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Square D QDA221251 Molded Case Circuit Breaker
- 125A
- 2 Pole
- I-Line
Square D
QDA221251
Molded Case Circuit Breaker
Brand
Square D
SKU
QDA221251
Quantity
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Square D QDA221251 - 125A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D QDA221251 - 125A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QDA221251 |
| Series | QDA |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 1 |
| AIC Rating | 25kA @ 208Y/120VAC, 25kA @ 240VAC |
| Frame Type | QDA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Switchboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | I-Line Phase Connection AB |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip |
Sold out
Quantity
Square D QDA221251 - 125A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QDA221251-R |
| Series | QDA |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 1 |
| AIC Rating | 25kA @ 208Y/120VAC, 25kA @ 240VAC |
| Frame Type | QDA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Switchboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | I-Line Phase Connection AB |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip |
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Description
Built for robust industrial applications, the Square D QDA221251 is a 125-amp, 2-pole molded case circuit breaker belonging to the PowerPacT Q-Frame series. It delivers fixed thermal and magnetic protection with standard LI functions. Designed for seamless integration, this breaker installs into Square D I-Line panelboards and switchboards using an AB phase connection. It is a drop-in substitute for older Q221251 models. This 240V breaker features a 25kAIC interrupting rating and Visi-Trip.Specifications
| Brand | Square D |
|---|---|
| Part Number | QDA221251 |
| Series | QDA |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 1 |
| AIC Rating | 25kA @ 208Y/120VAC, 25kA @ 240VAC |
| Frame Type | QDA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Switchboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | I-Line Phase Connection AB |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip |
Product FAQs
8 answersWhat panelboards are compatible with the QDA221251 circuit breaker?
The QDA221251 features an I-Line plug-in mounting style and is designed exclusively for use in Square D I-Line panelboards and switchboards. It will not fit in standard NQ, NF, or QO series panels.
What does the "1" at the end of the QDA221251 catalog number indicate?
The "1" suffix indicates that this breaker is factory-configured for an AB phase connection on the I-Line bus. If your installation requires an AC or BC phase connection, a different catalog number suffix is needed.
Can the QDA221251 be used to replace older Square D breakers?
Yes, the PowerPacT Q-Frame QDA221251 is a direct drop-in replacement for legacy Square D Q221251 circuit breakers. Both models share the same physical dimensions and I-Line mounting configuration.
How much mounting space does the QDA221251 require on an I-Line bus?
As a 2-pole Q-Frame breaker, the QDA221251 requires 3 inches of vertical mounting height on the I-Line panelboard or switchboard bus.
What wire sizes are accepted by the lugs on the QDA221251?
The factory-installed mechanical lugs on this breaker are dual-rated for both aluminum (Al) and copper (Cu) conductors, accepting wire sizes from 4 AWG up to 300 kcmil.
Are the thermal and magnetic trip settings adjustable on the QDA221251?
No, this breaker is equipped with a fixed thermal and fixed magnetic trip unit. The long-time (L) and instantaneous (I) trip functions are factory-set and cannot be modified in the field.
What does the "D" in the QDA221251 part number signify?
In the Square D PowerPacT Q-Frame catalog numbering system, the "D" indicates a D-interrupting rating. This provides a maximum interrupting capacity of 25kA at 240VAC.
Can the QDA221251 be used on a 208Y/120V system?
Yes, while it has a maximum voltage rating of 240VAC, it is fully rated for use on 208Y/120VAC systems, maintaining its 25kA interrupting rating at that voltage.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 6 reviews.
Total 5 star reviews: 6 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
6 reviews
- CBCarl B.Verified BuyerReviewingSquare D QDA32125 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/11/26Sq. D I-line
Price was fair for these New Breakers. More importantly, is the avaiability and not having to deal with long lead times
- CSClaus S.Verified BuyerReviewingSquare D QDA32100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/3/26100A 3 phase Breaker
Priced right and shipping was really Quick. I will use them again!!
- CGChase G.ReviewingSquare D QDA32150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/16/22Always have what I need
5 stars Super Breaker always has what I need, and at a good price.
- CGChristopher G.ReviewingSquare D QDA32100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/11/21speedy service. great quality
speedy service. great quality
- RSRandy S.ReviewingSquare D QDA32225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/19Super
Quick Shipping and great price