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Eaton GMA-3-R 3 A Fast-Blow Cartridge Fuse, Glass, 5 x 20 mm
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pEaton GMA-3-R — 3 A, 250 V, fast-acting glass cartridge fuse, 5 x 20 mm, 100 A at 250 Vac; 10,000 A at 125 Vac interrupting./p
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Eaton GMA-3-R 3 A Fast-Blow Cartridge Fuse, Glass, 5 x 20 mm
The GMA-3-R from Eaton carries 3 A, rated 250 Vac, uses a fast-acting element, in a glass body, measuring 5 x 20 mm.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | GMA-3-R |
| Element | single element |
| End caps | silver-plated brass 63-315 mA, nickel-plated 500 mA-15 A |
| Body | Glass tube, 5 x 20 mm |
| Design standard | UL/CSA 248-14 |
| Typical melting I2t | 8.8 A²s |
| AC interrupting rating | 100 A at 250 Vac; 10,000 A at 125 Vac |
| Maximum voltage drop | 215 mV |
| Voltage rating | 250 Vac |
| Typical DC cold resistance | 0.039 Ω |
| Rated current | 3 A |
Practical Notes
- Interrupting capability is 100 A at 250 Vac; 10,000 A at 125 Vac — 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.
- Footprint 5 x 20 mm — check clip or holder compatibility before substitution.
- Working voltage must stay at or below 250 Vac; a lower-rated part is not a safe substitute.
- Do not upsize beyond 3 A to stop nuisance trips — fix the cause instead.
Application Scenarios
Common installation contexts include:
- EV
Questions and Answers
What are the ratings of the GMA-3-R?
3 A continuous at 250 Vac, interrupting rating 100 A at 250 Vac; 10,000 A at 125 Vac.
Is the GMA-3-R fast-acting or time-delay?
It is fast-acting. Expect it to open quickly on overload.
What size is the GMA-3-R?
It measures 5 x 20 mm. Match the holder or clip to this footprint.
Can the GMA-3-R be used on a higher fault-current circuit?
No — its interrupting rating is 100 A at 250 Vac; 10,000 A at 125 Vac. Choose a part whose breaking capacity exceeds the prospective fault current.
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