Generic KSD302 Ceramic Temperature Controlled Switch Thermostat - Normally Closed NC, 100°C, 250V 10A

The KSD302 is a Normally Closed (NC) switch. At room temperature, the electrical contacts are closed, allowing current to flow. When the temperature at the sensor reaches the calibrated setpoint of 100°C, the internal bimetallic disc snaps and mechanically opens the contacts, breaking the circuit to stop current flow. It automatically resets and closes the contacts once the temperature drops sufficiently below the setpoint.

This thermal switch is rated for 250 Volts AC and a maximum current of 10 Amps. This rating is typically for resistive loads. For inductive loads like motors or transformers, derating may be necessary to account for inrush currents and arcing. Always ensure your application's voltage and current requirements are within these limits for safe and reliable operation.

For accurate temperature sensing, the ceramic body of the thermostat must be in good thermal contact with the heat source or the environment you wish to monitor. Mount it securely using the provided mounting holes or an appropriate bracket. Ensure the electrical connections are tight and properly insulated, as the device operates at mains voltage (250V). Avoid subjecting the ceramic body to mechanical stress or shock during installation.

No. The KSD302 is specifically rated for 250V AC operation. Using it with DC voltages, especially at high currents, can cause excessive arcing and damage the contacts due to the lack of AC zero-crossing. Furthermore, this is a fixed-setpoint thermostat calibrated to trip at 100°C. The temperature setting is not user-adjustable. For different trip temperatures or DC applications, a different model must be selected.