21
Consult Littelfuse web site for mor
e infor
mation
www
.littelfuse
.com
Electr
onic Over
curr
ent Pr
otection
20
Consult Littelfuse web site for mor
e infor
mation
www
.littelfuse
.com
Or
dering Infor
mation
10 Minute
Catalog
System
Color
Rating
Number
Number
Code
100mA
70P
70P00000Z
Grey/White
150mA
70R
70R00000Z
Red/White
180mA
70E
70E00000Z
Y
ellow
200mA
70X
70X00000Z
Black
250mA
70F
70F00000Z
Violet
250mA
70K
70K00000Z
Violet/White
350mA
70S
70S00000Z
Gray
500mA
70G
70G00000Z
Red
750mA
70H
70H00000Z
Brown
1.33A
70A
70A00000Z
White
2A
70B
70B00000Z
Orange
3A
70C
70C00000Z
Blue
3.5A
70J
70J00000Z
Black/White
5A
70D
70D00000Z
Green/Black
8A
70M
70M00000Z
T
an/White
10A
70N
70N00000Z
Y
ellow/Purple
The 70 Series alarm indicating fuses aredesigned f
or use in telecomm
unications
equipment.
A color
-coded tip pr
o
v
ides
visual identification of the ampere ratingand the fuse status.Featur
es
•
Color coded tip
•
Rated
125 V
A
C
,

300 VDC
SpecificationsAppr
o
v
als:
UL Recogniz
ed
Interrupting Ratings:
1000 amperes @ 125
V
A
C
1000 amperes @ 300
VDC
Electr
onic Over
curr
ent Pr
otection
Alar
m Indicating Fuse
7
0
Series
SpecificationsAppr
o
v
als:
UL Recogniz
ed, CSA Cer
tified
Shor
t Cir
cuit Capabilities
(UL 1459/UL 1950 3r
d ed.)
40 amperes @ 600
V
A
C
7 amperes @ 600
V
A
C
2.2 amperes @ 600
V
A
C
Interrupting Ratings:
50 amperes @ 250
V
A
C
Materials:
Body:
Cer
amic
T
e
r
minators:
Silv
er-plated br
ass caps
Or
dering Infor
mation
Nominal
Nominal
Catalog
Ampere
V
oltage
Resistance
Melting I
2
t
Number
Rating
Rating
(Cold
Ω
)(
A
2
Sec.)
0461
.500
1/2
250
.56
.84
0461
1
.25
1-1/4
250
.1
1
0
1
6.5
4
4
I
2
t is calculated at 1
0
msec or less. I
2
t at 1
0
times rated current has a typical value of 22 A
2
sec (1.25A).
Featur
es
•
Surf
ace mount o
v
ercurrent protection
from lightning and po
w
er cross
•
Meets UL1459/1950 po
w
er cross
requirements stand alone
•
Ideal f
or use in telecomm
unications
equipment including modems
,
f
ax machines
, desktop phones
,
ans
w
e
r
ing machines and line cards
•
Complies with Bellcore GR-1089-COREand FCC 47 P
a
r
t
68 surge specifications
T
elecom Sur
face Mount Fuse
NANO
2
®
46
1 Series
Electrical Specifications
% of Ampere
Opening T
ime
Rating
Minimum / Maximum
100
4 hrs. / —
250
1 sec. /120 sec.
L
F
1.25A
T
3.43
(.135")
3.25
(.128")
3.12
(.123")
3.12
(.123")
10.10
(.397")
6.10
(.240")
12.6
(.496")
Dimensions
Envir
onmental/Lightning Sur
ge Requir
ements
Source
Duration/
Surge
Repetitions
Rating
Standard/
V
oltage
W
ave Form
Current
(Each
for Compliance
T
est
(Vpk)
(µSec.)
(A)
Polarity)
Stand Alone
3
GR-1089 1
st
Level
600
10 x 1000
100
25
1.25A
1000
10 x 360
100
25
1.25A
1000
10 x 1000
100
25
1.25A
2500
2 x 10
500
10
1.25A
1000
10 x 360
25
5
0.5, 1.25A
GR-1089 2
nd
Level
5000
2 x 10
500
1
1.25A
FCC 47 Part 68
800
10 x 560
100
1
1.25A
T
ype A Metallic
FCC 47 Part 68
1500
10 x 160
200
1
1.25A
T
ype A Longitudinal
FCC 47 Part 68
1000
voltage 9 x 720
25
1
0.5, 1.25A
T
ype B Metallic
current 5 x 320
FCC 47 Part 68
1500
voltage 9 x 720
37.5
1
0.5, 1.25A
T
ype B Longitudinal
current 5 x 320
3
Additional series resistance used in conjunction with the fuse may allow compliance by fuse ratings not listed.
Over
voltage/AC Power Fault (Power Cr
oss) Requir
ements:
The most se
v
ere tests are listed,
T
elecom Nano
2
will pass lo
w
er le
v
el test as w
ell.
Source
Surge
Rating
Standard/
V
oltage
Current
for Compliance
T
est
(V
AC)
(A)
Duration
Stand Alone
2
GR-1089
1000
5
0.5 sec.
1.25A
GR-1089
600
60
1
5 sec.
1.25A
UL 1950 3
rd
Edition
600
40
1.5 sec.
0.5, 1.25A
GR-1089
600
7
5
sec.
0.5, 1.25A
UL 1950 3
rd
Edition
GR-1809
100-600
2.2
30 min.
0.5, 1.25A
UL 1950 3
rd
Edition
GR-1809
277
25
15 min.
0.5, 1.25A
UL 1950 3
rd
Edition
120
25
30 min.
0.5, 1.25A
1
The 1.25 rating is designed to enable equipment compliance with GR-1089. Application testing is strongly recommended as actual application and compliance testing will produce random closing angle surge conditions.Actual cir
cuit resistance may enhance equipment per
formance under surge conditions.
2
See UL 1950 for test procedures for fuses and testing at 135%.