How does the overheat protection function work?
Electric heaters are a efficient way to keep your home warm during the colder months. However, they come with a risk of overheating and potential fire hazards. To mitigate this risk, many modern electric heaters are equipped with overheating protection mechanisms. First and foremost, it’s important to understand that electric heaters work by converting electrical energy into heat. When electricity flows through the heating element of the heater, it produces heat. The heating element is usually made of metal, such as nickel-chromium or iron-chromium alloys. The heat produced by the heating element is then transferred to the surrounding air by convection or radiation.
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Thermal switches – Most electric heaters use one of two types of overheating protection mechanisms: thermal switches or temperature sensors. Thermal switches are usually found in older electric heaters and are simpler in design.
Model Number: PH-1903
Input Power: 750W/1500W
input voltage: 220-240V
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Thermal switches consist of a bimetallic strip that bends and breaks an electrical contact when it reaches a certain temperature. This interrupts the flow of electricity to the heating element, effectively shutting off the heater. Once the temperature drops to a safe level, the bimetallic strip cools down and the contact is re-established, allowing the heater to turn back on.
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Temperature sensors – On the other hand, temperature sensors are more commonly found in modern electric heaters. They use a thermistor, which is a resistor that changes its resistance in response to changes in temperature.
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The thermistor is connected to a control circuit that monitors its resistance and triggers the shutdown mechanism when the temperature exceeds a certain threshold. The control circuit can be programmed to turn off the heater temporarily or permanently, depending on the severity of the overheating.
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