Square D QO320-2100 QO3202100 - 20A 3 Pole Miniature Circuit Breaker
- 20A
- 3 Pole
- Plug-On
Square D
QO320-2100
QO3202100 - 20A 3 Pole Miniature Circuit Breaker
Brand
Square D
SKU
QO320-2100
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Square D QO3202100 - 20A 3 Pole Miniature Circuit Breaker
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Description
Designed to enhance system monitoring, the QO320-2100 incorporates a factory-installed alarm switch alongside standard overcurrent protection. This 3-pole, 20A breaker is perfect for critical circuits where immediate notification of a tripped condition is required. Compatible with Square D QO load centers and NQ panelboards, the plug-on assembly utilizes four pole spaces. It connects easily using standard pressure plate terminals.Specifications
| Brand | Square D |
|---|---|
| Series | QO |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QO |
|---|---|
| Terminal Type | Pressure Plate |
| For Use With | QO Load Centers, NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-8 AWG (Al/Cu) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch |
|---|---|
| Accessories | Alarm Switch |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1, RoHS |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat does the -2100 suffix indicate on the QO320-2100 circuit breaker?
The -2100 suffix indicates that this breaker includes a factory-installed alarm switch. These integrated contacts activate upon a trip event to provide remote status indication for critical commercial or industrial circuits.
Which panelboards are compatible with the QO320-2100 breaker?
This plug-on breaker is designed specifically for use in Square D QO load centers, as well as NQ and NQOD series panelboards. It requires a 3-phase bus configuration to accommodate its 3-pole design.
Does the QO320-2100 provide ground fault or arc fault protection?
No, this is a standard thermal-magnetic circuit breaker designed for overload and short-circuit protection. It does not include Ground Fault Circuit Interrupter (GFCI) or Arc Fault Circuit Interrupter (AFCI) functionality.
How does the thermal-magnetic trip mechanism function on this breaker?
The fixed thermal-magnetic mechanism provides two levels of protection. The thermal element offers long-time protection by tripping in response to sustained overloads, while the magnetic element provides instantaneous tripping when a severe short circuit is detected.
Does the QO320-2100 feature a visual trip indicator?
Yes, it includes a Visi-Trip indicator. When the breaker trips due to an overload or short circuit, a highly visible red indicator appears in the window to help quickly identify the faulted circuit within the panel.
What wire sizes and materials are accepted by the terminals on the QO320-2100?
The pressure plate terminals are rated for both aluminum and copper conductors, accepting wire sizes from 14 AWG up to 8 AWG. Always ensure the wire gauge matches the 20A circuit requirements and local electrical codes.
Is the QO320-2100 suitable for systems with high available fault current?
This breaker has a standard interrupting rating of 10kAIC at 120/240VAC. If your electrical system has an available fault current higher than 10,000 amps, you will need a breaker with a higher AIC rating or a properly series-rated combination.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 285 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 6/13/26
Customers say these circuit breakers arrive quickly and work as described. Fast shipping and competitive pricing are frequently mentioned, with many noting same-day or next-day delivery. Users appreciate the wide inventory, particularly for hard-to-find older-style models unavailable locally. The products function reliably and arrive in good condition. Most customers report straightforward ordering and positive interactions. However, some experienced delivery delays or received incorrect items requiring reordering. A few noted concerns about condition upon arrival or customer service responsiveness.
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Rating
285 reviews
- GCGerard C.Verified BuyerReviewingSquare D QO130GFI - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/21/26Great !
I could not find the breaker in hardwood stores. Superbreakers took car of it in a week.
- RHRoy H.Verified BuyerReviewingSquare D QO280 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/17/26Square D QO280 - 80A 2 Pole Miniature Circuit Breaker
Exactly as described
- KWKevin W.Verified BuyerReviewingSquare D QO120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/15/26Great Price
Brand spanking new!
- CEchristopher e.Verified BuyerReviewingSquare D QO115PDF - 15A Dual Function Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26My breakers
Had a hard time locating these breakers locally, when I did find 1 they wanted to charge me triple what superbreakers charged. Items delivered exactly when they said they would, were exactly what I ordered. Appreciated the ease of ordering, definitely my go to from this point on
- JCJerry C.Verified BuyerReviewingSquare D QO250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/8/26Great quality
No issues