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Square D Q221100AB Molded Case Circuit Breaker
- 100A
- 2 Pole
- I-Line
Square D
Q221100AB
Molded Case Circuit Breaker
Brand
Square D
SKU
Q221100AB
Quantity
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Square D Q221100AB - 100A 2 Pole Molded Case Circuit Breaker
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Description
Rated for 100 amps at 120/240VAC, this legacy Q-Frame molded case circuit breaker ensures robust overcurrent protection for industrial facilities. It integrates into Square D I-Line panelboards and requires a Phase A-B bus connection for proper installation. Facility managers often seek this specific model to avoid retrofitting, though the PowerPact QBA221001 serves as the modern replacement. Standard features include HACR certification, common trip functionality, and a visual 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 | Phase Connection AB |
| Standards | UL 489, CSA C22.2 No. 5, NEMA AB 1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Common Trip |
Product FAQs
6 answersWhat panelboards are compatible with the Q221100AB circuit breaker?
This breaker is designed specifically for installation in Square D I-Line panelboards and switchboards. It is not compatible with standard load centers or NQ/NF series panels.
What does the AB suffix in the Q221100AB catalog number signify?
The AB suffix indicates the breaker's plug-in jaws are configured to connect specifically to the A and B phases of the I-Line busbar system.
What is the modern replacement for the legacy Q221100AB breaker?
The Q221100AB is a legacy Q-Frame breaker. The direct modern replacement for a 100A, 2-pole, A-B phase I-Line application is the Square D PowerPact Q-Frame, specifically catalog number QBA221001.
What wire sizes and materials are supported by the terminals on this breaker?
The factory-installed lugs accept either aluminum or copper conductors ranging from 4 AWG to 300 kcmil.
Are the thermal and magnetic trip settings adjustable on the Q221100AB?
No, this breaker features a fixed thermal-magnetic trip unit. Both the long-time overload and instantaneous short-circuit trip functions are factory set and non-adjustable.
How does the Q221100AB connect to the panelboard?
It utilizes an I-Line style plug-in connection, allowing the breaker jaws to press directly onto the panelboard's busbars for a secure electrical connection.
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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.