鈥?/div>
Main Distribution Frame (MDF)
Central Office Switching (C.O.)
Subscriber Terminal Equipment (T.E.)
Set-top box (S.B.).
DESCRIPTION
Advanced developments in telephony equipment in recent
years have radically altered the protection requirements for
both exchange and subscriber equipment. The Vishay
BCcomponents range of Positive Temperature Coefficient
(PTC) thermistors includes devices specially designed to
provide overcurrent protection.
MARKING
Clear marking on a grey coated body.
BC and R25 value.
ELECTRICAL DATA AND ORDERING INFORMATION
V
MAX.
(V)
NON-TRIP
CURRENT
I
nt
(mA)
at T
(
擄
C)
RESISTANCE
MATCHED
PAIRS
R
25
(
鈩?/div>
)
TOL
(%)
TRIP
CURRENT
I
t
(mA)
at T
(
擄
C)
MAX.
TRIP TIME
at 25
擄
C
t
t
(s)
at I
t
(mA)
APPLICATION
AREA
(1)
CATALOG
NUMBER
2322 ... .....
661 93048
661 93147
661 93025
661 93037
661 93175
661 93142
662 93081
662 93074
661 93118
661 93148
663 93025
661 93078
661 93121
661 93124
661 93146
661 93135
661 93056
661 93139
662 93129
662 93114
(2)
662 93131
(2)
COMPATIBILITY
鹵
20
1
鈩?/div>
200
25
2.5
1000
C.O.
K20/21
220
70
70
25
230
100
70
10
鹵
20
1
鈩?/div>
250
25
3
1000
MDF; ISDN
K20/21
245
60
70
70 +10/
鈭?/div>
15
no
180
25
60
220
C.O.
鈭?/div>
245
75
70
33
鹵
20
鹵
5%
150
10
1.2
1000
C.O.
鈭?/div>
245
70
70
25
鹵
15
no
200
25
20
400
C.O.
K20/21; FTCSE I31-24
245
65
85
25
鹵
20
2%
200
25
3.40
650
C.O.
K20/21
鹵
20
no
270
25
8
1000
T.E.
K20/21; FTCSE I31-21
245
140
55
16
245
140
55
10
鹵
20
no
270
25
8
1000
T.E.
K20/21; FTCSE I31-21
250
100
40
20 +10/
鈭?/div>
20
1
鈩?/div>
220
25
1
1 000
MDF
鈭?/div>
250
70
70
25
鹵
20
1
鈩?/div>
175
25
1.3
1 000
MDF; C.O.
K20/21
鹵
20
no
450
0
0.30 8 000
T.E.
K20/21
250
100
70
10
285
135
95
8
鹵
25
0.5
鈩?/div>
400
25
6
1000
MDF; ISDN
K20/21
300
100
70
16
鹵
25
no
250
25
2.0
1000
MDF; T.E.
K20/21
350
100
70
10
鹵
20
no
270
25
4.0
1000
T.E.; S.B.
K20/21
鹵
20
1
鈩?/div>
270
25
4.0
1000
C.O.
K20/21
350
100
70
10
600
50
70
50
鹵
20
1
鈩?/div>
140
25
1
1000
C.O.
K20/21
600
70
70
35
鹵
20
3
鈩?/div>
600
0
3
1000
C.O.
K20/21
600
70
70
25
鹵
20
2%
170
25
4
700
C.O.
K20/21
600
70
70
25
鹵
20
2%
170
25
8
700
C.O.
K20/21
600
175
25
10
鹵
20
0.5
鈩?/div>
400
25
7
1000
C.O.
UL1459/GR1089
鹵
20
no
400
25
7
1000
T.E.; S.B.
UL1459/GR1089
600
175
25
10
Notes
1. MDF: Main Distribution Frame; C.O.: Central Office Switching; T.E.: Subscriber Terminal Equipment; S.B.: Set-top Box.
2. UL 1434 approved types.
Document Number: 29070
Revision: 10-Oct-03
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
163
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