Free Shipping Over $99
Square D QBA221751 Molded Case Circuit Breaker
- 175A
- 2 Pole
- I-Line
Square D
QBA221751
Molded Case Circuit Breaker
Brand
Square D
SKU
QBA221751
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D QBA221751 - 175A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D QBA221751 - 175A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QBA221751 |
| Series | QBA |
| Amperage | 175A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 208Y/120VAC, 10kA @ 240VAC |
| Frame Type | QBA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | AB Phase Connection (Factory Configured) |
| Standards | CSA C22.2 No 5, HACR, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip, 80% Rated, Phase Connection AB |
Sold out
Quantity
Square D QBA221751 - 175A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QBA221751-R |
| Series | QBA |
| Amperage | 175A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 208Y/120VAC, 10kA @ 240VAC |
| Frame Type | QBA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | AB Phase Connection (Factory Configured) |
| Standards | CSA C22.2 No 5, HACR, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip, 80% Rated, Phase Connection AB |
Similar Items
175A 2 Pole Molded Case Circuit Breaker
200A 2 Pole Molded Case Circuit Breaker
200A 2 Pole Molded Case Circuit Breaker
Description
The Square D QBA221751 is a robust 175A, 2-pole molded case circuit breaker designed for commercial facilities. Belonging to the PowerPacT Q-Frame series, it features a fixed thermal-magnetic trip unit for LI protection and an AB phase connection. Designed exclusively for Square D I-Line panelboards, it serves as a reliable upgrade for legacy Q22175 breakers. Delivering a 10kAIC capacity at 240VAC, this breaker is HACR rated for motor-driven HVAC loads and features a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QBA221751 |
| Series | QBA |
| Amperage | 175A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 208Y/120VAC, 10kA @ 240VAC |
| Frame Type | QBA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | AB Phase Connection (Factory Configured) |
| Standards | CSA C22.2 No 5, HACR, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip, 80% Rated, Phase Connection AB |
Product FAQs
7 answersWhat panelboards are compatible with the QBA221751 circuit breaker?
This PowerPacT Q-Frame breaker is designed exclusively for installation in Square D I-Line panelboards and switchboards. It utilizes an I-Line style plug-in connection and cannot be used in standard load centers.
Can the QBA221751 be used to replace older Square D breakers?
Yes, this breaker serves as a direct, modern replacement for legacy Square D Q2 series breakers, such as the Q22175, in existing 240V I-Line panelboards.
How is this Q-Frame breaker installed into an I-Line panel?
The breaker features a plug-on design. The mounting bracket aligns with slots in the panel pan, and the jaws press onto the bus bars. A flat-blade screwdriver is used with the racking mechanism to fully seat the breaker against the bus, and a retaining screw secures it in place.
What wire sizes are accepted by the terminals on this 175A breaker?
The factory-installed load lugs accept aluminum or copper (Al/Cu) wire ranging from 4 AWG to 300 kcmil. Ensure proper torque specifications are followed during installation.
Are the trip settings adjustable on the QBA221751?
No, this breaker features a thermal-magnetic trip unit with fixed Long-Time and Instantaneous (LI) functions. Neither the thermal overload nor the magnetic short-circuit trip thresholds can be adjusted in the field.
Is this breaker suitable for use with commercial HVAC equipment?
Yes, the QBA221751 is HACR rated, making it suitable for protecting motor-driven heating, air conditioning, and refrigeration equipment.
How can I tell if this breaker has tripped in a crowded panel?
Like many Square D breakers, this model features a Visi-Trip indicator. When a fault causes the breaker to trip, the handle moves to a center position and a highly visible red indicator appears, allowing for quick identification.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 4.6 out of 5 based on 12 reviews.
Total 5 star reviews: 10 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 1
Search
Rating
12 reviews
- DMDonaldo M. A.Verified BuyerReviewingSquare D QBA32125 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/7/26Fast, Easy and Great Item
I bought this item for the first time and it was great! through the website it was easy to find my exact item and also the payment was easy to submit, deliver was on point.
Great company and products.
- KPKevin P.Verified BuyerReviewingSquare D QBA32200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/5/26Sq D I line breaks
Great price and is exactly what was discribed
- DDDavid D.Verified BuyerReviewingSquare D QBA32110 - 110A 3 Pole Molded Case Circuit BreakerI do not recommend this productRated 1 out of 5 stars1/20/26Breaker
Need to return this item.
- DMDave M.Verified BuyerReviewingSquare D QBA32150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/12/25Excellent All Around
Speedy shipping and great staff to work with.
- DBDoug B.ReviewingSquare D QBA32200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/28/23Great service, great item!
Great service, great item!