
2
Technical Data 4326
Effective December 2015
6125FF
Fast-acting subminiature fuses
www.eaton.com/elx
Electrical characteristics
% of Amp Rating Opening Time
100% 4 Hours Minimum
200% 5 Second Maximum
Product specifications
Part Number3Current rating
(amps)
Voltage rating Interrupting rating1 (amps) DC cold
resistance
(mΩ) Typ.
Melting2
I2t
(A2 second)
Typical
voltage
drop (mV)Vac Vdc 125Vac 72Vdc 32Vdc
6125FF500-R 500mA 125 72 50 50 300 750 0.08 605
6125FF750-R 750mA 125 72 50 50 300 350 0.152 433
6125FF1-R 1 125 72 50 50 300 260 0.22 415
6125FF1.25-R 1.25 125 72 50 50 300 171 0.355 410
6125FF1.5-R 1.5 125 72 50 50 300 112 0.456 365
6125FF2-R 2 125 72 50 50 300 49 1.67 160
6125FF2.5-R 2.5 125 72 50 50 300 45 5.20 155
6125FF3-R 3 125 72 50 50 300 35 6.24 153
6125FF3.5-R 3.5 125 72 50 50 300 27 7.28 150
6125FF4-R 4 125 72 50 50 300 26 7.4 145
6125FF5-R 5 125 72 50 50 300 17 9.5 141
6125FF6.3-R 6.3 125 72 50 50 300 14 15.1 135
6125FF7-R 7 125 72 50 50 300 11 37.25 112
6125FF8-R 8 125 72 50 50 300 8.7 70 110
6125FF10-R 10 125 72 50 50 300 7.3 67.75 110
6125FF12-R 12 125 72 50 50 300 5.3 210.59 106
6125FF15-R 15 125 72 50 50 300 4.2 296.10 104
1 AC Interrupting Rating (Measured at designated voltage, 100% power factor); DC Interrupting Rating (Measured at designated voltage, time constant of less than 50 microseconds, battery source)
2 Typical Melting I2t (Measured at 72Vdc, 10X rated current (not exceed 50A - IR @ 72Vdc)
3 Part number definition: 6125FFxxx-R
6125FF= Product code and size
xxx= Ampere
-R= RoHS compliant
Recommended pad layout–mm (in)
1.35
(0.053) TYP.
2.72±0.15
(0.107±0.006)
6.10±0.20
(0.24±0.008)
2.72±0.15
Dimensions–mm (in)
(0.102)
4.0
(0.157)
(0.118)
8.6
(0.338)