Blade Terminal & Special Purpose Fuses
450
www.littelfuse.com
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). Certified 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.
INTERRUPTING RATING:
1000A @ 32VDC
ORDERING INFORMATION:
Average Time Current Curves
Ampere Voltage Body Nominal Cold Minimum
Catalog Rating Rating Color Resistance Melting I
2
t
Number (A) (VDC) Code Ohms (A
2
Sec.)
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 7
1
/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. 344, ATO
®
Fuse Clip for P.C. Board mounting.
5.08
(.20")
0.66
(.026")
19.05
(.75")
14.48
(.57")
12.19
(.48")
6.35
(.25")
4.064
(.16")
Reference Dimensions
®
U
L ®
1000
100
10
1
0.1
0.01
1000100101
TIME IN SECONDS
CURRENT IN AMPERES
1A 2A 3A 4A 10A 15A 20A 25A 30A 35A 40A7.5A5A
RoHS