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Square D FDA34040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Square D
FDA34040
Molded Case Circuit Breaker
Brand
Square D
SKU
FDA34040
Quantity
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Square D FDA34040 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial and industrial environments, the FDA34040 provides reliable thermal-magnetic protection for three-phase systems. This 40A molded case circuit breaker features fixed long-time and instantaneous (LI) trip functions. Designed for Square D I-Line panelboards, the unit utilizes a plug-on mounting style. It serves as an exact replacement for older F-Frame installations and is superseded by the modern HDA36040. Rated 18kAIC at 480VAC, it includes a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | FDA34040-R |
| Series | FDA |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480Y/277VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-1/0 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat type of panelboards accept the FDA34040 breaker?
This breaker is designed specifically for Square D I-Line panelboards and switchboards. It utilizes a plug-on line-side connection that mounts directly to the I-Line bus stack.
Is the FDA34040 F-Frame breaker obsolete, and what is the current replacement?
Yes, Square D has phased out the legacy F-Frame series. The modern direct replacement is the PowerPact H-Frame HDA36040, which provides the same 40A rating, 3-pole configuration, and I-Line mounting.
How is the FDA34040 installed in a panel?
It features an I-Line mounting style. The line side plugs directly onto the panelboard bus, while the load side uses mechanical lugs to terminate the wiring.
What does the LI trip function indicate on this molded case circuit breaker?
The LI designation means the breaker is equipped with thermal-magnetic protection featuring Long-Time (thermal overload) and Instantaneous (magnetic short-circuit) trip functions. On the FDA34040, these trip thresholds are fixed and non-adjustable.
How can I visually identify if the FDA34040 has tripped?
This breaker includes a Visi-Trip indicator. When a fault occurs, the operating handle moves to a center position and a red flag appears in the indicator window, allowing for quick identification of the tripped circuit.
Can the FDA34040 be used in DC applications?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC applications with a 10kA interrupting capacity, making it suitable for specific industrial DC control or distribution circuits.
What wire sizes and materials are compatible with the load lugs on the FDA34040?
The factory-installed load lugs accept wire gauges ranging from 14 AWG to 1/0 AWG. The lugs are dual-rated for use with either copper (Cu) or aluminum (Al) conductors.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
2 reviews
- DNDan N.Verified BuyerReviewingSquare D FDA34030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/8/26Used Breaker
Shipped and arrived timely, well packaged, was clean and in good used condition. Outside putting it into service all has a appears to be good.
- EBErich B.Verified BuyerReviewingSquare D FDA34020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/18/25Great service
Always super easy to deal with