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Eaton S506-4-R 4 A 250 Vac Time-Delay Glass Tube Fuse
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pEaton S506-4-R — 4 A, 250 V, time-delay glass cartridge fuse, 40 A at 250 Vac, 50 Hz interrupting./p
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Eaton S506-4-R 4 A 250 Vac Time-Delay Glass Tube Fuse
The S506-4-R from Eaton carries 4 A, rated 250 Vac, uses a time-delay element, in a glass body.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Orderable part number | S506-4-R (BK- prefix = 100 pcs carton, BK1- = 1,000 pcs polybag) |
| Typical melting I2t | 71.8 A2s |
| Dissipation at rating | 0.27 W |
| Time-delay class | T (time-lag) |
| Agency | cURus (E19180, JDYX2); SEMKO; VDE; BSI; IMQ; PSE (JET); KC; CCC |
| Current rating | 4 A |
| Rated voltage | 250 Vac |
| Interrupting rating | 40 A at 250 Vac, 50 Hz |
| Typical voltage drop | 67 mV at rated current |
| Body | 5 x 20 mm glass tube, nickel-plated brass end caps |
| Typical DC cold resistance | 0.0139 Ohm |
| Design standard | IEC 60127-1 and 60127-2 |
Practical Notes
- Interrupting capability is 40 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 4 A to stop nuisance trips — fix the cause instead.
Application Scenarios
Common installation contexts include:
- UPS
- EV
- surge
Questions and Answers
What are the ratings of the S506-4-R?
4 A continuous at 250 Vac, interrupting rating 40 A at 250 Vac, 50 Hz.
Is the S506-4-R fast-acting or time-delay?
It is time-delay. It tolerates short inrush surges.
Can the S506-4-R be used on a higher fault-current circuit?
No — its interrupting rating is 40 A at 250 Vac, 50 Hz. Choose a part whose breaking capacity exceeds the prospective fault current.
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