simply gets the job done—day in and day out—the Square D PowerPacT QDA221252 is built for exactly that. Designed for 240VAC systems, this 125 amp, 2-pole breaker gives you dependable overcurrent protection without unnecessary complexity. It uses proven thermal-magnetic trip technology, so it reacts quickly to overloads while still handling temporary surges without nuisance tripping. That balance is what keeps your systems running smoothly instead of constantly shutting down. What really makes this breaker stand out is how practical it is in the field. The I-Line connection on the line side helps speed up installation in compatible panelboards, which means less time on the job and fewer headaches. On the load side, mechanical lugs give you flexibility with wiring, whether you’re working on a new install or a retrofit. And when it comes time for maintenance or testing, the built-in push-to-trip button lets you verify operation instantly—no guesswork involved. With a 25kA interrupting rating, the QDA221252 is ready to handle serious fault conditions, helping protect both equipment and personnel. It’s also designed for long-term use, with solid construction and high mechanical endurance that holds up in demanding environments. Whether you’re managing a facility or wiring up a new system, this breaker offers the kind of reliability you don’t have to think twice about.

Key Features and Benefits

• 125 Amp, 2-Pole Design – Perfect for 240VAC power distribution needs
• Thermal-Magnetic Protection – Responds accurately to both overloads and short circuits
• 25kA Interrupting Capacity – Provides strong protection during high fault events
• I-Line Mounting – Speeds up installation and ensures a secure connection
• Push-to-Trip Button – Makes testing and maintenance quick and easy
• Flexible Load Connections – Mechanical lugs accommodate a wide range of wire sizes
• HACR Rated – Suitable for HVAC and refrigeration system applications

Technical Specifications

• Manufacturer Series: PowerPacT Q
• Catalog Number: QDA221252
• Amperage Rating: 125A
• Poles: 2
• Voltage Rating: 240VAC (50/60 Hz)
• Interrupting Rating: 25kA @ 120/208VAC and 240VAC
• Trip Type: Thermal-Magnetic
• Magnetic Trip: 2400A
• Mounting Style: I-Line (line), lug (load)
• Continuous Current Rating: 80%
• Dimensions: 6.47" H x 3" W x 3.93" D
• Wire Range: AWG 4 to 300 kcmil
• Torque: 247.8 lb-in
• Mechanical Life: 5,000 cycles (no load)

Material Compliance and Certifications

• UL Listed
• CSA Certified
• NOM Compliant
• IEC Certified
• Built to meet strict safety and performance standards, giving you confidence in both compliance and long-term operation.

Where It Works Best

• Commercial buildings and office power distribution systems
• Industrial facilities with demanding electrical loads
• HVAC and refrigeration equipment (HACR applications)
• I-Line panelboards require fast, secure installation
• Lighting and general power circuits
• New construction projects or retrofit upgrades