Revised: March 11, 2009

Introduction to Circuit Protection

Introduction to Circuit Protection

Transientology

© 2009 Littelfuse, Inc.

Specifications are subject to change without notice.

Axial Lead & Cartridge Fuses

491 Series

EC3051v1E-0902-CUST

Please refer to www.littelfuse.com for current information.

Average Time Current Curves

Temperature Rerating Curve

Soldering Parameters

1000

100

10

1

0.1

0.01

1000

100

10

1

0.1

CURRENT IN AMPERES

Wave Parameter

Lead-Free Recommendation

Preheat:

100

150

Preheat Time:

60-180 seconds

Solder PotTemperature:

260

°

Solder DwellTime:

2-5 seconds

Recommended Hand-Solder Parameters:

Note: These devices are not recommended for IR or

Convection Reflow process.

Recommended Process Parameters:

Note:

continuous operation.