|i. Break type
|When the surrounding temperature is lower than the
return temperature, the Thermorite acts as magnetic material, thus
creating a single loop of magnetic field as though one big magnet
surrounds the reed switch. Due to this magnetic field, reed switch
contacts are inducted to positive and negative poles, therefore being
attached by magnetism and turning the switch "ON".
When the surrounding temperature becomes higher than the operating
temperature, the Thermorite changes into nonmagnetic material, letting
each permanent magnet creating independent magnetic fields. As a result,
flux near the reed contact decreases. This makes the contact becoming
apart due to the elasticity of reed, turning the switch "OFF".