KSD 9700 series product is a thermostat with bimetal as temperature sensing element. When the electrical appliance works normally, bimetal is in free state, and the contact is in closed / open state. When the temperature rises to the action temperature value, the bimetal element will generate internal stress when heated and act quickly, open / close the contact, cut / close the circuit, so as to play a role of thermal protection. When the temperature drops to the nominal value, the contact will automatically close / open and return to the normal working state. It is widely used in the automatic protection of household appliances, motors and electrical equipment, such as washing machine motors, air conditioning fan motors, transformers, ballasts, electric heating appliances, etc.
N.O. / N.C. difference:
Normally closed: the original state contact of the temperature control switch is closed. When the temperature sensing temperature exceeds the rated temperature, the contact is disconnected
Normally closed = de energized over temperature.
Normally open: the original state contact of the temperature control switch is open. When the temperature sensing temperature exceeds the rated temperature, the contact is closed.
Normally open = over temperature on.
The reset temperature indicates that when the action temperature is below 75 ℃, the reset temperature is 20 ± 15 ℃ lower than the action temperature. When the operating temperature is 75-100 ℃, the reset temperature is 30 ± 15 ℃. When the operating temperature is above 100 ℃, the reset temperature is 40 ± 15 ℃. As it is a mechanical switch, according to the industry regulations, every 5 degrees is a gear.