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Square D QOB380 Miniature Circuit Breaker
- 80A
- 3 Pole
- Bolt-On
Square D
QOB380
Miniature Circuit Breaker
Brand
Square D
SKU
QOB380
Quantity
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Square D QOB380 - 80A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
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Square D QOB380 - 80A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB380 |
| Series | QOB |
| Amperage | 80A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Sold out
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Square D QOB380 - 80A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB380-R |
| Series | QOB |
| Amperage | 80A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Description
The QOB380 is part of Square D's QO family, delivering 80 amps of thermal-magnetic protection. Built for commercial environments, this three-pole unit provides reliable overcurrent defense for 120/240VAC systems. Designed with a bolt-on mounting style, it installs securely into NQ and NQOD panelboards. The breaker occupies three pole spaces and accepts 4 to 2/0 AWG wiring. Rated at 10 kAIC, it includes the signature Visi-Trip indicator to display a highly visible red flag when tripped.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB380-R |
| Series | QOB |
| Amperage | 80A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| 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 | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, NEMA AB 1, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
8 answersCan I install the QOB380 in a standard QO load center?
No. The QOB380 is a bolt-on circuit breaker designed exclusively for Square D NQ and NQOD panelboards. It cannot be installed in standard residential QO load centers, which require plug-on QO breakers.
How much panel space does the QOB380 require?
This 3-pole breaker occupies three standard spaces in an NQ or NQOD panelboard. Each pole is 3/4 inch wide, requiring a total panel width of 2.25 inches.
Is the QOB380 rated for DC applications?
Yes. In addition to its standard 120/240VAC rating, the QOB380 is rated for use on 48VDC systems with a 5kA interrupting capacity.
Does the QOB380 feature a visual trip indicator?
Yes. This breaker includes Square D's Visi-Trip indicator. When tripped, the handle moves to a center position and a high-visibility red flag appears in the indicator window to help you quickly identify the faulted circuit.
Do I need special lugs to terminate aluminum wire on the QOB380?
No. The standard factory-installed box lugs on the QOB380 are dual-rated for both aluminum and copper (Al/Cu) conductors. They accept wire sizes ranging from 4 AWG to 2/0 AWG.
Can I add a field-installable shunt trip to the QOB380?
No. Square D QO and QOB circuit breakers do not support field-installable internal accessories. Shunt trips, auxiliary switches, and alarm switches must be factory-installed and are identified by a specific catalog suffix (such as -1021).
Is the QOB380 suitable for HVAC equipment?
Yes. The QOB380 is HACR rated, making it fully approved for use with compatible heating, air conditioning, and refrigeration equipment that require this specific listing for overcurrent protection.
Will a fault on one phase trip the entire breaker?
Yes. The QOB380 features a common-trip mechanism. A thermal overload or short circuit on any single pole will force all three poles to open simultaneously, safely disconnecting the entire 3-phase load.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 205 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 3/11/26
Customers say these electrical breakers arrive exactly as ordered and work perfectly for their intended applications. They consistently praise the competitive pricing, which many report is significantly lower than local suppliers. Fast shipping and prompt delivery are frequently highlighted, with many receiving orders within days or even next-day delivery for urgent needs. The breakers arrive well-packaged and in excellent condition. Many reviews emphasize the company's extensive inventory availability, particularly for hard-to-find breakers. One customer experienced difficulty with order cancellation and was charged a restocking fee, which caused dissatisfaction.
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Rating
205 reviews
- BLBOOSTIX L.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/17/26QOB220
That's nice breakers!
- PHPaul H.Verified BuyerReviewingSquare D QOB330 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/26Quick shipping and delivery
Shipped and delivered on time for installation at one of our projects. Thank you!
- RMRick M.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Project Mgr
Just what I needed.
- DHDoug H.Verified BuyerReviewingSquare D QOB220 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Square D QOB breakers
As always, our order arrived timely, and accurate. You can’t beat their prices that’s why we have used this company for years.
- RKRyan K.Verified BuyerReviewingSquare D QOB230VH - 30A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/1/26Awesome
Worked great