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Square D Q221150AC Molded Case Circuit Breaker
- 150A
- 2 Pole
- I-Line
Square D
Q221150AC
Molded Case Circuit Breaker
Brand
Square D
SKU
Q221150AC
Quantity
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Square D Q221150AC - 150A 2 Pole Molded Case Circuit Breaker
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Description
Built for robust commercial and industrial power distribution, this 150-amp thermal-magnetic breaker ensures dependable overcurrent protection. The unit fastens securely into Square D I-Line panelboards, specifically utilizing an A-C phase connection to help balance panel loads. Rated for 10kA fault current, it features the signature Visi-Trip flag for rapid fault identification and serves as a predecessor to the modern PowerPact QBA221502 series.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q221150AC-R |
| Series | Q2 |
| Amperage | 150A |
| 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Phase Connection A-C |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip |
Product FAQs
7 answersIs the Square D Q221150AC circuit breaker still manufactured?
No, the Q2 series frame is obsolete and has been discontinued by Schneider Electric. It has been directly replaced by the modern PowerPact Q-Frame series. For a direct 150A, 2-pole I-Line replacement with an AC phase connection, the modern equivalent is catalog number QBA221502.
What does the AC suffix indicate on the Q221150AC catalog number?
The AC suffix specifies the phase connection for the I-Line plug-on mounting. It means this 2-pole breaker is configured to connect specifically to the A and C phases on the panelboard bus, which helps facility managers balance electrical loads across the panel.
Which panelboards are compatible with the Q221150AC circuit breaker?
This breaker is designed exclusively for use in Square D I-Line panelboards and switchboards. It features the specialized I-Line plug-on mounting bracket and jaws, so it will not fit in standard NQ, NQOD, or Homeline load centers.
What is the purpose of the Visi-Trip indicator on this Q2 frame breaker?
The Visi-Trip indicator is a highly visible red flag that appears in the breaker window when it trips due to an overcurrent or short circuit. This allows electricians and maintenance personnel to quickly identify the tripped breaker in a crowded I-Line panelboard during troubleshooting.
Is the Q221150AC suitable for HVAC equipment?
Yes, this breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment that requires specialized overcurrent protection for motor-driven closed-loop systems.
Does the Q221150AC require a separate mounting hardware kit?
No, the Q221150AC features an integrated I-Line mounting bracket and plug-on jaws. It is designed to snap directly onto the I-Line bus and secure with a retaining screw, requiring no additional mounting hardware kits.
Can the trip settings on the Q221150AC be adjusted?
No, this breaker features a fixed thermal-magnetic trip unit. Both the long-time overload and instantaneous short circuit trip thresholds are factory set and cannot be modified in the field.
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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.