Current protection devices are used to protect circuits from inrush currents and excess currents. TDK offers both NTC inrush current limiters as well as a wide range of PTC thermistors for protection against overload, current surges and excess temperatures. PTC thermistors utilize the fact that their resistance increases rapidly once a certain temperature is reached. This characteristic is used to detect abnormal temperatures or to control inrush currents. NTC thermistors, conversely, are characterized by a high resistance at low temperatures, which decreases with rising temperatures, which makes them suitable for controlling inrush currents immediately after power is activated.