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Square D QO350 Miniature Circuit Breaker
- 50A
- 3 Pole
- Plug-On
Square D
QO350
Miniature Circuit Breaker
Brand
Square D
SKU
QO350
Quantity
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Square D QO350 - 50A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Square D QO350 - 50A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | QO350 |
| Series | QO |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QO |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | None included |
| Standards | UL 489, CSA C22.2 No. 5, HACR, RoHS, REACh |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Mercury Free, RoHS Compliant |
Sold out
Quantity
Square D QO350 - 50A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | QO350-R |
| Series | QO |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QO |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | None included |
| Standards | UL 489, CSA C22.2 No. 5, HACR, RoHS, REACh |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Mercury Free, RoHS Compliant |
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Description
Built for residential and commercial applications, the QO350 provides robust overcurrent protection. This 50A, three-pole miniature circuit breaker features a standard 10kAIC rating at 240VAC to safeguard electrical systems. The plug-on design installs seamlessly into Square D QO load centers and NQ panelboards. It accepts 8-2 AWG wire via standard box lugs. Equipped with the exclusive Visi-Trip indicator, this HACR-rated breaker allows users to quickly identify tripped circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO350 |
| Series | QO |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Frame Type | QO |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 8-2 AWG (Al/Cu) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment, Handle Tie |
|---|---|
| Accessories | None included |
| Standards | UL 489, CSA C22.2 No. 5, HACR, RoHS, REACh |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Mercury Free, RoHS Compliant |
Product FAQs
6 answersWhat load centers and panels will accept the QO350 breaker?
This breaker mounts directly into Square D QO load centers and NQ panelboards. Because it is a plug-on breaker, ensure your NQ panel interior is configured to accept plug-on branch breakers rather than bolt-on variants.
How many panel spaces are required for installation?
As a three-pole breaker, it requires three standard 3/4-inch panel spaces in a compatible load center or panelboard.
What is the recommended tightening torque for the terminal lugs?
The box lugs should be tightened to 44.3 lb-in (5 N.m) for proper and secure connection of the 8 to 2 AWG conductors.
Is there a bolt-on equivalent available for this breaker?
Yes, the direct bolt-on equivalent is catalog number QOB350. It provides the exact same electrical ratings but is designed to bolt directly to the panelboard busbar for applications requiring a permanent mounting style.
Does this breaker feature a visual trip indicator?
Yes, it is equipped with the standard Square D Visi-Trip indicator. When the breaker trips, the handle moves to a center position and a bright red flag appears in the indicator window, making it easy to identify the tripped circuit.
Is the QO350 approved for heating and cooling equipment?
Yes, it is HACR rated, meaning it is certified for compatibility with heating, air conditioning, and refrigeration equipment loads.
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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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All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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