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Eaton S501-400-R Fast-Acting Fuse 400 mA 250 Vac - 5 x 20 mm
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pEaton S501-400-R — 400 mA, 250 V, fast-acting fuse, 5 x 20 mm, 1,500 A at 250 Vac interrupting./p
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Eaton S501-400-R Fast-Acting Fuse 400 mA 250 Vac - 5 x 20 mm
Built by Eaton, the S501-400-R carries 400 mA, rated 250 Vac, uses a fast-acting element, measuring 5 x 20 mm.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | S501-400-R |
| Breaking capacity | 1,500 A at 250 Vac across the whole range |
| Body | Ceramic tube, 5 x 20 mm |
| Design standard | IEC 60127-2 |
| Voltage rating | 250 Vac |
| End caps | silver-plated 50-400 mA, nickel-plated 500 mA-10 A |
| Typical melting I2t | 0.018 A²s |
| Maximum voltage drop | 1,200 mV |
| Typical DC cold resistance | 2.2 Ω |
| Element | single element |
| Rated current | 400 mA |
| AC interrupting rating | 1,500 A at 250 Vac |
Selection Notes
- Interrupting capability is 1,500 A at 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.
- Footprint 5 x 20 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 400 mA to stop nuisance trips — fix the cause instead.
Typical Applications
Engineers usually specify it for these duties:
- EV
Q&A
What are the ratings of the S501-400-R?
400 mA continuous at 250 Vac, interrupting rating 1,500 A at 250 Vac.
Is the S501-400-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
What size is the S501-400-R?
It measures 5 x 20 mm. Match the holder or clip to this footprint.
Can the S501-400-R be used on a higher fault-current circuit?
No — its interrupting rating is 1,500 A at 250 Vac. Choose a part whose breaking capacity exceeds the prospective fault current.
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