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Littelfuse 0443004.DR 4 A 443 time-lag (Slo-Blo) SMD Fuse
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pLittelfuse 0443004.DR — 4 A, 250 V, time-delay SMD fuse, 50 A @ 250 VAC; 100 A @ 125 VDC; 500 A @ 60 VDC interrupting./p
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Littelfuse 0443004.DR 4 A 443 time-lag (Slo-Blo) SMD Fuse
Littelfuse 0443004.DR 4 A 443 time-lag (Slo-Blo) SMD Fuse belongs to the Littelfuse range. It carries 4 A, rated 250 VAC, uses a time-delay element.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Manufacturer / Series | Littelfuse / 443 Series |
| Part number | 0443004.DR |
| Fuse characteristic | time-lag (Slo-Blo) |
| Rated current | 4 A |
| Voltage rating | 250 VAC |
| Interrupting rating | 50 A @ 250 VAC; 100 A @ 125 VDC; 500 A @ 60 VDC |
| Nominal cold resistance | 0.016 Ω |
| Nominal melting I²t | 122.5 A²s |
| Package | NANO2 high-voltage SMD (approx. 10.1 × 3.1 mm) |
| Operating temperature | -55 °C to +125 °C |
| Agency / environmental | UL Recognized, CSA Certified, IEC/EN 60127 compliant, RoHS compliant and halogen-free |
Design Notes
- Interrupting capability is 50 A @ 250 VAC; 100 A @ 125 VDC; 500 A @ 60 VDC — confirm the circuit's prospective fault current stays below this.
- Time-delay element rides through motor starting and capacitive inrush without nuisance opening.
- Startup surges of several times rated current are tolerated for a short window.
- 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.
Where It Is Used
Typical places this fuse turns up:
- EV
- telecom
- adapter
- lighting
Ordering Details
Order code 0443004.DR from Littelfuse, supplied in NANO2 high-voltage SMD (approx. 10.1 × 3.1 mm). Confirm the exact suffix before release.
Common Questions
What are the ratings of the 0443004.DR?
4 A continuous at 250 VAC, interrupting rating 50 A @ 250 VAC; 100 A @ 125 VDC; 500 A @ 60 VDC.
Is the 0443004.DR fast-acting or time-delay?
It is time-delay. It tolerates short inrush surges.
Can the 0443004.DR be used on a higher fault-current circuit?
No — its interrupting rating is 50 A @ 250 VAC; 100 A @ 125 VDC; 500 A @ 60 VDC. Choose a part whose breaking capacity exceeds the prospective fault current.
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