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Eaton GMD-300-R 300 mA Slow-Blow 5 x 20 mm Glass Fuse
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pEaton GMD-300-R — 300 mA, 250 V, time-delay glass cartridge fuse, 5 x 20 mm, 35 A at 250 Vac; 10,000 A at 125 Vac interrupting./p
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Eaton GMD-300-R 300 mA Slow-Blow 5 x 20 mm Glass Fuse
The GMD-300-R from Eaton carries 300 mA, rated 250 Vac, uses a slow-blow element, in a glass body, measuring 5 x 20 mm.
Technical Data
| Parameter | Rating |
|---|---|
| Part number | GMD-300-R |
| AC interrupting rating | 35 A at 250 Vac; 10,000 A at 125 Vac |
| End caps | nickel-plated brass |
| Body | Glass tube, 5 x 20 mm |
| Voltage rating | 250 Vac |
| Element | single element |
| Typical DC cold resistance | 1.625 Ω |
| Rated current | 300 mA |
| Maximum voltage drop | 800 mV |
| Design standard | UL/CSA 248-14 |
| Typical melting I2t | 0.65 A²s |
Practical Notes
- Interrupting capability is 35 A at 250 Vac; 10,000 A at 125 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.
- 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 300 mA to stop nuisance trips — fix the cause instead.
Application Scenarios
Common installation contexts include:
- EV
Questions and Answers
What are the ratings of the GMD-300-R?
300 mA continuous at 250 Vac, interrupting rating 35 A at 250 Vac; 10,000 A at 125 Vac.
Is the GMD-300-R fast-acting or time-delay?
It is slow-blow. It tolerates short inrush surges.
What size is the GMD-300-R?
It measures 5 x 20 mm. Match the holder or clip to this footprint.
Can the GMD-300-R be used on a higher fault-current circuit?
No — its interrupting rating is 35 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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