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Square D QOB340EPD GFEP Miniature Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Square D
QOB340EPD
GFEP Miniature Circuit Breaker
Brand
Square D
SKU
QOB340EPD
Quantity
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Square D QOB340EPD - 40A GFEP Miniature Circuit Breaker
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Description
Shielding critical three-phase loads from electrical damage, this 40A equipment protection device features a specialized 30mA ground fault trip threshold. The bolt-on mounting style guarantees a robust connection within Square D NQ and NQOD panelboards, preventing loose seating in high-vibration commercial settings. With a 10kA interrupting capacity at 240VAC and a built-in Visi-Trip flag, facility managers gain enhanced safety and rapid visual diagnostics during fault events.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB340EPD |
| Series | QOB |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | NQ Panelboards, NQOD Panelboards |
| Wire Gauge | 12-4 AWG (Al), 14-6 AWG (Cu) |
| Max Wire | 4 AWG (Al), 6 AWG (Cu) |
| Min Wire | 12 AWG (Al), 14 AWG (Cu) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LIG |
| Trip Function | Long-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Fixed |
| Special Classification | GFEP |
|---|---|
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489, UL 1053 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, RoHS Compliant, Mercury Free |
Product FAQs
6 answersWhich panelboards are compatible with the QOB340EPD circuit breaker?
This bolt-on breaker is designed exclusively for Square D NQ and NQOD panelboards. It will not fit in standard QO load centers, which require plug-on breakers.
How many panel spaces does the QOB340EPD require?
This 3-pole breaker requires three standard 0.75-inch spaces in an NQ or NQOD panelboard.
What is the ground fault trip sensitivity for this breaker?
The QOB340EPD is an Equipment Protection Device (EPD) with a 30mA ground fault trip threshold. It is designed to protect machinery and equipment from low-level faults, not for Class A personnel protection which requires a 5mA threshold.
Does this breaker require a neutral connection?
Yes, it features a pigtail neutral that must be connected to the panelboard neutral bar for the ground fault equipment protection (GFEP) circuitry to function correctly.
How can I tell if the QOB340EPD has tripped due to a fault?
This breaker includes the Square D Visi-Trip indicator. When the breaker trips, the handle moves to a center position and a highly visible red flag appears in the indicator window, allowing for rapid identification of the tripped circuit.
What is the difference between the QOB340EPD and the QO340EPD?
The QOB340EPD features a bolt-on connection for NQ and NQOD panelboards, while the QO340EPD has a plug-on connection for standard QO load centers. Their electrical ratings and 30mA equipment protection capabilities are identical.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 206 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
206 reviews
- KHKristopher H.Verified BuyerReviewingSquare D QOB120GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/28/26Great Price!
Great price. Fast delivery. My local electric distributor wanted double for the same breaker, so it was a no brainer to order this one. Ordered another one since with the same great service.
- 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.