The RL0603E005M500K is a varistor (voltage-dependent resistor) manufactured by the company Ruilongyuan. This varistor is in 0603 size and is RoHS compliant. With a 5V-25V range, this varistor provides surge and transient protection and can be used in a variety of electronic devices. This is an ideal choice for circuits with high voltage spikes and overvoltage conditions. It can be used to protect against surges, waves, electrostatic discharge, and more.