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Square D QOB250GFI GFCI Miniature Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Square D
QOB250GFI
GFCI Miniature Circuit Breaker
Brand
Square D
SKU
QOB250GFI
Quantity
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Square D QOB250GFI - 50A GFCI Miniature Circuit Breaker
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Description
Part of the QO family, this 50A two-pole breaker delivers Class A 6mA ground fault protection for commercial and industrial environments. It operates at 120/240VAC with a 10kAIC interrupting capacity, utilizing reliable thermal-magnetic trip technology. Designed specifically for Square D NQ and NQOD panelboards, it utilizes a bolt-on mounting style for secure installation. It accepts 14-6 AWG copper or 12-4 AWG aluminum wiring via standard box lugs.Specifications
| Brand | Square D |
|---|---|
| Series | QOB |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 14-6 AWG (Cu), 12-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFCI |
|---|---|
| Available Options | Padlock Attachment |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No. 5, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator |
Product FAQs
6 answersCan I install the QOB250GFI in a standard residential QO load center?
No. The QOB250GFI features a bolt-on mounting configuration designed specifically for NQ and NQOD panelboards. Standard residential QO load centers require plug-on style circuit breakers.
How do I wire this breaker for a straight 240V load that does not use a neutral wire?
You can supply a straight 240V load by terminating the two hot wires on the breaker and leaving the load neutral terminal empty. However, the breaker's white pigtail wire must still be connected to the panel neutral bus bar to power the internal GFCI circuitry.
Where does the attached white pigtail wire connect during installation?
The coiled white pigtail wire must be routed and connected directly to the neutral bus bar within the panelboard. This connection is mandatory for the GFCI sensor and the push-to-test functions to operate correctly.
How many panel spaces are required to mount this breaker?
The QOB250GFI is a 2-pole circuit breaker that requires two standard 3/4-inch spaces on the panelboard bus.
What is the ground-fault trip sensitivity of this breaker?
This breaker provides Class A ground-fault protection. It is designed to trip when it detects a ground-fault current between 4 and 6 milliamps, which is the standard threshold for personnel protection against electric shock.
Does the QOB250GFI provide combined AFCI and GFCI protection?
No. This unit is a dedicated Ground Fault Circuit Interrupter (GFCI). It provides standard thermal-magnetic overcurrent protection and ground-fault protection, but it does not include Arc Fault Circuit Interrupter (AFCI) functionality.
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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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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