Datasheet

Blade Fuses
FK3 MAXI® STYLE BLADE FUSE RATED 80V
Specifications
Insulating Body:
Cover:
Terminals:
Interrupting Rating:
Complies with:
cULus Recognized:
Out of thermoplastic (UL 94-V0, heat-resistant)
Out of thermoplastic (UL 94-V0, heat-resistant)
Red, not transparent
Blade contacts
Copper alloy, gal. Sn
Edge-protected
1000 A @80 VDC
UL 248 Special Purpose Fuses
File No. E10480
Ordering Information
Part Number
Description
The FK3-80 is a MAXI ® style fuse rated at 80V, featuring three
piece design with copper contacts for excellent reliability in harsh
environment conditions and low voltage drop. Current ratings 20A
thru 50A. Filled with arc-quenching material.
Pre-Arcing Time-Limits
Package Size
166.6885.5xx2
1000
166.6885.5xx1
10
Time-Current Characteristics
% of Rating
Opening Time Min / Max (s)
100
360,000 s / –
135
– / 1,800 s
200
2 s / 60 s
350
0.20 s / 7 s
600
0.040 s / 1 s
Dimensions
Dimensions in mm
FI = 1.43 (max. operating
current : 0.7 x Irat at 23°C)
Ratings
Part Number
Current Rating
166.6885.520_
166.6885.530_
Housing Color
Typ. Voltage Drop
Cold Resistance
I2t
20 A
120 mV
4.50 mΩ
2,160 A²s
30 A
160 mV
3.00 mΩ
4,950 A²s
166.6885.540_
40 A
110 mV
1.65 mΩ
12,800 A²s
166.6885.550_
50 A
100 mV
1.20 mΩ
25,500 A²s
Corresponding holder see Section “Fuse Holders.”
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© 2012 Littelfuse • Transportation Products Catalog
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