This electronic part is a KSD.301-100/103PAK thermal protection switch manufactured by Xucheng. It is a through-hole, RoHS-compliant component that features a temperature range of -20 to 175°C and accurate temperature control. It is typically used as a thermal cut-off device, with a bimetallic strip that is certified for accurate temperature control and a breaking point that is adjustable between -10 step and 175°C, depending on the needs of the user. It features high insulation resistance, low contact resistance, and highly reliable operation. The KSD.301-100/103PAK is suitable for many industrial applications, including home appliances, automotive, power supplies, air conditioners, and temperature measurement and control systems.