|
Inrush current limiters limit
the large initial current present when a circuit is first
energized. The relatively high initial resistance of the thermistor
acts to limit the inrush current. These parts are used in
switching power supplies to protect components when the power
supply is turned on and the capacitors draw a large amount
of current. Once the the NTC Inrush Current Limiter is heated
to a high temperature, its resistance declines to a very low
level and is effectively removed from the circuit.
TYPICAL
APPLICATION:
- Switching Power
Supplies
- Terminology
NTC
Inrush Current Limiter Products
MEGA
- Amp SERIES
|
Part
Number
|
W@
25 °C
+/-20%
|
Imax
|
R@Imax
(W)
|
Maximum
Diameter (Inches)
|
Lead
Diameter (Inches)
|
|
WS1520
|
0.50
|
36.0
|
0.009
|
1.30
|
0.040
|
|
WS1530
|
0.50
|
30.0
|
0.012
|
1.30
|
0.040
|
|
WS1540
|
1.00
|
36.0
|
0.011
|
1.30
|
0.040
|
|
WS1550
|
1.00
|
30.0
|
0.014
|
1.30
|
0.040
|
|
WS1560
|
2.00
|
23.0
|
0.022
|
1.30
|
0.040
|
|
WS1570
|
2.00
|
25.0
|
0.016
|
1.30
|
0.040
|
|
WS1580
|
5.00
|
20.0
|
0.035
|
1.30
|
0.040
|
|
WS1590
|
10.00
|
15.0
|
0.048
|
1.30
|
0.040
|
| |
|
NTC Inrush Current Limiter Products
MEGA
- Amp SERIES
|
|
Part
Number
|
W@
25 °C
+/-20%
|
Imax
|
R@Imax
(W)
|
Maximum
Diameter (Inches)
|
Lead
Diameter (Inches)
|
|
WS320
|
1.00
|
20.00
|
0.015
|
0.90
|
0.040
|
|
WS330
|
2.00
|
18.00
|
0.030
|
0.90
|
0.040
|
|
WS340
|
2.50
|
3.00
|
0.150
|
0.60
|
0.032
|
|
WS350
|
2.50
|
7.00
|
0.050
|
0.60
|
0.032
|
|
WS360
|
2.50
|
9.00
|
0.040
|
0.60
|
0.032
|
|
WS370
|
2.50
|
10.00
|
0.040
|
0.90
|
0.040
|
|
WS380
|
2.50
|
15.00
|
0.030
|
0.90
|
0.040
|
|
WS390
|
4.00
|
5.00
|
0.150
|
0.50
|
0.032
|
|
WS400
|
4.00
|
8.00
|
0.070
|
0.60
|
0.040
|
|
WS410
|
4.00
|
14.00
|
0.050
|
0.90
|
0.040
|
|
WS420
|
5.00
|
2.00
|
0.400
|
0.60
|
0.032
|
|
WS430
|
5.00
|
4.00
|
0.150
|
0.60
|
0.032
|
|
WS440
|
5.00
|
7.00
|
0.070
|
0.60
|
0.032
|
|
WS450
|
5.00
|
8.00
|
0.050
|
0.70
|
0.040
|
|
WS460
|
5.00
|
9.00
|
0.060
|
0.90
|
0.040
|
|
WS470
|
5.00
|
10.00
|
0.060
|
0.90
|
0.040
|
|
WS480
|
5.00
|
12.00
|
0.060
|
0.90
|
0.040
|
|
WS490
|
7.00
|
3.00
|
0.140
|
0.50
|
0.032
|
|
WS500
|
7.00
|
4.00
|
0.150
|
0.60
|
0.040
|
|
WS510
|
7.00
|
5.00
|
0.150
|
0.60
|
0.040
|
|
WS520
|
7.00
|
6.00
|
0.150
|
0.60
|
0.040
|
|
WS530
|
10.00
|
1.50
|
0.250
|
0.45
|
0.032
|
|
WS540
|
10.00
|
2.00
|
0.200
|
0.45
|
0.032
|
|
WS550
|
10.00
|
3.00
|
0.200
|
0.50
|
0.032
|
|
WS560
|
10.00
|
5.00
|
0.200
|
0.50
|
0.032
|
|
WS570
|
10.00
|
6.00
|
0.150
|
0.60
|
0.040
|
|
WS580
|
12.00
|
4.00
|
0.220
|
0.50
|
0.040
|
|
WS600
|
20.00
|
1.75
|
0.600
|
0.50
|
0.032
|
|
WS610
|
20.00
|
2.50
|
0.500
|
0.50
|
0.032
|
|
WS620
|
25.00
|
1.50
|
0.600
|
0.50
|
0.032
|
|
WS630
|
40.00
|
2.00
|
0.600
|
0.65
|
0.032
|
|
WS650
|
120.00
|
3.00
|
0.900
|
0.95
|
0.040
|
|
|
