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Eaton 1025FA4-R Fast-Acting Fuse 4 A 250 Vac - 10.29 x 2.77 mm
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pEaton 1025FA4-R — 4 A, 250 V, fast-acting fuse, 10.29 x 2.77 mm, 50 A AC; 50 A 125 Vdc interrupting./p
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Eaton 1025FA4-R Fast-Acting Fuse 4 A 250 Vac - 10.29 x 2.77 mm
Built by Eaton, the 1025FA4-R carries 4 A, rated 250 Vac, uses a fast-acting element, measuring 29 x 2.77 mm.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | 1025FA4-R |
| Ordering code | TR2/1025FA4-R |
| Packaging | 2,500 pcs on 24 mm tape-and-reel, 13 in (330 mm) reel, EIA-481 |
| Typical cold resistance | 0.0275 Ω |
| Voltage rating | 250 Vac |
| Typical voltage drop | 190 mV |
| Typical melting I2t | 23.32 A²s |
| Voltage rating, DC | 125 Vdc |
| Package | 10.29 x 2.77 mm (4010 imperial / 1025 metric) |
| Interrupting rating | 50 A AC; 50 A 125 Vdc |
| Design standard | EIA/IS-722 |
| Rated current | 4 A |
| Agency approval | UL Recognition, Guide JDYX2, File E19180 (250 mA - 15 A); CSA component acceptance |
| Terminations | silver-plated end terminations, solder immersion compatible |
Selection Notes
- Interrupting capability is 50 A AC; 50 A 125 Vdc — confirm the circuit's prospective fault current stays below this.
- Fast element suits resistive and semiconductor loads rather than motors with high inrush.
- Because it opens within milliseconds, downstream semiconductors see less let-through energy.
- Footprint 29 x 2.77 mm — check clip or holder compatibility before substitution.
- Working voltage must stay at or below 250 Vac; a lower-rated part is not a safe substitute.
- Do not upsize beyond 4 A to stop nuisance trips — fix the cause instead.
Typical Applications
Engineers usually specify it for these duties:
- EV
- surge
Part Number and Packing
Order code 1025FA4-R from Eaton, supplied in 10.29 x 2.77 mm (4010 imperial / 1025 metric). Confirm the exact suffix before release.
Q&A
What are the ratings of the 1025FA4-R?
4 A continuous at 250 Vac, interrupting rating 50 A AC; 50 A 125 Vdc.
Is the 1025FA4-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
What size is the 1025FA4-R?
It measures 29 x 2.77 mm. Match the holder or clip to this footprint.
Can the 1025FA4-R be used on a higher fault-current circuit?
No — its interrupting rating is 50 A AC; 50 A 125 Vdc. Choose a part whose breaking capacity exceeds the prospective fault current.
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