How does the KST thermostat regulate temperature in a steam iron?

The KST thermostat regulates temperature in a steam iron using a bimetallic disc that responds to heat changes. Here's how it works:

1. Heating Up

When the iron is powered on, the heating element begins to generate heat.

The bimetallic disc inside the KST thermostat absorbs heat and gradually expands.

2. Temperature Control (Cut-Off Mechanism)

Once the preset temperature is reached (e.g., 150°C - 200°C, depending on the setting), the bimetallic disc bends due to thermal expansion.

This bending action triggers a mechanical switch that disconnects the circuit, cutting off power to the heating element.

3. Cooling & Reconnection

As the heating element cools down, the bimetallic disc contracts and returns to its original shape.

This reconnects the electrical circuit, allowing the heating element to turn back on.

4. Continuous Temperature Regulation

This on-off cycling continues, ensuring that the iron maintains a stable temperature without overheating.

The thermostat prevents excessive heat buildup, improving safety and energy efficiency.

Additional Features in Steam Irons

Adjustable Temperature Dial: Users can control the thermostat's setpoint for different fabrics (cotton, silk, wool, etc.).

Thermal Fuse Backup: Some steam irons have an extra safety fuse that cuts power if the thermostat fails.

Moisture & Steam Resistance: The thermostat is designed to withstand high humidity levels inside the iron.