Datasheet

Revised: January 7, 2009
133
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Radial Lead Fuses
272/273/274/278/279 Series
Please refer to www.littelfuse.com/series/272.html, /273.html, /274.html,
/278.html or /279.html for current information.
MICRO™ > Very Fast-Acting > 272/273/274/278/279 Series
272-4/278-9
Product Characteristics
Operating Temperature:
273 and 279: –55ºC to +85ºC;
272 and 278: –55ºC to +125ºC
Fuses to MIL SPEC
273 Series is available in CSA LR
29862. Military QPL type (FM02).
To order, change 273 to 274.
Materials
272 and 278 series cap:
Nickel Plated Brass
273, 274 and 279 series cap:
Mirror polished Polycarbonate
Base: R-4 Ryton
Pins: Tin Plated Copper
Product Marking
Current and voltage ratings stamped
on cap
Dimensions
7.30
(.29")
(.17")
8.89
(.35")
2.54 (.10")
7.30
(.29")
25.4 (1.0")
2.54 (.10")
25.4 (1.0")
2.54 (.10")
5.97
(.235")
6.35
(.25")
5.97
(.235")
2.54 (.10")
8.89
(.35")
6.35
(.25")
272 000 Series
273 000 and 274 000 Series
278 000 Series
279 000 Series
(Short Lead, Metal Cap)
(Short Lead, Clear Plastic Cap)
(Long Lead, Metal Cap)
(Long Lead, Clear Plastic Cap)
NOTE: Amperage and voltage rating stamped on cap.
Leads are tin plated copper; .025" diameter.
(.17")
4.32
4.32
Part Numbering System
0273 xxxx V
Packaging Code
Amp. Code
Series
Refer to Amp Code column of
Electrical Characteristics Table
V = 5
H = 100
Packaging
Packaging Option Packaging Specification Quantity
Quantity &
Packaging Code
Bulk N / A 5 V
Bulk N / A 100 H