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CERAMIC PTC THERMISTORS FOR |
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| Heater for Bimetal Thermostat | |||||||||||||||||||
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| In conventional bimetal thermostat, when overcurrent / overheating condition is detected, the two metallic components in the switch (with different thermal expansion coefficient) produces a physical change in shape that effectively opens the switch and turns off the device. A problem develops when the hyper-condition is just sufficient enough to open the switch, but then quickly falls to a level where the bimetal again closes the switch. When this occurs, the device under goes a series of on-off cycles that can be detrimental to its service life and produces a significant compromise to the safety operation. If a PTC thermistor is connected parallel to the bimetal switch, the hyper condition opens the switch and the current is diverted to the thermistor. The thermistor then heats up and reduces the current to a harmless level, thus protecting the device. Meanwhile, heat generated from the thermistor keeps the bimetal switch in an "open" position until the electrical source is turned off. | |||||||||||||||||||
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