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BLADE TERMINAL AND SPECIAL PURPOSE FUSES
LOW VOLTAGE
ATO®Fuse Fast-Acting Type
Designed and originated by Littelfuse for the automotive
industry, the ATO
®
fuse has become the original equipment
circuit protection standard for foreign and domestic
automobiles and trucks. Readily identifiable and easily
replaced, this fuse can be specified for a variety of low
voltage electronic applications.
ELECTRICAL CHARACTERISTICS:
% of Ampere Ampere Opening
Rating Rating Time
110% 1–40 Amp 100 Hours Minimum
135%
1–2 Amp .50 sec., Min.; 600 sec., Max.
3– 40 Amp .75 sec., Min.; 600 sec., Max.
200%
1–2 Amp .10 sec., Min.; 5 sec., Max.
3– 40 Amp .15 sec., Min.; 5 sec., Max.
350%
1–2 Amp .020 sec., Min.; 0.5 sec., Max.
3– 40 Amp .080 sec., Min.; 0.5 sec., Max.
AGENCY APPROVALS: Listed by Underwriters
Laboratories (1–40 amperes). Cer tified by CSA
(3–30 amperes).
DESIGN STANDARDS:U.L.Standard for Automotive Blade
Type Fuses. SAE (Society of Automotive Engineers) J1284.
PATENTED
COLOR-CODING: Autofuse
®
fuses are color-coded for easy
amperage identification.
ORDERING INFORMATION:
Average Time Current Curves
Ampere Voltage Body Nominal Cold Minimum
Catalog Rating Rating Color Resistance Melting I2t
Number (A) (VDC) Code Ohms (A2Sec.)
257 001 1 32 Black 0.123 .4
257 002 2 32 Grey 0.050 1.4
257 003 3 32 Violet 0.031 7.4
257 004 4 32 Pink 0.023 14
257 005 5 32 Tan 0.018 26
257 07.5 71/
2
32 Brown 0.011 60
257 010 10 32 Red 0.0077 115
257 015 15 32 Blue 0.0048 340
257 020 20 32 Yellow 0.0033 520
257 025 25 32 Natural 0.0025 1080
257 030 30 32 Green 0.0019 1510
257 035 35 32 Blue Green 0.0016 2280
257 040 40 32 Orange 0.0014 3310
Reference pg.106, ATO®Fuse Clip for P.C.Board mounting.
®
U
L
®
Reference Dimensions
.75"
.48"
.25"
.16"
.57"
3A4A5A
7 1/2A
10A
1000
100
10
15A
20A
25A
30A
35A
.20"
.026"
40A
1
TIME IN SECONDS
0.1
0.01
CURRENT IN AMPERES
1000100101
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