Free Shipping Over $99
Square D Q221175BC Molded Case Circuit Breaker
- 175A
- 2 Pole
- I-Line
Square D
Q221175BC
Molded Case Circuit Breaker
Brand
Square D
SKU
Q221175BC
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D Q221175BC - 175A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Similar Items
150A 2 Pole Molded Case Circuit Breaker
175A 3 Pole Molded Case Circuit Breaker
175A 3 Pole Molded Case Circuit Breaker
Description
Engineered for industrial power distribution, the Square D Q221175BC provides 175 amps of thermal-magnetic protection. Designed for Square D I-Line panelboards, this MCCB allows for straightforward installation in existing enclosures. It supports aging infrastructure and is replaced by the QBA221754. Delivering a 10 kAIC capacity at 120/240V, it features a factory-configured BC phase connection. The unit is HACR rated and includes the Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q221175BC-R |
| Series | Q2 |
| Amperage | 175A |
| 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | I-Line Phase Connection BC (Factory Configured) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip |
Product FAQs
4 answersHow does the I-Line connection on the Q221175BC work?
The breaker features plug-on jaws on the line side that clamp directly onto the I-Line panelboard bus assembly. The load side utilizes standard mechanical lugs for wire termination.
What does the BC suffix mean in the Q221175BC catalog number?
The BC suffix indicates the factory-configured phase connection. This 2-pole breaker is designed to connect specifically to the B and C phases of a 3-phase I-Line bus.
What is the active replacement for the legacy Q221175BC?
The Q2 frame is a legacy series that has been superseded by the PowerPact Q-frame. The direct modern equivalent for a 175A, 2-pole, BC-phase I-Line breaker is catalog number QBA221754.
What type of protection does the LI trip function provide?
The LI designation stands for Long-Time and Instantaneous trip functions. The thermal Long-Time element protects against sustained overloads, while the magnetic Instantaneous element provides immediate tripping during short circuits.
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 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
Search
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.