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Square D QO240H Miniature Circuit Breaker
- 40A
- 2 Pole
- Plug-On
Square D
QO240H
Miniature Circuit Breaker
Brand
Square D
SKU
QO240H
Quantity
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Square D QO240H - 40A 2 Pole Miniature Circuit Breaker
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Description
Providing essential overload and short-circuit protection, the Square D QO240H is a 40A, two-pole miniature breaker. It is commonly utilized in residential and commercial settings for heavy-duty appliances like ranges and HVAC equipment. This unit installs into standard QO load centers and NQ panelboards using a simple plug-on connection. Note that this specific part number has been superseded by the standard QO240, making it a direct cross-reference for existing panel maintenance.Specifications
| Brand | Square D |
|---|---|
| Part Number | QO240H |
| Series | QO |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120VAC, 10kA @ 240VAC, 10kA @ 120/240VAC |
| Frame Type | QO |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards |
| Wire Gauge | 8-2 AWG (Cu/Al) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Common Trip |
Product FAQs
7 answersCan I install the QO240H in a Square D Homeline panel?
No, the QO240H is designed exclusively for Square D QO load centers and NQ panelboards. It is not interchangeable with Homeline panels, which require HOM series breakers.
Is the QO240H still manufactured, or is there a direct replacement?
The QO240H has been superseded by the standard Square D QO240. The QO240 serves as a direct cross-reference and drop-in replacement for existing panel maintenance.
What is the recommended terminal torque for the QO240H?
The box lugs on the QO240H accept 8 AWG to 2 AWG copper or aluminum wire and should be tightened to a torque of 44.25 lb-in (5 N-m) for a secure and safe connection.
Can I use the QO240H in a panel that requires a 22kAIC interrupting rating?
No, the QO240H has a maximum interrupting rating of 10kAIC at 120/240VAC. If your system requires a 22kAIC rating, you will need a QO-VH series breaker, such as the QO240VH.
Is the QO240H a plug-on or bolt-on breaker?
The QO240H is a plug-on circuit breaker that snaps directly onto the bus bar. If your panel requires a bolt-on connection, you will need the equivalent QOB series breaker, such as the QOB240.
Does the QO240H feature a tripped circuit indicator?
Yes, this breaker includes the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or short circuit, a highly visible red flag appears in the indicator window to help quickly identify the faulted circuit.
Is the QO240H suitable for HVAC equipment?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires a 40-amp, two-pole 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