Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Free Shipping Over $99
Siemens Q24040 CT2 - 40A Quadplex Miniature Circuit Breaker
- 40A
- 4 Pole
- Plug-On
Siemens
Q24040
CT2 - 40A Quadplex Miniature Circuit Breaker
Brand
Siemens
SKU
Q24040
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Siemens Q24040CT2 - 40A Quadplex Miniature Circuit Breaker
New
Quantity
Quantity
Siemens Q24040CT2 - 40A Quadplex Miniature Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q24040 |
| Series | QT |
| Amperage | 40A |
| Poles | 4 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, EQ Load Centers, Ultimate Load Centers, PL Series Load Centers, ES Series Load Centers |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Special Classification | Quadplex |
|---|---|
| Available Options | Padlock Attachment |
| Standards | HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Space Saver, HACR Rated, Common Trip |
Sold out
Quantity
Siemens Q24040CT2 - 40A Quadplex Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q24040-R |
| Series | QT |
| Amperage | 40A |
| Poles | 4 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, EQ Load Centers, Ultimate Load Centers, PL Series Load Centers, ES Series Load Centers |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Special Classification | Quadplex |
|---|---|
| Available Options | Padlock Attachment |
| Standards | HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Space Saver, HACR Rated, Common Trip |
Similar Items
15/40A Quadplex Miniature Circuit Breaker
20/50A Quadplex Miniature Circuit Breaker
CT2 - 30/30A Quadplex Miniature Circuit Breaker
Description
Built to optimize residential panel space, the Siemens Q24040 is a quadplex breaker that provides two independent 40A circuits. By condensing four poles of protection into a two-pole footprint, it allows for system expansion without requiring a larger enclosure upgrade. This plug-on miniature breaker mounts into Siemens EQ, Ultimate, PL, and ES series load centers. It is replaced by the newer Q24040CT2 model. Rated for 10kA at 120/240VAC, it includes common trip functionality for both pairs.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q24040 |
| Series | QT |
| Amperage | 40A |
| Poles | 4 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, EQ Load Centers, Ultimate Load Centers, PL Series Load Centers, ES Series Load Centers |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Special Classification | Quadplex |
|---|---|
| Available Options | Padlock Attachment |
| Standards | HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Space Saver, HACR Rated, Common Trip |
Product FAQs
7 answersWhich load centers are compatible with the Siemens Q24040 quad breaker?
This plug-on breaker mounts into Siemens EQ, Ultimate, PL, and ES series load centers. Your specific panel must be rated to accept CTL-type QT breakers, which can be verified on the enclosure's wiring diagram.
Are the Q24040 and Q24040CT2 the same breaker?
Yes, Q24040CT2 is the current catalog number for the Q24040. Both refer to the exact same Siemens 40/40A quadplex circuit breaker.
How much panel space does this quadplex breaker require?
The Q24040 requires two standard 1-inch panel spaces (2 inches total). By condensing four poles into a two-pole footprint, it provides two independent 40A 240V circuits without needing a larger enclosure.
Does this breaker feature common trip functionality?
Yes, it features internal common trip mechanisms for both 40A double-pole pairs. This ensures that both legs of the connected 240V circuit will trip simultaneously during an overload or short circuit.
Is the Siemens Q24040 suitable for HVAC applications?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires a 40A circuit.
What wire sizes can be used with the Q24040 terminals?
The breaker lugs accept 8 to 6 AWG copper wire or 8 to 4 AWG aluminum wire. Always torque the connections to the manufacturer specifications printed on the breaker.
What type of protection does the Q24040 provide?
It utilizes thermal-magnetic trip technology to provide both long-time overload protection and instantaneous short-circuit protection for your branch circuits.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
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.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
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 5.0 out of 5 based on 4 reviews.
Total 5 star reviews: 4 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Search
Rating
4 reviews
- JFJesus F.Verified BuyerRated 5 out of 5 stars7/28/25I need AC power
One of 2 circuits was damaged per corrosion. Installed new CB, fit up was exact and issue was rectified. CB arrived as promised, very reasonably priced and easy to find online.
- RCRod C.Rated 5 out of 5 stars3/10/21It's a contactor...
Fast delivery. Good packaging. Good description, so I got what I wanted. ...and, they work.
What more could you ask for?
...not to mention SuperBreakers were the only ones to actually have stock, and at a slight to drastic cost reduction depending on who I compared them to.
- ALAlan L.Rated 5 out of 5 stars10/21/18Hard to Find Breaker
I had a particularly hard to find breaker, a tandem double pole 40A x 40A.
Lowes and Menards didn't have them so I went online and Superbreakers showed just what I needed in stock at a very reasonable price too. It's installed. May breaker panel has one slot with a non-tandem breaker remaining. Gee! I wonder if Superbreakers.net has triple-breakers?
- JTJonathan T.Rated 5 out of 5 stars10/11/17Perfect solution to my home charging
Purchased this for the circuit panel for increasing the space. Worked perfectly.