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Eaton C520-4-R 4 A 250 Vac Fast-Acting Glass Fuse
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pEaton C520-4-R — 4 A, 250 V, fast-acting glass cartridge fuse, 200 A interrupting./p
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Eaton C520-4-R 4 A 250 Vac Fast-Acting Glass Fuse
Eaton C520-4-R 4 A 250 Vac Fast-Acting Glass Fuse belongs to the Eaton range. It carries 4 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 | C520-4-R (carton codes BK-C520-4-R / BK1-C520-4-R) |
| Current rating | 4 A |
| Voltage rating | 250 Vac |
| Interrupting rating @ 250 Vac | 200 A |
| Interrupting rating @ 125 Vac | 10,000 A |
| Typical DC cold resistance | 0.022 Ohm |
| Typical melting I2t | 16.6 A2s |
| Typical voltage drop | 88 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 200 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 4 A to stop nuisance trips — fix the cause instead.
Where It Is Used
Typical places this fuse turns up:
- lighting
- LED driver
Ordering Details
Order code C520-4-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 C520-4-R?
4 A continuous at 250 Vac, interrupting rating 200 A.
Is the C520-4-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the C520-4-R be used on a higher fault-current circuit?
No — its interrupting rating is 200 A. Choose a part whose breaking capacity exceeds the prospective fault current.
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