
Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
2
© 2010 Littelfuse, Inc.
Specications are subject to change without notice.
Axial Lead and Cartridge Fuses
5x20mm > Time-Lag > 977 Series
977 Series
Please refer to www.littelfuse.com/series/977.html for current information.
Average Time Current CurvesTemperature Rerating Curve
0.001
0.01
0.1
1
10
100
1000
10000
0.01 0.1 1
977.500
10 100 1000
9773.15
977.800
977002
977008
97706.3
977005
977004
977010
977012
977016
Current in Amperes
Time in Seconds
Amp Code Amp Rating
Voltage Rating
Interrupting
Rating
Nominal Cold
Resistance
(milli-ohms)
Nominal
Melting
I
2
t (A
2
sec.)
Agency Approvals
AC
DC
.500 0.5 500 450
"!7BD
"!7ED
0.3 x
500 450 x
002. 2 500 450 44.5 xx
500 450 xx
004. 4 500 450 xx
005. 5 500 450 xx
500 450 xx
500 450 233 x x
500 450 x
500 450 x
500 450 x
Electrical Characteristic
PS
E
I
2
UUFTUBUYSBUFEDVSSFOU
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