What is an Inrush Current Limiter?

An inrush current limiter is a device used to limit the high initial surge of electric current that flows into a circuit when it is turned on or energized. It protects the circuit components by controlling the sudden rush of current, which can potentially damage sensitive components such as capacitors, transformers, and electronic devices.

Inrush current occurs due to the charging of capacitors, the magnetization of inductors, or the initial power-up surge of electronic components. The magnitude of the inrush current can be significantly higher than the steady-state current of the circuit. In some cases, it can cause circuit breakers or fuses to trip.

Inrush current limiters are typically designed using thermistors (NTC or PTC), resistors, or active electronic components. NTC thermistors are commonly used as inrush current limiters. They exhibit a high resistance when cold and gradually decrease their resistance as they heat up due to the passage of current. This characteristic allows them to limit the initial surge of current by effectively controlling the power dissipation.

Inrush Current Limiters from the leading manufacturers are listed on everything PE. You can use the filters on the left side to narrow down the list of products based on your requirements - Current Rating, Voltage Rating, and other parameters. Our parametric search tool will scan multiple manufacturer websites to identify Inrush Current Limiters that meet your requirement. You can then download datasheets and request quotations via everything PE. Your inquiry will be routed to the manufacturer or their representative who will give you more information on the product.