| 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:
Terminology
Imax - Maximum steady state current (DC or AC).
R @ Imax - Approximate resistance at maximum steady state current.
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
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
|
| | | | | | |
| 
