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Square D QO350EPD GFEP Miniature Circuit Breaker
- 50A
- 3 Pole
- Plug-On
Square D
QO350EPD
GFEP Miniature Circuit Breaker
Brand
Square D
SKU
QO350EPD
Quantity
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Square D QO350EPD - 50A GFEP Miniature Circuit Breaker
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Description
Part of the renowned QO series, this 50A three-pole breaker delivers specialized 30mA equipment ground fault protection. It mounts effortlessly into compatible Square D NQ panelboards and standard QO load centers without requiring specialized hardware. Designed with a mercury-free construction and the classic Visi-Trip window, this 10kAIC rated device provides robust thermal-magnetic defense for demanding industrial environments.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO350EPD |
| Series | QO |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | QO Load Centers, NQ 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 Thermal, Fixed Magnetic |
| Special Classification | GFEP |
|---|---|
| Available Options | Padlock Attachment, Handle Tie |
| Standards | CSA C22.2 No. 5, UL 489, UL 1053 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Mercury Free, RoHS Compliant |
Product FAQs
6 answersWhat panels are compatible with the QO350EPD circuit breaker?
This plug-on breaker is designed for use in Square D QO load centers and NQ panelboards. Because it is a 3-pole breaker, it requires a 3-phase panel and occupies three spaces.
Can I use the QO350EPD in a single-phase residential panel?
No. This is a 3-pole breaker that requires three phases to operate properly. It will not fit or function correctly in a standard single-phase load center.
What is the ground fault trip level for this EPD breaker?
The QO350EPD features a 30mA ground fault trip level (Class B) designed for equipment protection. It is not a Class A 5mA GFCI breaker intended for personnel protection.
How is the neutral connected on the QO350EPD?
This breaker includes a pigtail neutral wire. The pigtail must be connected directly to the neutral bar in the panelboard for the ground fault equipment protection to function correctly.
What is the recommended tightening torque for the box lugs on the QO350EPD?
The recommended tightening torque for the box lugs is 40.7 lbf-in (4.6 N.m) for the accepted wire range of 14 to 6 AWG copper or 12 to 4 AWG aluminum.
Is there a bolt-on equivalent for the QO350EPD?
Yes, the QOB350EPD is the bolt-on version of this breaker, designed for use in Square D NQ and NQOD panelboards.
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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 285 reviews.
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 6/13/26
Customers say these circuit breakers arrive quickly and work as described. Fast shipping and competitive pricing are frequently mentioned, with many noting same-day or next-day delivery. Users appreciate the wide inventory, particularly for hard-to-find older-style models unavailable locally. The products function reliably and arrive in good condition. Most customers report straightforward ordering and positive interactions. However, some experienced delivery delays or received incorrect items requiring reordering. A few noted concerns about condition upon arrival or customer service responsiveness.
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Rating
285 reviews
- GCGerard C.Verified BuyerReviewingSquare D QO130GFI - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/21/26Great !
I could not find the breaker in hardwood stores. Superbreakers took car of it in a week.
- RHRoy H.Verified BuyerReviewingSquare D QO280 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/17/26Square D QO280 - 80A 2 Pole Miniature Circuit Breaker
Exactly as described
- KWKevin W.Verified BuyerReviewingSquare D QO120 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/15/26Great Price
Brand spanking new!
- CEchristopher e.Verified BuyerReviewingSquare D QO115PDF - 15A Dual Function Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26My breakers
Had a hard time locating these breakers locally, when I did find 1 they wanted to charge me triple what superbreakers charged. Items delivered exactly when they said they would, were exactly what I ordered. Appreciated the ease of ordering, definitely my go to from this point on
- JCJerry C.Verified BuyerReviewingSquare D QO250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/8/26Great quality
No issues