The 561KH10 is a varistor manufactured by Yageo, an electronics supplier. This varistor is a through-hole component and is compliant with the Restriction of Hazardous Substances Directive (RoHS) of the European Union. The 561KH10 is an unidirectional device used to protect electronics from transient voltage spikes. It has a voltage range of 18-33V, a rated power of 150mW, and a dissipation factor of 0.1W. It has a response time of up to 30nsec and features an insulation system of UL 94V-1. Additionally, the 561KH10 has a storage temperature range of -55 to 85°C and an operating temperature range of -40 to 85°C.