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Square D Q221175AB Molded Case Circuit Breaker
- 175A
- 2 Pole
- I-Line
Square D
Q221175AB
Molded Case Circuit Breaker
Brand
Square D
SKU
Q221175AB
Quantity
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Square D Q221175AB - 175A 2 Pole Molded Case Circuit Breaker
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Description
Built for industrial distribution, the Q221175AB is a 175-amp molded case circuit breaker featuring a dedicated AB phase connection. This 2-pole breaker utilizes Square D's proven I-Line mounting system, allowing for rapid, plug-on installation into compatible I-Line panelboards. It delivers a 10kAIC interrupt rating at 120/240VAC and includes a Visi-Trip indicator for fast troubleshooting. For modern panel upgrades, this legacy Q2 frame has been replaced by the QBA221751 model.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q221175AB |
| Series | Q2 |
| Amperage | 175A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q221 |
|---|---|
| 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 | I-Line Jaws |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Phase Connection AB |
Product FAQs
5 answersWhat panelboards are compatible with the Square D Q221175AB circuit breaker?
The Q221175AB is designed exclusively for use in Square D I-Line panelboards and switchboards. It utilizes an I-Line style plug-in connection for rapid installation onto the bus assembly.
Is there a modern replacement for the legacy Q221175AB circuit breaker?
Yes. The Q221175AB is a legacy Q2 frame breaker. For modern panel upgrades, it has been replaced by the PowerPacT Q-Frame QBA221751 model, which maintains the same 175A rating, 2-pole configuration, and AB phase connection for I-Line panelboards.
What does the AB suffix in the Q221175AB catalog number signify?
The AB suffix indicates that this 2-pole breaker is factory-configured for a dedicated AB phase connection on the I-Line bus.
Does the Q221175AB feature a visual trip indicator?
Yes, this breaker includes a Visi-Trip indicator. This provides a clear visual cue when the breaker has tripped, allowing for faster troubleshooting and maintenance in commercial and industrial distribution systems.
Are the thermal and magnetic trip settings adjustable on this breaker?
No. The Q221175AB features a thermal-magnetic trip unit with fixed long-time (overload) and fixed instantaneous (short-circuit) protection. The trip unit is non-interchangeable.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 8 reviews.
Total 5 star reviews: 8 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
8 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
- GSGreg S.Verified BuyerReviewingSquare D Q232200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/29/25Great Job
Whenever I need a breaker and my local distributor can't handle or get what I need, Superbreakers has always come through for us.
- 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.