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Inrush Current Limiters - Power Thermistors - Home

AmethermMS22
Power Thermistor Data
Input VoltageInrush Current Limiter
Up To 120vac SL03 - SL08 Series
Up To 240vac SL10 - SL32 Series
Up To 480vac MS15 - MS32 Series
Up To 680vac MS35 Series
Full Line SL03 - MS35
UL & CSA Recognized UL & CSA - SL Series
inrush current graph

Inrush Current Info
Inrush Current Limiters
Power Electronics article on applications of inrush current limiting thermistors - Power Thermistors		 Inrush Current FAQ
Frequently Asked Questions about inrush current limiting thermistors -Power Thermistors		 Inrush Current in Transformers
A sample application of inrush current limiters in transformers.
Inrush Current Causes and Prevention
A summary of what causes inrush current and how it can be addressed.		 How To Select An Inrush Current Limiter
More Detailed explanation of selecting an inrush current limiter -Power Thermistor.		 Thermal Time Constant
What is the thermal time constant of an inrush current limiter.

Select an Inrush Current Limiter - Power Thermistor
Step1)
Use the maximum allowable inrush current and Ohm's Law to determine the least allowable resistance at turn on for your application.

 Step 2)
Determine the maximum steady state current that will flow through the Inrush Current Limiter.
V*1.414/A
Input Voltage
Max Inrush (A)
Lowest Resistance
Needed
Vac/P(out) * 90% efficiency
Output Power
Input Voltage
Steady State
Current
Step 3)
Using the formula
J = ½CV², determine how much input energy the thermistor will absorb when the device is turned on.


 Step 4)
Select a part from this list or any of the links to datasheets and get samples or click on a link to get it from one of our worldwide partners.
Inrush Energy (Joules)
Voltage (peak)
Capacitance in µF
Total Energy
(Joules)
Part R SSI
Max 		Joules
Max 		Max cap
120 vac 		Max cap
240 vac 		Max cap
480 vac 		D Max
(mm) 		T Nom
(mm) 		Digikey Newark Farnell
SL03 10001 10.0 1 2 100 3 3 570-1088-ND 72J6655 9006400
SL10 10002 10.0 2 10 700 135 10 5 72J6710 9006966
SL10 10003 10.0 3 17 1,100 300 10 5 570-1082-ND 72J6711 9006974
SL12 10004 10.0 4 40 2,778 694 13 6 570-1079-ND 72J6732
SL22 10005 10.0 5 90 6,251 1,562 22 5 570-1032-ND 72J6817 9008055
SL18 10005 10.0 5 75 5,209 1,302 19 6 570-1068-ND 72J6808 9007962
SL12 10006 10.0 6 40 2,778 694 13 6 570-1078-ND 72J6734 9007202
SL22 10007 10.0 7 90 6,251 1,562 22 5 570-1033-ND 72J6818 9008063
SL22 10008 10.0 8 90 6,000 1,400 22 6 570-1034-ND 72J6819 9008071
MS22 10008 10.0 8 200 13,850 3,473 802 23 10 570-1003-ND 72J6608 9005935
SL22 10009 10.0 9 100 6,946 1,736 22 5 570-1035-ND 72J6820 9008080
SL32 10015 10.0 15 150 10,419 2,604 31 6 570-1058-ND 72J6844 9008322
MS32 10015 10.0 15 250 19,250 4,341 1,003 31 9 570-1014-ND 72J6620 9006052
MS35 10018 10.0 18 500 34,000 8,683 2,007 37 11 570-1024-ND 72J6630 9006150