KSD201 70 Thermostat Thermal Fuse Control Switch With for GE Microwave, Oven, Water Dispenser, Coffee Maker, Water heater, And Other Appliances. Normally Closed: KSD201 The original state of thermostat thermal fuse control switch contact is closed, to break off when the temperature sensing exceeds the rated temperature 70℃ (158℉). KSD201 Working Principle: When the temperature sensing exceeds the rated temperature of 70℃ (158℉), the thermostat thermal fuse will automatically cut off the circuit to prevent damage to the machine due to overheating When the electrical appliance works normally, the bimetallic sheet is in the free state and the contact is in the closed / open state. When the temperature reaches the operating temperature, the contact is opened / closed, and the circuit is cut / closed, so as to control the temperature. When the electric appliance cools to the reset temperature, the contact will automatically close / open and to the normal working state. Please note: It is recommended to disconnect electrical appliances from all public facilities before installing KSD201 thermal fuses. If you are unsure how to choose or replace, it is best to consult professional maintenance personnel. KSD201 Before purchasing: please pay attention to the shape of the contact terminal and ensure that it matches the original shape. This is very important for ensuring compatibility. Determine whether your machine requires a normally open (NO) or normally closed (NC) switch.