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Eaton S501-50-R 50 mA 250 Vac Fast-Acting Ceramic Fuse
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pEaton S501-50-R — 50 mA, 250 V, fast-acting ceramic cartridge fuse, 1,500 A at 250 Vac interrupting./p
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Eaton S501-50-R 50 mA 250 Vac Fast-Acting Ceramic Fuse
Built by Eaton, the S501-50-R carries 50 mA, rated 250 Vac, uses a fast-acting element, in a ceramic body.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | S501-50-R |
| Rated current | 50 mA |
| Typical melting I2t | 0.0017 A²s |
| Maximum voltage drop | 9,000 mV |
| Voltage rating | 250 Vac |
| Breaking capacity | 1,500 A at 250 Vac across the whole range |
| Body | Ceramic tube, 5 x 20 mm |
| Typical DC cold resistance | 157.5 Ω |
| End caps | silver-plated 50-400 mA, nickel-plated 500 mA-10 A |
| Design standard | IEC 60127-2 |
| Element | single element |
| 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.
- Ceramic body holds higher breaking capacity than glass at the same footprint.
- It is the usual choice where prospective fault current is high.
- Working voltage must stay at or below 250 Vac; a lower-rated part is not a safe substitute.
- Do not upsize beyond 50 mA to stop nuisance trips — fix the cause instead.
Typical Applications
Engineers usually specify it for these duties:
- EV
- transformer
Q&A
What are the ratings of the S501-50-R?
50 mA continuous at 250 Vac, interrupting rating 1,500 A at 250 Vac.
Is the S501-50-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the S501-50-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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