Surface Mount Fuses
NANO2® > Slo-Blo® > 449 Series
PS
E
449 Series Fuse
Description
The lead free NANO2 Slo-Blo® fuse is RoHS compliant,
Halogen Free and 100% lead-free. This product is fully
compatible with lead-free solder alloys and higher
temperature profiles associated with lead-free assembly.
The Slo-Blo® design has enhanced inrush withstand
characteristics over the NANO2 Fast-Acting Fuse. The unique
time delay feature of this fuse design helps solve the
problem of nuisance “opening” by accommodating inrush
currents that normally cause a fast-acting fuse to open.
Features
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Agency Approvals
Free
temperature range
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AGENCY
AGENCY FILE NUMBER
E10480
AMPERE RANGE
375mA - 5A
de-rating
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ratings available
PS
E
NBK030205
1A - 5A
Applications
Secondary protection for space constrained applications:
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Electrical Characteristics for Series
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% of Ampere
OpeningTime
4 hours, Minimum
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Rating
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100%
equipment
200%
300%
800%
1 sec., Min.; 60 sec., Max.
0.2 sec., Min.; 3 sec., Max
0.02 sec., Min.; 0.1 sec., Max.
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protection
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Electrical Specifications by Item
Max
Agency Approvals
Ampere
Rating
(A)
Nominal Cold
Resistance
(Ohms)
Nominal
Melting
Voltage
Interrupting
Rating
Amp Code
PS
E
Rating
(V)
I2t (A2sec)
0.375
0.500
0.750
1.00
.375
.500
.750
001.
01.5
125
125
125
125
125
125
125
125
125
125
125
1.5130
0.7633
0.4080
0.2516
0.1186
0.0708
0.0400
0.0352
0.0261
0.0227
0.0171
0.088
0.258
0.847
1.76
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
50 amperes @125 VAC/
VDC
1.50
4.70
2.00
2.50
3.00
3.50
4.00
5.00
002.
02.5
003.
03.5
004.
005.
6.76
PSE: 100 amperes
@100 VAC
13.18
19.55
32.70
40.80
59.59
Notes: - l2t calculated at 8ms. Resistance is measured at 10% of rated current, 25ºC
© 2012 Littelfuse, Inc.
449 Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/449.html for current information.
Revised: June 3, 2012