Ametherm's inrush current limiters are designed to protect your components from damaging levels of inrush current at startup.




Inrush Current Limiters

MegaSurge Rated to 50 Amperes and 900 Joules of input energy. For Motor Drives, Audio Equipment, and Power Supplies

bigAMP Rated up to 36 amperes and 260 joules of input energy. For UPSs, Motor Controls, and Power Supplies with 750 watts or higher output. 
miniAMP Specially designed for value. Available in 3, 5, and 8mm diameters and weigh as little as 0.225 grams 
Standard Large variety of the sizes and electrical specifications of the most common inrush current limiters.



Inrush Current Application Notes


Inrush Energy Calculator



Inrush Energy (J) 
How To select an Inrush Current Limiter 

 Use the maximum allowable surge current and Ohm's Law to determine the least allowable resistance at turn on for your application.
 Using the formula J = .5CV^2, determine how much input energy the thermistor will absorb when the device is turned on.
 Determine the maximum steady state current that will flow through the Inrush Current Limiter.
 Select the Inrush Current Limiter that will work for your application.
Power Thermistor Selection Calculator

