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Square D QO350SWN Miniature Circuit Breaker
- 50A
- 3 Pole
- Plug-On
Square D
QO350SWN
Miniature Circuit Breaker
Brand
Square D
SKU
QO350SWN
Quantity
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Square D QO350SWN - 50A 3 Pole Miniature Circuit Breaker
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Description
Part of the Square D QO series, the QO350SWN provides 50A of thermal-magnetic protection with a switched neutral function. It is ideal for commercial applications requiring simultaneous disconnection of hot and neutral conductors. This three-pole breaker installs into standard QO load centers and NQ panelboards. The plug-on design ensures a secure connection, accepting 8-2 AWG wire. Rated for 10kAIC at 120/240VAC, it features the Visi-Trip indicator to quickly identify tripped circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO350SWN |
| Series | QO |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 120/240VAC |
| 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 | Switch Neutral (Factory Included) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Common Trip, Mercury Free, RoHS Compliant |
| Special Features | Switching Neutral |
Product FAQs
6 answersWhat does the SWN suffix indicate on the QO350SWN?
The SWN suffix designates this as a Switched Neutral circuit breaker. It is designed to simultaneously disconnect all ungrounded conductors and the grounded neutral conductor. This is often required by the National Electrical Code (NEC) for specialized applications, such as fuel dispensing equipment, to ensure complete electrical isolation during maintenance.
Which load centers and panelboards are compatible with this breaker?
The QO350SWN is designed for use in Square D QO load centers, NQ panelboards, and legacy NQOD panelboards. It features a plug-on mounting style and will not fit in Homeline or I-Line panels.
How many panel spaces does this breaker occupy?
As a 3-pole QO series circuit breaker, it requires three standard 3/4-inch pole spaces in a compatible load center or panelboard.
Can I substitute a standard 3-pole QO breaker for the QO350SWN?
No. If your installation requires a switched neutral to comply with NEC codes, a standard 3-pole breaker cannot be used. Standard breakers only disconnect the ungrounded hot conductors and leave the neutral connected, which violates safety requirements for these specific applications.
Does this circuit breaker include a Visi-Trip indicator?
Yes, it features the Square D Visi-Trip indicator. When the breaker trips due to an overload or short circuit, the handle moves to a center position and a red indicator window appears, allowing for quick identification of the tripped circuit.
How does the thermal-magnetic trip mechanism operate on this breaker?
The breaker uses a fixed thermal-magnetic trip unit with long-time and instantaneous (LI) functions. The thermal element provides a delayed trip for sustained overloads, while the magnetic element trips instantaneously in the event of a short circuit.
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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