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S500-400-R Eaton 400 mA Quick-Blow Glass Fuse 250 Vac
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pEaton S500-400-R — 400 mA, 250 V, fast-acting glass cartridge fuse, 35 A at 250 Vac interrupting./p
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S500-400-R Eaton 400 mA Quick-Blow Glass Fuse 250 Vac
S500-400-R Eaton 400 mA Quick-Blow Glass Fuse 250 Vac belongs to the the maker range. It carries 400 mA, rated 250 Vac, in a glass body.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | S500-400-R |
| Typical DC cold resistance | 1.95 Ω |
| Typical melting I2t | 0.18 A²s |
| End caps | silver-plated 32-125 mA, nickel-plated above |
| Maximum voltage drop | 1,100 mV |
| Design standard | IEC 60127-2 |
| Breaking capacity | 35 A at 250 Vac, 290 A and 1,500 A on the higher ratings |
| Voltage rating | 250 Vac |
| Body | Glass tube, 5 x 20 mm |
| AC interrupting rating | 35 A at 250 Vac |
| Element | single element |
| Rated current | 400 mA |
Design Notes
- Interrupting capability is 35 A at 250 Vac — confirm the circuit's prospective fault current stays below this.
- 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 400 mA to stop nuisance trips — fix the cause instead.
Where It Is Used
Typical places this fuse turns up:
- EV
- surge
Common Questions
What are the ratings of the S500-400-R?
400 mA continuous at 250 Vac, interrupting rating 35 A at 250 Vac.
Can the S500-400-R be used on a higher fault-current circuit?
No — its interrupting rating is 35 A at 250 Vac. Choose a part whose breaking capacity exceeds the prospective fault current.
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