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Littelfuse 04643.15DR 3.15 A 464 fast-acting SMD Fuse
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pLittelfuse 04643.15DR — 3.15 A, 250 V, fast-acting SMD fuse, 100 A @ 250 VAC interrupting./p
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Littelfuse 04643.15DR 3.15 A 464 fast-acting SMD Fuse
Built by Littelfuse, the 04643.15DR carries 3.15 A, rated 250 VAC, uses a fast-acting element.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Manufacturer / Series | Littelfuse / 464 Series |
| Part number | 04643.15DR |
| Fuse characteristic | fast-acting |
| Rated current | 3.15 A |
| Voltage rating | 250 VAC |
| Interrupting rating | 100 A @ 250 VAC |
| Nominal cold resistance | 0.0206 Ω |
| Nominal melting I²t | 8.05 A²s |
| Package | 12.1 × 4.5 mm NANO2 UMF |
| Operating temperature | -55 °C to +125 °C |
| Agency / environmental | IEC 60127-4 UMF, PSE/UL approvals by rating, RoHS compliant and halogen-free |
Selection Notes
- Interrupting capability is 100 A @ 250 VAC — 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.
- Working voltage must stay at or below 250 VAC; a lower-rated part is not a safe substitute.
- Do not upsize beyond 3.15 A to stop nuisance trips — fix the cause instead.
Typical Applications
Engineers usually specify it for these duties:
- EV
- lighting
Part Number and Packing
Order code 04643.15DR from Littelfuse, supplied in 12.1 × 4.5 mm NANO2 UMF. Confirm the exact suffix before release.
Q&A
What are the ratings of the 04643.15DR?
3.15 A continuous at 250 VAC, interrupting rating 100 A @ 250 VAC.
Is the 04643.15DR fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the 04643.15DR be used on a higher fault-current circuit?
No — its interrupting rating is 100 A @ 250 VAC. Choose a part whose breaking capacity exceeds the prospective fault current.
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