Normally Closed (NC) thermal switch – 80°C

The device has a sensitive thermal element that reads the ambient temperature and, once the 80°C threshold is passed, trips the contact-opening mechanism. As soon as the temperature falls below the critical value, the contact closes again automatically, restoring the circuit.

The NC 80°C thermal switch is commonly used where electric motors, electronic equipment, battery power supplies and electrical systems need protection from damage caused by high temperatures. It is particularly useful in devices working in environments with temperature swings, or that could overheat because of a fault.

• Fan or cooling system control
  The switch opens the circuit when 80 °C is reached, automatically starting fans or cooling systems.
• Thermal signalling (LED or buzzer)
  Used to trigger visual or audible signals (e.g. LED or buzzer) warning that the thermal threshold has been passed.
• Logic input for microcontrollers
  It can provide an input signal to a microcontroller when the temperature threshold is passed.
• Temperature-driven load switching
  Fitted in a circuit where a component should switch on only once the temperature goes above 80 °C (e.g. heating elements, relays, indicators, etc.).

• Sensor material:
  Bimetal: the sensor is made of two metals with different thermal expansion coefficients; when the trip temperature is reached, the bending of the bimetallic strip opens or closes the electrical contact.
• Reset: automatic (when the temperature drops below the threshold value)

• Datasheet KSD9700