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Eaton SR-5F-1.25A-AP 1.25 A 250 Vac Fast-Acting Subminiature Fuse
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pEaton SR-5F-1.25A-AP — 1.25 A, 250 V, fast-acting fuse, 50 A at rated voltage, 50 Hz interrupting./p
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Eaton SR-5F-1.25A-AP 1.25 A 250 Vac Fast-Acting Subminiature Fuse
The SR-5F-1.25A-AP from Eaton carries 1.25 A, uses a fast-acting element.
Technical Data
| Parameter | Rating |
|---|---|
| Parameter | Value |
| Orderable part number | SR-5F-1.25A-AP (-AP = 1,000 pcs ammo pack, 12.7 mm pitch) |
| Current rating | 1.25 A |
| Maximum power dissipation at 1 In | 413 mW |
| Characteristic | Fast-acting (F) |
| Un (rated) | 250 Vac |
| Typical DC cold resistance | 0.116 Ohm |
| Pre-arcing I2t (typical) | 4.4 A2s |
| Interrupting rating | 50 A at rated voltage, 50 Hz |
| Agency | cULus E19180 (JDXY1, JDYX7) / PSE JET5766 |
| Dissipation at rating | 0.41 W |
| Design standard | UL 248-14 |
| Body | Radial leaded, fast-acting, plastic cap and base, UL 94V0 |
| Typical voltage drop | 330 mV at rated current |
Practical Notes
- Interrupting capability is 50 A at rated voltage, 50 Hz — 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.
- Do not upsize beyond 1.25 A to stop nuisance trips — fix the cause instead.
Application Scenarios
Common installation contexts include:
- EV
- adapter
- appliance
- surge
Questions and Answers
Is the SR-5F-1.25A-AP fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
Can the SR-5F-1.25A-AP be used on a higher fault-current circuit?
No — its interrupting rating is 50 A at rated voltage, 50 Hz. Choose a part whose breaking capacity exceeds the prospective fault current.
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