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Eaton S506-400-R 400 mA 250 Vac Time-Delay Glass Tube Fuse
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pEaton S506-400-R — 400 mA, 250 V, time-delay glass cartridge fuse, 35 A at 250 Vac, 50 Hz interrupting./p
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Eaton S506-400-R 400 mA 250 Vac Time-Delay Glass Tube Fuse
Built by Eaton, the S506-400-R carries 400 mA, rated 250 Vac, uses a time-delay element, in a glass body.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Orderable part number | S506-400-R (BK- prefix = 100 pcs carton, BK1- = 1,000 pcs polybag) |
| Typical DC cold resistance | 0.31 Ohm |
| Design standard | IEC 60127-1 and 60127-2 |
| Voltage rating | 250 Vac |
| Typical drop | 210 mV at rated current |
| Time-delay class | T (time-lag) |
| Agency | cURus (E19180, JDYX2); SEMKO; VDE; BSI; IMQ; KC; CCC |
| Rated current | 400 mA |
| Dissipation at rating | 0.08 W |
| Physical form | 5 x 20 mm glass tube, nickel-plated brass end caps |
| Interrupting rating | 35 A at 250 Vac, 50 Hz |
| Typical melting I2t | 0.872 A2s |
Selection Notes
- Interrupting capability is 35 A at 250 Vac, 50 Hz — confirm the circuit's prospective fault current stays below this.
- Time-delay element rides through motor starting and capacitive inrush without nuisance opening.
- Startup surges of several times rated current are tolerated for a short window.
- 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.
Typical Applications
Engineers usually specify it for these duties:
- surge
- transformer
Q&A
What are the ratings of the S506-400-R?
400 mA continuous at 250 Vac, interrupting rating 35 A at 250 Vac, 50 Hz.
Is the S506-400-R fast-acting or time-delay?
It is time-delay. It tolerates short inrush surges.
Can the S506-400-R be used on a higher fault-current circuit?
No — its interrupting rating is 35 A at 250 Vac, 50 Hz. Choose a part whose breaking capacity exceeds the prospective fault current.
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