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Square D QO340VH Miniature Circuit Breaker
- 40A
- 3 Pole
- Plug-On
Square D
QO340VH
Miniature Circuit Breaker
Brand
Square D
SKU
QO340VH
Quantity
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Square D QO340VH - 40A 3 Pole Miniature Circuit Breaker
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Description
Part of the QO series, the Square D QO340VH is a 40-amp, three-pole miniature circuit breaker designed for residential, commercial, and industrial applications. It provides robust thermal-magnetic overcurrent protection for 240VAC electrical systems. This breaker snaps securely into standard Square D QO load centers and NQ panelboards. Differentiating itself with a high interrupting capacity of 22kAIC, it also includes the Visi-Trip indicator to quickly identify tripped circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO340VH |
| Series | QO |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 22kA @ 240VAC, 22kA @ 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 |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, High Interrupting Capacity, Mercury Free, RoHS Compliant |
Product FAQs
7 answersWhat panels are compatible with the QO340VH?
This breaker is designed for use in 3-phase Square D QO load centers and NQ panelboards. It features a plug-on mounting style and will not fit in panels designed exclusively for bolt-on breakers.
What does the VH suffix indicate on the QO340VH?
The VH suffix designates a high interrupting rating of 22kAIC at 120/240VAC. Standard QO breakers without this suffix typically have a 10kAIC rating.
How many panel spaces does the QO340VH require?
This 3-pole breaker requires three standard 0.75-inch spaces in a compatible QO load center or NQ panelboard.
Can the QO340VH be installed in a single-phase panel?
No. As a 3-pole breaker, it is engineered specifically for 3-phase systems and will not mount properly or safely in a single-phase load center.
What is the difference between the QO340 and the QO340VH?
Both are 40A, 3-pole miniature circuit breakers, but they differ in short-circuit protection. The QO340 has a standard 10kAIC rating, while the QO340VH provides a 22kAIC rating for systems with higher available fault currents.
What is the bolt-on equivalent to the QO340VH?
The QOB340VH is the bolt-on version of this breaker. It shares the same 40A, 3-pole, and 22kAIC specifications but is designed for NQ panelboards that require bolt-on connections.
Does the QO340VH include a tripped circuit indicator?
Yes, it features the Square D Visi-Trip indicator. When the breaker trips, the handle snaps to a midpoint position and displays a highly visible red flag for quick identification in the panel.
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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