3

www.littelfuse.com/fuseholders

©2010 Littelfuse, Inc.

Specifications are subject to change without notice.

Series

Name1

Device Range 3

(Operating

Current

Options in

Amps)

Max. Voltage

Rating 3

(Volts)

Interrupting

Rating at

Max Voltage

Rating 3

(Amps)

Operating

Temperature

Range

Agency Approvals 3

Americas

Europe

Asia

312/318

0.01 - 35

250 / 125 / 32

35 - 300

-55°C to +125°C

313/315

0.01 - 30

250 / 125 / 32

35 - 300

314/324

0.125 - 40

250

35 - 1000

322

1 - 30

250 / 65

100 - 1000

325/326

0.01 - 30

250 / 125

100 - 600

388

1 - 30

250

100

505

10 - 30

450 / 500

20,000 - 50,000

Panel Mount Holders

PC Board Mount Holders

Blocks

Clips

In- Line Holders

34453 International Shock-Safe

345101 horizontal

354 Omni-Blok

102071

155100 Twist-Lock

345 International shock-Safe (old) 810 horizontal

356 Screw terminal

102074

150215 Assem,no Fuse

342 Traditional

862 horizontal

359 Screw terminal

122083

155000 Heavy Duty

344 Indicating Snap Mount

811 vertical

FB66A

122067 Berylium Copper

150079 Assem,no Fuse

348 Snap Mount

122088

150322 120VAC UL,

346377 Flip Top

122093 Berylium Copper

342006 Watertight screw-in

102078

340312/3 Shielded Watertight

102079

342024 Mll high temp knurled

102076

342025 Mll high temp fluted

102076

800 2.5 Watt

102080

80001 500V 2.5 Watt

122090 Berylium Copper

860 4 Watt

121001 Berylium Copper

FH602R

100058

FH604R

101001

101002

101003

102064

121004 Berylium Copper

121002 Berylium Copper

518 Combo,3AA & 5X20

6.3mm x 32mm (3AB / 3AG) SIZE FUSE SERIES AND HOLDER OPTIONS

FUSE HOLDER RE-RATING:

For 25°C ambient temperatures, it is recommended that fuse holders be operated at no more

than 60% of the nominal current rating established using the controlled test conditions specified

by Underwriters Laboratories.

The primary objective of these UL test conditions is to specify common test standards

necessary for the continued control of manufactured items intended for protection against fire,

etc. A copper dummy fuse is inserted in the fuse holder by Underwriters Laboratories, and then

the current is increased until a certain temperature rise occurs.

The majority of the heat is produced by the contact resistance of the fuse holder clips. This value

of current is considered to be the rated current of the fuse holder, expressed as 100% of rating.

Some of the more common, everyday applications may differ from these UL test conditions as

follows: fully enclosed fuse holders, high contact resistance, air movement, transient spikes, and

changes in connecting cable size (diameter and length).

Even small variations from the controlled test conditions can greatly affect the ratings of the fuse

holder. For this reason, it is recommended that fuse holders be de-rated by 40% (operated

at no more than 60% of the nominal current rating established using the Underwriter

Laboratories test conditions).