The Bourns MOV-20DxxxK Series of metal oxide varistors provides robust protection against voltage surges in various applications. These devices feature a 20mm radial leaded design, offering high current handling capabilities and fast response times to mitigate transient faults. They are suitable for power supplies, high-current power systems, telecom systems, and white goods/appliances. The MOV-20D821K specifically offers a varistor voltage tolerance of +/-10% and is RoHS compliant, ensuring environmental responsibility and reliable performance.