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Square D QOB330EPD GFEP Miniature Circuit Breaker
- 30A
- 3 Pole
- Bolt-On
Square D
QOB330EPD
GFEP Miniature Circuit Breaker
Brand
Square D
SKU
QOB330EPD
Quantity
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Square D QOB330EPD - 30A GFEP Miniature Circuit Breaker
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Description
Engineered for commercial and industrial applications, this 30A three-pole GFEP device provides essential 30mA equipment-level ground fault protection. It installs securely into Square D NQ and NQOD panelboards via a standard bolt-on connection, ensuring reliable performance in demanding environments. Featuring a 10kAIC rating at 240VAC and the signature Visi-Trip indicator, maintenance personnel can quickly identify tripped circuits to minimize costly operational downtime.Specifications
| Brand | Square D |
|---|---|
| Part Number | QOB330EPD |
| Series | QOB |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | QOB |
|---|---|
| Terminal Type | Pressure Plate |
| 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 | Handle Padlock Attachment |
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Ground Fault Protection |
Product FAQs
6 answersWhich panelboards are compatible with the QOB330EPD?
This bolt-on circuit breaker is designed exclusively for use in Square D NQ and NQOD panelboards. It will not fit in standard QO load centers that require plug-on breakers.
What does the EPD designation mean on this breaker?
EPD stands for Equipment Protection Device. It provides a 30 mA ground fault trip threshold, known as Class B protection, designed to protect equipment from damaging line-to-ground faults rather than providing personnel protection.
How does a 30 mA EPD breaker differ from a standard GFCI?
A standard Class A GFCI trips at 5 mA to protect personnel from electric shock. This Class B EPD breaker trips at 30 mA and is intended to protect equipment, such as heat trace cables or industrial machinery, from ground faults without nuisance tripping.
How many panel spaces does the QOB330EPD require?
As a 3-pole breaker, it requires three standard 0.75-inch spaces in a compatible NQ or NQOD panelboard.
How is the neutral connected on this breaker?
This breaker features a pigtail neutral wire that must be wired directly to the panelboard neutral bar. This connection is required to power the internal ground fault monitoring circuitry, even if the 240V load does not use a neutral.
Does this breaker include a tripped status indicator?
Yes, it features the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or ground fault, the handle snaps to a center position and a highly visible red indicator appears.
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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.