Inrush Current Limiter Calculator

When designing a circuit that uses an inrush current limiter, one of the most important parameters is the energy rating of the circuit. Once the energy rating of the circuit has been determined, a suitable inrush current limiter can be selected. This calculator helps to determine this energy rating.

Enter voltage and capacitance below in order to calculate energy. This will be populated automatically.

 Voltage (peak VAC or VDC): V Capacitance: µF Energy (Joules): J

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The below table lists some of the inrush current limiter series available through us by Ametherm, along with their specifications:
Ametherm SL Series
Series Maximum Steady State Current Resistance at +25°C Maximum Capacitance at 120VAC Maximum Recommended Energy
SL03 1A to 2A 10Ω to 220Ω 100μF 2J
SL05 0.25A to 3A 4Ω to 120Ω 200μF to 340μF 3J to 12J
SL08 1.1A to 3A 4Ω to 120Ω 550μF to 697μF 8J to 12J
SL10 1A to 5A 10Ω to 30Ω 700μF to 2000μF 2J to 120J
SL12 1A to 10A 1Ω to 220Ω 1389μF to 2778μF 10J to 60J
SL15 2A to 10A 1Ω to 220Ω 2778μF to 4167μF 35J to 55J
SL18 3A to 12A 0.7Ω to 47Ω 4500μF to 8335μF 65J to 120J
SL22 1A to 16A 0.5Ω to 220Ω 3473μF to 10000μF 2J to 160J
SL32 15A to 36A 0.25Ω to 10Ω 6946μF to 20839μF 100J to 300J
Ametherm MS Series
Series Maximum Steady State Current Resistance at +25°C Maximum Capacitance at 120VAC Maximum Recommended Energy
MS12 2A to 2A 150Ω to 150Ω 7500μF to 7500μF 110J to 110J
MS15 4.2A to 4.2A 30Ω to 40Ω 9300μF to 9300μF 135J to 135J
MS22 2A to 8A 0.5Ω to 220Ω 5100μF to 16400μF 75J to 240J
MS32 6A to 40A 0.5Ω to 50Ω 13500μF to 20700μF 250J to 300J
MS35 10A to 50A 0.5Ω to 20Ω 34000μF to 62000μF 500J to 800J
Ametherm AS Series
Series Maximum Steady State Current Resistance at +25°C Maximum Capacitance at 120VAC Maximum Recommended Energy
AS32 6A to 36A 0.5Ω to 50Ω 17500µF to 20700µF 250J to 300J
AS35 10A to 50A 0.5Ω to 20Ω 500J to 800J