Littelfuse 250S Series User Manual
Poly-fuse, Resettable ptcs, 250s series
57
Revised: July 29, 2012
POLY-FUSE
®
Resettable PTCs
© 2012 Littelfuse, Inc
250S S
eries
Surface Mount > 250S Series
250S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/250S.html for current information.
The 250S High Voltage Radial device is a Polymer-based
PTC suitable to protect telephony equipment against
lightining and power cross strikes. The 250S Series is
fully compatible with telecommunications standards, and
is offered in horizontal and new vertical surface mount
package.
Agency Approvals
AGENCY
AGENCY FILE NUMBER
E183209
Electrical Characteristics
Part Number
Device
Mounting
Layout
I
hold
(A)
I
trip
(A)
V
max
(V
int
/V
op
)
I
max
(A)
P
d
typ.
(W)
Time to Trip at 1A
Resistance
Agency
Approvals
Typical
(Sec.)
Maximum
(Sec.)
R
min
(Ω)
R
max
(Ω)
R
1max
(Ω)
250S130
Horizontal
0.13
0.26
250/60
3
1.2
0.9
4.0
4
13
20
–
250S130–RA
0.13
0.26
250/60
3
1.2
1.4
4.0
6.5
10
15
–
250S130–RB
0.13
0.26
250/60
3
1.2
0.7
4.0
9
13
20
–
250S130–RC
0.13
0.26
250/60
3
1.2
1.1
4.0
7
11
17
–
250S130V
Vertical
0.13
0.26
250/60
3
1.2
2.0
4.0
4
13
20
–
I
hold
= Hold current: maximum current device will pass without tripping in 20°C still air.
I
trip
= Trip current: minimum current at which the device will trip in 20°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
)
P
d
= Power dissipated from device when in the tripped state at 20°C still air.
R
min
= Minimum resistance of device in initial (un-soldered) state.
R
max
= Maximum 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 specified rating may result in damage and possible arcing
and flame.
Description
Features
Applications
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