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POLYFUSE ? Resettable PTCs
Radial Leaded > 250R Series
250R Series
Description
The 250R Series is designed to protect against short
duration high voltage fault currents (power cross or power
induction surge) typically found in telecom applications
(250Vrms). The series can be used to help telecom
networking equipment meet the protection requirements
speci?ed in ITU K.20 and K.21.
Features
Agency Approvals
range, 60VDC operating
voltage
resistance ranges available
Free and Halogen-Free*
AGENCY
AGENCY FILE NUMBER
E183209
R50120008
Applications
Equipment (CPE)
telecom centers
Electrical Characteristics
Part Number
I hold
(A)
I trip
(A)
V max
V int / V op
I max
(A)
P d
typ.
(W)
Maximum Time
To Trip
Current Time
(A) (Sec.)
R min
( Ω )
Resistance
R typ
( Ω )
R 1max
( Ω )
Agency
Approvals
250R080
250R080T
250R120
250R120-RA
250R120-RC
250R120-RF
250R120-R1
250R120-R2
250R120-R3
250R120T
250R145
250R145-RA
250R145-RB
250R145T
250R180
250R180T
0.08
0.08
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.12
0.145
0.145
0.145
0.145
0.18
0.18
0.16
0.16
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.24
0.29
0.29
0.29
0.29
0.65
0.65
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
250/60
3
3
3
3
3
3
3
3
3
3
3
3
3
3
10
10
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1.8
1.8
0.35
0.35
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
3
1.5
1.0
0.85
0.7
0.8
0.7
1
1.2
2.5
5
2.5
2.0
21
20
14
15
4
7
5.4
6
6
8
8
7
3
3
4.5
5.4
0.8
1.4
22
22
8
9
7.5
10.5
9
10.5
10
12
6
5.5
6
7.5
2.2
3.9
33
33
16
16
14
16
16
16
16
16
14
12
14
14
4
4.5
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Items with T at end of part number = pre-tripped device. See Part Ordering Number System section of this data sheet for additional information.
I hold = Hold current: maximum current device will pass without tripping in 23°C still air.
I trip = Trip current: minimum current at which the device will trip in 23°C still air.
V int = Maximum voltage the device can withstand without damage at rated current (I max)
V op = The device regular operation voltage
I max = Maximum fault current device can withstand without damage at rated voltage (V max )
R min = Minimum resistance of device in initial (un-soldered) state.
R typ = Typical resistance of device in initial (un-soldered) state.
R 1max = Maximum resistance of device at 20°C measured one hour after tripping.
Caution: Operation beyond the speci?ed rating may result in damage and possible arcing
and ?ame.
P d = Power dissipated from device when in the tripped state at 23°C still air.
* Effective January 1, 2010, all 250R PTC products will be manufactured Halogen Free (HF). Existing Non-Halogen Free 250R PTC products may continue to be sold, until supplies are depleted.
? 2010 Littelfuse, Inc
Speci?cations are subject to change without notice.
Please refer to www.littelfuse.com/series/250R.html for current information.
99
Revised: July 12, 2010
250R Series
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