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© 2009 Littelfuse, Inc.

Specifications are subject to change without notice.

Surface Mount Fuses

449 Series

Please refer to www.littelfuse.com/series/449.html for current information.

449 Series Fuse

Description

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.

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.

Agency Approvals

AGENCY

AGENCY FILE NUMBER

AMPERE RANGE

E10480

375mA - 5A

PS

E

NBK030205

1A - 5A

Electrical Characteristics for Series

Features

% of Ampere

Rating

OpeningTime

100%

4 hours, Minimum

200%

1 sec., Min.; 60 sec., Max.

300%

0.2 sec., Min.; 3 sec., Max

800%

0.02 sec., Min.; 0.1 sec., Max.

Electrical Specifications by Item

Ampere

Rating

(A)

Amp Code

Max

Voltage

Rating

(V)

Interrupting

Rating

Nominal Cold

Resistance

(Ohms)

Nominal

Melting

Agency Approvals

0.375

0.375

125

50 amperes @125 VAC/

VDC

PSE: 100 amperes

@100 VAC

1.5130

0.088

x

0.500

0.500

125

0.7633

0.258

x

0.750

0.750

125

0.4080

0.847

x

1.00

001.

125

0.2516

1.76

x

x

1.50

01.5

125

0.1186

4.70

x

x

2.00

002.

125

0.0708

6.76

x

x

2.50

02.5

125

0.0400

13.18

x

x

3.00

003.

125

0.0352

19.55

x

x

3.50

03.5

125

0.0261

32.70

x

x

4.00

004.

125

0.0227

40.80

x

x

5.00

005.

125

0.0171

59.59

x

x

Applications

equipment

protection

Secondary protection for space constrained applications:

Free

®

ratings available

temperature range

de-rating

PS

E

PS

E

Revised: December 17, 2010