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Eaton / Cutler-Hammer FDB2040L Molded Case Circuit Breaker
- 40A
- 2 Pole
- Unit Mount
Eaton / Cutler-Hammer
FDB2040L
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
FDB2040L
Quantity
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Eaton / Cutler-Hammer FDB2040L - 40A 2 Pole Molded Case Circuit Breaker
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Description
Engineered for industrial power distribution, the Eaton FDB2040L is a 2-pole, 40A molded case circuit breaker from the proven Series C family. It delivers robust thermal-magnetic protection with fixed long-time and instantaneous (LI) trip functions. Designed for unit mount applications, this F-Frame breaker installs into Eaton enclosures, switchboards, and motor control centers. It features a 14 kAIC rating at 480VAC, making it an excellent choice for demanding commercial environments.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | FDB2040L |
| Series | FDB |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton F-Frame Enclosures, Switchboards, Motor Control Centers |
| Wire Gauge | 14 AWG - 1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, HID Rated, Non-Interchangeable Trip |
Product FAQs
6 answersWhat does the "L" in the FDB2040L catalog number indicate?
The "L" suffix indicates that the circuit breaker comes complete with factory-installed line and load lugs.
Can I install the FDB2040L in a standard loadcenter?
No, the FDB2040L is a unit-mount, bolt-on F-Frame breaker designed for industrial switchboards, motor control centers, and specific F-Frame enclosures. It is not compatible with standard residential plug-on or bolt-on loadcenters like Type BR or Type CH.
How is the FDB2040L wired for 250VDC applications?
While rated for 250VDC at 10kAIC, DC applications often require multiple poles to be wired in series to safely break the DC arc. The specific wiring configuration depends on whether the system is grounded or ungrounded. Always consult Eaton's DC application guidelines and local codes.
Can the FDB2040L be reverse fed?
Yes, standard Eaton FDB thermal-magnetic breakers can be reverse fed (back-fed) as long as they do not have factory "Line" and "Load" markings. When used to back-feed a panel, a retaining bracket or hold-down kit must be installed to secure the breaker per NEC requirements.
Does the FDB2040L provide ground fault or arc fault protection?
No, this is a standard thermal-magnetic circuit breaker equipped with fixed long-time and instantaneous (LI) trip functions. It does not provide GFCI or AFCI protection.
What is the torque specification for the lugs on the FDB2040L?
For the standard 14 AWG to 1/0 AWG lugs, the required torque depends on the wire size. Typically, 14 to 10 AWG requires 35 lb-in, 8 AWG requires 40 lb-in, 6 to 4 AWG requires 45 lb-in, and 3 to 1/0 AWG requires 50 lb-in. Always verify the exact torque values printed on the breaker nameplate or lug before terminating.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
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Rating
2 reviews
- BBrentVerified BuyerReviewingEaton / Cutler-Hammer FDB3060 - 60A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Breaker was as expected.
Breaker was clean, you could not tell it was used.
- RFRussell F.Verified BuyerReviewingEaton / Cutler-Hammer FDB3025 - 25A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/24/26Right product, right time
This is what I needed, and I got it in time.