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Eaton C520-250-R 250 mA 250 Vac Fast-Acting Glass Fuse
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pEaton C520-250-R — 250 mA, 250 V, fast-acting glass cartridge fuse, 35 A interrupting./p
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Eaton C520-250-R 250 mA 250 Vac Fast-Acting Glass Fuse
Eaton C520-250-R 250 mA 250 Vac Fast-Acting Glass Fuse belongs to the Eaton range. It carries 0.25 A, rated 250 Vac, uses a fast-acting element, in a glass body.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Manufacturer / Series | Eaton / C520 Series |
| Orderable part number | C520-250-R (carton codes BK-C520-250-R / BK1-C520-250-R) |
| Current rating | 0.25 A |
| Voltage rating | 250 Vac |
| Interrupting rating @ 250 Vac | 35 A |
| Interrupting rating @ 125 Vac | 10,000 A |
| Typical DC cold resistance | 5.60 Ohm |
| Typical melting I2t | 0.012 A2s |
| Typical voltage drop | 1450 mV |
| Package | 5 x 14.48 mm glass tube (5 x 15 mm nominal), nickel-plated brass end caps |
| Body length | 14.48 mm (nominal 5 x 15 mm class) |
| Agency / environmental | UL Listed guide JDYX file E19180; CSA certification class 1422-01 file 53787; UL Listed to UL 248-14; RoHS compliant |
Design Notes
- Interrupting capability is 35 A — 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.
- Glass body lets you inspect the element after a fault.
- Best kept for lower fault-current circuits where visual diagnosis matters.
- Working voltage must stay at or below 250 Vac; a lower-rated part is not a safe substitute.
- Do not upsize beyond 0.25 A to stop nuisance trips — fix the cause instead.
Where It Is Used
Typical places this fuse turns up:
- transformer
Ordering Details
Order code C520-250-R from Eaton, supplied in 5 x 14.48 mm glass tube (5 x 15 mm nominal), nickel-plated brass end caps. Confirm the exact suffix before release.
Common Questions
What are the ratings of the C520-250-R?
0.25 A continuous at 250 Vac, interrupting rating 35 A.
Is the C520-250-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the C520-250-R be used on a higher fault-current circuit?
No — its interrupting rating is 35 A. Choose a part whose breaking capacity exceeds the prospective fault current.
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