Square D Q221100AC Molded Case Circuit Breaker
- 100A
- 2 Pole
- I-Line
Square D
Q221100AC
Molded Case Circuit Breaker
Brand
Square D
SKU
Q221100AC
Quantity
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Square D Q221100AC - 100A 2 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty applications, this 100A, 2-pole molded case circuit breaker offers robust thermal-magnetic protection. The legacy Q-Frame design ensures consistent performance across commercial and industrial environments. Designed with an I-Line mounting style, it plugs securely into compatible Square D panelboards. Facilities upgrading their systems can substitute this unit with the QBA221002. It features a 10kAIC rating at 120/240VAC, an AC phase connection, and a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Series | Q2 |
| Amperage | 100A |
| 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 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 | HACR Rated, Visual Trip Indicator, Common Trip |
Product FAQs
7 answersWhat is the modern replacement for the legacy Square D Q221100AC circuit breaker?
The direct modern replacement for the Q221100AC is the PowerPact Q-Frame QBA221002. It provides the same 100A rating, 2-pole configuration, and AC phase connection for I-Line panelboards.
What does the AC suffix indicate on the Q221100AC catalog number?
The AC suffix specifies the phase connection for the I-Line bus. This 2-pole breaker is factory-configured to connect exclusively to the A and C phases of the panelboard bus stack.
Can the Q221100AC be installed in a standard Square D QO or Homeline load center?
No. The Q221100AC features an I-Line style plug-in mounting design. It is only compatible with Square D I-Line power distribution panelboards and switchboards, not residential QO or Homeline load centers.
Does the Q221100AC feature an adjustable trip unit?
No. This breaker is equipped with a fixed thermal-magnetic trip unit. Both the long-time overload and instantaneous short-circuit trip functions are factory-set and cannot be adjusted in the field.
How does the Q221100AC secure to the I-Line panelboard bus?
The breaker utilizes Square D blow-on I-Line connection jaws. It pushes directly onto the bus stack and is secured in place with a retaining screw, eliminating the need for separate bus connectors or mounting hardware.
Are modern PowerPact Q-Frame breakers physically interchangeable with legacy Q2-Frame breakers like the Q221100AC?
Yes. The modern PowerPact Q-Frame breakers are designed as direct drop-in replacements for legacy Q2 Series devices. They share the same physical dimensions and I-Line bus interface, allowing for straightforward upgrades in existing panelboards without retrofitting.
Is the Q221100AC suitable for use with heating, air conditioning, and refrigeration equipment?
Yes. This breaker is HACR rated, meaning it has been tested and approved for the specific overcurrent protection requirements of heating, air conditioning, and refrigeration motor loads.
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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.