KSD301 Series Are Temperature Control Switches That Use Bimetallic Sheets As Temperature Sensing Components. When The Electrical Appliance Is Working Normally, The Bimetallic Sheets Are In A Free State And The Contacts Are In A Closed/Disconnected State. When The Temperature Reaches The Operating Temperature, The Bimetallic Sheets Generate Internal Stress And Quickly Move, Opening/Closing The Contacts, Cutting/Connecting The Circuit, And Thus Playing A Temperature Control Role. When The Electrical Appliance Cools To The Reset Temperature, The Contacts Automatically Close/Open And Return To Normal Working State. It Has The Characteristics Of Stable Performance, High Accuracy, Small Size, Light Weight, High Reliability, Long Service Life, And Low Interference With Radio.