The RM20D121KD1IECW0 is a Varistor created by the company Dersonic. This product is designed with a 100V to 120 (108-132) voltage rating and a 6.5KA through hole rating. It also features a 10mm Pitch and is RoHS compliant. This device is specifically designed for overvoltage and overcurrent protection in commercial and industrial applications. It is also ideal for eliminating destructive surges. The Varistor is able to do this by clamping and releasing dangerous transients, thereby protecting the connected equipment.