Normally Closed (NC) Thermal Switch – 50°C

The device has a heat-sensitive element that detects the ambient temperature and, once the 50°C threshold is exceeded, triggers the contact-opening mechanism. Once the temperature drops below the critical value, the contact closes automatically, allowing the circuit to be restored.

The NC 50°C thermal switch is commonly used in applications where electric motors, electronic equipment, battery power supplies and electrical systems need to be protected from damage caused by high temperatures. It is particularly useful in devices that operate in environments with thermal fluctuations or that could overheat due to malfunctions.

• Fan or cooling system control
  The switch opens the circuit when it reaches 50 °C, automatically activating fans or cooling systems.
• Thermal signalling (LED or buzzer)
  Used to trigger visual or audible signals (e.g. LED or buzzer) that warn when the thermal threshold is exceeded.
• Logic command for microcontrollers
  Can provide an input signal to a microcontroller when the temperature threshold is exceeded.
• Temperature-based load activation
  Fitted in a circuit where you want to activate a component only when the temperature exceeds 50 °C (e.g. resistors, relays, indicators, etc.).

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

• KSD9700 Datasheet