Special Application Fuses
481 Series Alarm Indicating Fuse
481 Series Alarm Indicating Fuse
Description
RoHS
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
• Color-coded indicator
flags indicate ampere
rating.
• Clear plastic lens option
available for additional
safety.
• RoHS compliant
Opening Time
10 Minutes, Minimum
5 Minutes, Maximum
E71611
29862
0.180A - 20A
0.180A - 20A
• Body is constructed of
black plolyphenylene
sulfide with UL 94 V-0
flammability rating.
• Contacts made of bright
alloy-plated beryillium
copper.
Electrical Characteristics
% of Ampere
Rating
100%
150%
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
White/Black
White/Red
Yellow/Green
Blue/Red
White/Green
Nominal
Cold Resistance
(Ohms)
6.25
5.70
4.20
2.00
1.52
1.25
.980
.665
.480
.385
.120
0.093
.0670
.0415
.0350
.0285
.0113
.00840
.00660
.00580
.00394
Nominal Melting
I
2
t (A
2
Sec.)
0.0400
0.0576
0.0625
0.230
0.490
0.723
1.32
1.82
3.13
2.55
10.2
16.0
25.0
10.5
36.0
64.0
121.0
380.3
571.2
900.0
1024.0
Agency
Approvals
40A @ 175 VDC
450A @ 60 VDC
125 VAC
&
125 VDC
300A @ 125 VAC
(up to 20A)
300A @ 125 VDC
(up to 15A)
200A @ 125 VDC
(up to 20A)
460A @ 60 VDC
(up to 15A)
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
* 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.
Specifications are subject to change without notice. Application testing is strongly recommended.
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/14/18
Special Application Fuses
481 Series Alarm Indicating Fuse
Product Characteristics
Body: Polyphenylene Sulfide (UL 94VO)
Material
Terminations: Beryllium Copper/Tin Plated
Optional Lens: Nylon
Vibration
MIL-STD-202 Method 201
Operating Temperature
Thermal Shock
Insulation Resistance
(After Opening)
– 55
O
C to 125
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
5A
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")
5.8
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 M P
RoHS ITEM OPTION CODE:
Blank = Standard design item
P = RoHS compliant version item
(available in 2-20 Amp Range only)
AMPERAGE STAMPING MARK:
Blank = Standard design item
M = Front Side
ACCESSORY:
Blank = Standard design item
X = Filler
XL = Protective Lens
QUANTITY CODE:
V = 5 pack
H = 100 pack
AMP COLOR CODE:
(See Electrical Characteristics Table)
FUSE SERIES
Additional Information
1481001
Datasheet
Resources
Samples
Disclaimer Notice
-
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each
product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at:
www.littelfuse.com/disclaimer-electronics.
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 06/14/18
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