Special Application Fuses
481 Series Alarm Indicating Fuse
481 Series Alarm Indicating Fuse
Description
481 Series alarm indicating fuses are designed to reduce
down time by immediately pinpointing the blown (open)
circuit while triggering an LED or audio alarm. This item
requires 482 Series mating fuse holder.
All ranges of 481 Series fuses are available as our original
design, and the 2-20 amp range is now available as a RoHS
compliant option (use the “P” designator when ordering).
See the part numbering section of this data sheet for related
ordering instructions.
Agency Approvals
Agency
Agency File Number
Features
flags indicate ampere
rating.
option available for
additional safety.
black plolyphenylene
sulfide with UL-94V0
flammability rating.
bright alloy-plated
beryillioum copper.
E71611
LR 29862
Electrical Characteristics
% of Ampere
Rating
100%
150%
Opening Time
10 Minutes, Minimum
5 Minutes, Maximum
Applications
Ideal for telecommunications and control panel circuits
Electrical Characteristics
Ampere
Rating
(A)
0.180*
0.200*
0.250*
0.375*
0.500*
0.650*
0.750*
1.00*
1.33*
1.50*
2.00
2.50
3.00
3.50
4.00
5.00
7
.50
10.0
12.0
15.0
20.0**
Amp
Code
.180
.200
.250
.375
.500
.650
.750
001.
1.33
01.5
002.
02.5
003.
03.5
004.
005.
07
.5
010.
012.
015.
020.
Max
Voltage
Rating
(V)
Interrupting
Rating
Body
Color
Code
Yellow
Red/Black
Violet
Gray/White
Red
Black
Brown
Gray
White
Yellow/White
Orange
Orange/White
Blue
Blue/White
Brown/White
Green
Black/White
Red/White
Green/Yellow
Red/Blue
Green/White
Nominal
Cold Resistance
(Ohms)
6.25
5.70
4.20
2.00
1.52
1.25
.980
.665
.480
.385
.120
.0904
.0670
.0415
.0350
.0285
.0113
.00840
.00660
.00580
.00394
Nominal Melting
I
2
t (A
2
Sec.)
0.00808
0.0140
0.0356
0.028
0.139
0.278
0.363
0.733
1.58
2.55
5.29
9.46
11.2
10.5
15.4
26.2
42.8
115.3
222.5
294.22
570.0
Agency
Approvals
450A @ 60 VDC
300A @ 125 VAC
(up to 20A)
300A @ 125 VDC
(up to 15A)
200A @ 125 VDC
(up to 20A)
* 0.180A thru 1.5A items are not available for sale as a RoHS compliant “P” option
**20A Fuseholder must be used. Fuse is keyed to prevent insertion in lower rated holders.
20A Fuseholder is designed to accept all ratings up to 20 amperes.
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/481.html for current information.
345
Revised: January 7, 2009
Alarm Indicating Fuse 481 Series
481 Series
125 VAC
&
125 VDC
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Introduction to Application Fuses
Special Circuit Protection
Transientology
481 Series Alarm Indicating Fuse
Product Characteristics
Body: Polyphenylene Sulfide (UL 94VO)
Material
Terminations: Beryllium Copper/Tin Plated
Optional Lens: Nylon
Vibration
Per MIL-STD-202F
Insulation Resistance
(After Opening)
Operating Temperature
Thermal Shock
– 55
O
C to 90
O
C.
Withstands 5 cycles of – 55
O
C to
125
O
C
Greater than 10,000 ohms.
Dimensions
22.9
mm
(.90") MIN.
17.8
mm
(.70")
Average Time Current Curves
18/100 A
1/4 A
1/2 A
65/100 A
3/4 A
1A
1 1/3 A
2A
3A
4A
5
A
7 1/2 A
10 A
12 A
15 A
20 A
1
10
100
CURRENT IN AMPERES
LENS
19.6
mm
(.77")
21.3
mm
(0.84")
REF.
1000
11.7
mm
(.46")
TIME IN SECONDS
100
16.9
mm
(.665") MAX.
(.109")
8
mm
.23")
5.3
mm
(.21")
2.77
(.175")
4.45
(.110")
2.79
10
1-15A
20A*
*20A Fuseholder must be used. Fuse is keyed
to prevent insertion in lower rated holders.
20A Fuseholder is designed to accept all
ratings up to 20 amperes.
1
0.1
Part Numbering System
0.01
0.1
1000
0481 .180 H XL P
RoHS ITEM OPTION CODE:
Blank = Standard design item
P = RoHS compliant version item
(available in 2-20 amp range only)
OPTION CODE:
Blank = Standard
XL = Protective Lens
QUANTITY CODE:
V =
5
pack
H = 100 pack
AMP CODE
(See Electrical Characteristics Table)
SERIES
Alarm Indicating Fuse 481 Series
346
Revised: January 7, 2009
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/481.html for current information.
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