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Square D Q221125AC Molded Case Circuit Breaker
- 125A
- 2 Pole
- I-Line
Square D
Q221125AC
Molded Case Circuit Breaker
Brand
Square D
SKU
Q221125AC
Quantity
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Square D Q221125AC - 125A 2 Pole Molded Case Circuit Breaker
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Description
Part of the legacy Q2 series, the Square D Q221125AC is a 2-pole MCCB. It offers a 125A rating and utilizes thermal-magnetic trip technology for dependable overcurrent protection. The breaker installs into Square D I-Line panelboards using an AC phase connection. Facilities looking to upgrade can substitute this component with the QBA22125 model. The unit provides a 10kAIC rating at 120/240VAC. It incorporates a Visi-Trip visual indicator, simplifying troubleshooting during electrical faults.Specifications
| Brand | Square D |
|---|---|
| Series | Q2 |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 4 AWG - 300 kcmil (Al/Cu) |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Phase Connection: A and C Phases |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
6 answersIs the Square D Q221125AC circuit breaker still manufactured?
The Q221125AC is part of the legacy Q2 series and has been superseded by the PowerPact Q-frame series. The direct modern replacement is the QBA22125, which offers the same 125A rating, 2-pole configuration, and 10kAIC interrupting capacity for I-Line panelboards.
What does the AC suffix mean in the Q221125AC catalog number?
The AC suffix indicates the breaker is factory configured for an A and C phase connection on the I-Line panelboard bus. This is critical to verify when balancing loads across a 3-phase panel system.
How does the Q221125AC connect to the electrical system?
This breaker features an I-Line style plug-in connection on the line side, which mounts directly to the panelboard bus. The load side utilizes mechanical lugs that accept 4 AWG to 300 kcmil aluminum or copper conductors.
Can I install the Q221125AC in a standard QO or Homeline load center?
No, this breaker is specifically designed for Square D I-Line panelboards and switchboards. It will not fit in QO, Homeline, or NQ series panels.
Can the Q221125AC be used on a 208Y/120V system?
Yes, while it carries a maximum voltage rating of 240V AC, it is fully compatible with 208Y/120V and 120/240V systems, providing a 10kAIC interrupting rating.
Does the Q221125AC feature a tripped status indicator?
Yes, this breaker incorporates a Visi-Trip visual indicator. When the breaker trips due to an overcurrent or short circuit, a red flag appears in the window to help quickly identify the faulted circuit.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 7 reviews.
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Rating
7 reviews
- MEMichael E.Verified BuyerReviewingSquare D Q221150AC - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/28/26breaker purchase
delivered on time and quality was as advertised
- MWmakalita w.Verified BuyerReviewingSquare D Q232150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/18/26Prompt service.
Well packaged
- AWAllen W.ReviewingSquare D Q232175 - 175A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/17/22Great condition
The breakers were in great condition. The serve was also great.
- JCJim C.ReviewingSquare D Q232200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/13/22Great Service
My order was received fast. The packaging was perfect. The quality of the product was what was expected.
- RDRosemarie D.ReviewingSquare D Q232150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/1/20home
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