NTC Inrush Current Limiters


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 
  • 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 

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


 




Copyright 2008 WECC | All Rights Reserved   Home | Company Overview | Product Info | Contact Us

Factory Direct
Technical Sales - sales@wecc.com Design/Engineering - mrazeggi@wecc.com General Inquiries - info@wecc.com
Western Electronic Components © 2008
521-A Spectrum Circle Oxnard, CA 93030  (805) 988-9888