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This is a variable type of the 2 amp. standard model MQT8
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Variable type of the 5 amp. Model
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Variable type of the 5 amp of the M2
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Principle of operation
For this thermostat, a resistor is built in the thermostat as a heat generator, and it is structured in such way that the electric current is changed by the external variable resistor, as if applying a bias to the operating temperature of the thermostat to achieve the objective. In other words, if the variable resistor is adjusted in a way to allow a high current, the thermostat operates before reaching the preset temperature, and if the variable resistor is adjusted in a way not to allow a current, the thermostat will operate at the preset temperature.
As a result, the range between the preset temperature and the operating temperature, by the variable resistor allowing maximum current, is the temperature variable range.
The temperature of the generated heat by the built in resistor determines the variable range. Because of such a design, this thermostat is provided with a lead wire for control, in addition to the standard lead wire, resulting a total of three wires.
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