ICHThe 14D391K is a Varistor with a voltage range of 320V - 650V and a current rating of 4.5KA. It is through hole in design and is RoHS-compliant. It is manufactured by COVICH, a company that specializes in electronic components. The 14D391K is used to protect against transient voltage surges and can be used a variety of industrial, commercial, and military applications.