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Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Square D QO3100 Miniature Circuit Breaker
- 100A
- 3 Pole
- Plug-On
Square D
QO3100
Miniature Circuit Breaker
Brand
Square D
SKU
QO3100
Quantity
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Square D QO3100 - 100A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QO3100 - 100A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QO3100 |
| Series | QO |
| Amperage | 100A |
| 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 | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards, NQOD Panelboards, Speed-D Switchboard Distribution Panels |
| Wire Gauge | 4 AWG - 2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Shunt Trip, Padlock Attachment |
|---|---|
| Standards | HACR, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Sold out
Quantity
Square D QO3100 - 100A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QO3100-R |
| Series | QO |
| Amperage | 100A |
| 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 | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards, NQOD Panelboards, Speed-D Switchboard Distribution Panels |
| Wire Gauge | 4 AWG - 2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Shunt Trip, Padlock Attachment |
|---|---|
| Standards | HACR, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
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Description
Part of the QO series, this 100A, three-pole miniature circuit breaker provides thermal-magnetic protection for commercial systems. It is HACR rated for HVAC applications. This unit installs into Square D QO load centers, NQ panelboards, and Speed-D panels. The plug-on mounting ensures a secure busbar connection. Rated for 10kAIC at 120/240VAC, it features the exclusive Visi-Trip indicator, displaying a red flag when tripped to speed up troubleshooting.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO3100 |
| Series | QO |
| Amperage | 100A |
| 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 | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards, NQOD Panelboards, Speed-D Switchboard Distribution Panels |
| Wire Gauge | 4 AWG - 2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Shunt Trip, Padlock Attachment |
|---|---|
| Standards | HACR, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |
Product FAQs
7 answersHow many panel spaces does the QO3100 require?
As a 3-pole miniature circuit breaker, it requires three standard 0.75-inch spaces, occupying a total width of 2.25 inches on the panel bus.
Is there a bolt-on version of this 100A breaker?
Yes. If your commercial panelboard requires bolt-on connections instead of plug-on, you will need to source catalog number QOB3100.
Can I install this breaker in an NQ or NQOD commercial panelboard?
Yes, the QO3100 is compatible with both NQ and NQOD panel interiors. However, many commercial panels specify bolt-on breakers, so verify whether your specific enclosure requires this plug-on model or the bolt-on QOB3100 counterpart.
Can I use this 3-pole breaker on a 208Y/120V three-phase system?
Yes, the 120/240VAC voltage rating allows the QO3100 to be safely applied on standard 208Y/120V, 3-phase, 4-wire grounded wye systems.
What does the LI trip function mean for this breaker?
The LI designation indicates that the breaker uses a thermal-magnetic mechanism to provide Long-Time (L) protection for slow thermal overloads and Instantaneous (I) protection for immediate short-circuit clearing.
Are the terminal lugs rated for aluminum wire?
Yes, the factory box lugs accept both aluminum and copper conductors ranging from 4 AWG to 2/0 AWG. When terminating aluminum wire, always apply a listed joint compound to prevent oxidation.
Does the QO3100 provide ground fault protection?
No, this is a standard thermal-magnetic circuit breaker offering only standard overload and short-circuit protection. It does not include GFCI, EPB, or AFCI capabilities.
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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.
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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.
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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.
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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 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