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Square D QOB240GF GFCI Miniature Circuit Breaker
- 40A
- 2 Pole
- Bolt-On
Square D
QOB240GF
GFCI Miniature Circuit Breaker
Brand
Square D
SKU
QOB240GF
Quantity
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Square D QOB240GF - 40A GFCI Miniature Circuit Breaker
New
Quantity
Quantity
Square D QOB240GF - 40A GFCI Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB240GF |
| Series | QOB |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Square D NQ Panelboards, Square D NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No. 144, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Quantity
Square D QOB240GF - 40A GFCI Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QOB240GF-R |
| Series | QOB |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Square D NQ Panelboards, Square D NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No. 144, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Description
Engineered for commercial and industrial safety, the QOB240GF provides ground-fault and overcurrent protection on 120/240VAC systems. This 2-pole, 40A breaker safeguards personnel in demanding environments. It utilizes a bolt-on mounting style for a secure connection within Square D NQ and NQOD panelboards. While replaced by the QOB240GFI, it is a direct fit for existing setups. The unit delivers a 10kAIC rating and includes a Visi-Trip indicator to easily spot tripped circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB240GF |
| Series | QOB |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Square D NQ Panelboards, Square D NQOD Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFCI |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
| Accessories | Pigtail Neutral |
| Standards | CSA C22.2 No. 144, UL 489, UL 943 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhich panelboards are compatible with the QOB240GF circuit breaker?
This bolt-on breaker is designed for use in Square D NQ and NQOD panelboards. Unlike QO series breakers, the QOB series features a bolt-on connection and will not fit in standard QO residential load centers.
Is there a plug-on equivalent to the QOB240GF?
Yes, the QO240GFI is the plug-on equivalent. While the QOB240GF uses a bolt-on connection for NQ and NQOD commercial panelboards, the QO240GFI is designed for standard QO load centers.
What is the ground fault trip threshold for this breaker?
This breaker delivers Class A ground fault protection. It is engineered to trip when a ground fault of 6mA is detected, providing personnel protection in wet or damp locations.
How is the neutral connected on the QOB240GF?
This breaker includes a factory-installed pigtail neutral wire. It must be routed and connected directly to the neutral bar in the panelboard for the ground fault detection circuitry to function properly.
What wire sizes are accepted by the box lugs on this breaker?
The terminals accommodate 8 AWG to 2 AWG aluminum or copper conductors. Always ensure connections are torqued to the manufacturer specifications printed on the breaker label.
How can you identify if the QOB240GF has tripped?
This breaker features the signature Square D Visi-Trip indicator. When the breaker trips due to an overload, short circuit, or ground fault, a red indicator flag appears in the window to help quickly identify the faulted circuit.
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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