Eaton / Cutler-HammerQBHW2050S
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Free Shipping Over $99
Free Shipping Over $99
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Eaton / Cutler-Hammer QBHW2040S Miniature Circuit Breaker
- 40A
- 2 Pole
- Bolt-On
Eaton / Cutler-Hammer
QBHW2040S
Miniature Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
QBHW2040S
Quantity
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Eaton / Cutler-Hammer QBHW2040S - 40A 2 Pole Miniature Circuit Breaker
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Description
Built for commercial and industrial applications, the Eaton QBHW2040S is a 40A, 2-pole miniature circuit breaker from the Quicklag family. This unit mounts into Eaton Pow-R-Line 1a and 2a panelboards using a secure bolt-on connection, ensuring a stable, vibration-resistant installation. Rated at 22 kAIC at 120/240VAC, this model includes a factory-installed shunt trip for remote tripping capabilities. It is HACR rated and accepts 14-4 AWG wire.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | QBHW |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Frame Type | BAB |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Eaton Pow-R-Line 1a Panelboards, Eaton Pow-R-Line 2a Panelboards |
| Wire Gauge | 14-4 AWG |
| Max Wire | 4 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards are compatible with the QBHW2040S?
This breaker is designed for direct bolt-on installation in Eaton Pow-R-Line 1a and Pow-R-Line 2a panelboards. The bolt-on connection provides a secure, vibration-resistant mount for commercial and industrial applications.
What does the S suffix mean on the QBHW2040S?
The S suffix indicates that the breaker includes a factory-installed shunt trip for remote tripping capabilities. The shunt trip operates between 120V and 240V AC.
How many panel spaces are required to install this breaker?
While the QBHW2040S is a 2-pole breaker, the factory-installed shunt trip requires one additional pole space on the right side. You will need a total of three pole spaces in your panelboard.
Can I use the QBHW2040S in panels that only require a 10 kAIC rating?
Yes. While this breaker has a maximum interrupting capacity of 22 kAIC at 120/240V AC, it can be safely installed in systems requiring lower fault current protection, including 10 kAIC, 14 kAIC, and 18 kAIC applications.
What is the difference between QBHW and standard BAB breakers?
Both belong to the Eaton Quicklag family and share the same physical BAB frame size. The QBHW series provides a higher interrupting rating of 22 kAIC, whereas standard BAB breakers are rated at 10 kAIC.
How does the thermal-magnetic trip unit operate on this breaker?
The QBHW2040S uses a fixed thermal-magnetic mechanism with long-time and instantaneous (LI) functions. The thermal component provides delayed tripping for sustained overloads, while the magnetic component trips instantaneously during severe short circuits.
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Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 11 reviews.
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Rating
11 reviews
- CMCalvin M.Verified BuyerReviewingEaton / Cutler-Hammer QBHW2100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 4 out of 5 stars7/22/26SuperBreakers
SuperBreakers haven't disappointed me yet. They always have what I need and very timely deliveries!
- WJWilliam J.Verified BuyerReviewingEaton / Cutler-Hammer QBHW1020 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars4/2/26Emergency-Overnight Purchase and Delivery
I needed breaker ASAP and SuperBreakers made it happen!
- NSNathan S.Verified BuyerReviewingEaton / Cutler-Hammer QBHW2040S - 40A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars3/19/26Arrived Just in Time
Always satisfied with my SuperBreakers purchases!
- PMPete M.Verified BuyerReviewingEaton / Cutler-Hammer QBHW2015 - 15A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/12/25Great service and very helpful
Knowledgable staff, easy to use website. Quick shipping turnaround.
- BCBrian C.ReviewingEaton / Cutler-Hammer QBHW2020 - 20A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/9/23plug & play
Your website is very user friendly parts arrived promptly exact same parts no issues