The KNP08SJ0390B00 is a miniature 4-Pin Trimmer Potentiometer made by Royal Ohm. It features a top adjustment type, a total resistance of 390O, a linear taper, a 275VAC voltage rating, and a maximum resistance adjustment of 10%. It is a leaded type with a ceramic body material, 6 terminals, and a ±20% resistance tolerance. The KNP08SJ0390B00 can be used to adjust the level of resistance in circuits to control parameters such as current, voltage, frequency, and power.