Inrush Current Solutions

Inrush Current Limiters are used to reduce the inrush current that occurs when an electrical device is switched on. High inrush current is the result of the maximum instantaneous input current drawn by an electrical device during the initial power up. As technology continues to advance, most systems today run efficiently and maintain a low impedance which in turn contributes to high inrush current.

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Inrush Current Limiters


The AS Series of Inrush Current Limiters are used in high energy applications and short term high current.


Surge-Gard Inrush Current Limiters Formerly of RTI Electronics.

Standard Inrush Current Limiters

Standard Inrush Current Limiters come in a wide array of sizes, values, and ratings.


The Big AMP series of Inrush Current Limiters are used in high energy applications and short term high current.

MS35 Inrush Current Limiter

The MS35 is our most rugged Inrush Current Limiter for up to 680 volts.

PTC Inrush Current Limiters

PTC Thermistor for Inrush Current Protection.  Rated for up to 680 Volts.


These Inrush Current Limiters are UL and CSA approved.

Mini Amp Miniature Inrush Current Limiters where cool operation is desired

The Mini-AMP Inrush Current Limiter is great for compact power applications.

Mega Surge Inrush Current Limiters

The Mega Surge Inrush Current Limiters are best used when you have higher than average voltage and current requirements.

Inrush Current Limiter Data Sheets

Additionally, devices that produce alternating current such as electric motors or transformers can draw several times their steady state current at switch on.

Although this additional draw of inrush often lasts less than ½ of a normal 60 hertz cycle, that is enough time to cause possible damage to the equipment.


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limiting heat lamp inrush current

Limiting Heat Lamp Inrush Current Protects Relay Contacts

Limiting Heat Lamp Inrush Current Incandescent heat lamps create a large inrush current when first powered on. Limiting heat lamp inrush current prevents relay damage and extends lamp life. Heat lamps can be used to warm enclosed areas such as livestock pens and chicken coops. Banks of incandescent heat lamps are mounted overhead. As the number of heat lamps increases, limiting heat lamp inrush current becomes more important. Over current can damage relay contacts in … Continue Reading

Protect your RV AC motor with Inrush Current Limiters

Limit AC Motor Inrush Current

Limit Inrush Current In AC Motor Air Conditioning Application AC motors used in air conditioning equipment draw large inrush current at power-on. A recent customer of ours had a 115-VAC air conditioner installed in their travel trailer for park use. This 5,000-BTU unit required 16 amps for simultaneous compressor and blower motor operation. The trailer was also equipped with a load-shedding power distribution panel to protect its wiring harness from overload. If more … Continue Reading

Equations to Calculate Inrush Current

Calculate Inrush Current in Three Steps

Why do I need to Use Inrush Current Calculators to Select an Inrush Current Limiter? An Inrush Current Limiter (ICL) can protect electrical equipment from overheating at switch-on due to inrush current. And, because inrush current equals the maximum instantaneous surge of incoming current from a power source, it can equate to as much as 2-3 times the steady state current of the attached device. So, Inrush Current Calculators are the … Continue Reading



Resource Center

Inrush current limiting solutions, tips and tricks.

Inrush Current Limiters

Inrush Current APP Notes

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