Inrush Current Limiters

Input Voltage	Inrush Current Limiter
Power Thermistor Data
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 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.

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.

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