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.” www.littelfuse.com © 2012 Littelfuse • Transportation Products Catalog