Generic KSD301 130°C Normally Closed NC Temperature Control Switch Thermostat - Bakelite, 250V 10A

This is a Normally Closed (NC) switch. At room temperature, the contacts are closed, allowing current to flow. When the sensing surface reaches its calibrated 130°C set point, the internal bimetallic disc snaps and physically opens the contacts, breaking the circuit to stop the connected heater or load.

Yes, but it requires careful wiring logic. As a Normally Closed (NC) device, it opens on temperature rise. To activate a cooling fan, you would typically wire the fan through a relay coil, using the thermostat's NC contacts in the relay's control circuit, so that the fan turns ON when the thermostat opens at the high-temperature set point.

The switch is rated for 10 Amperes at up to 250 Volts AC or DC, for resistive loads (like heating elements). For inductive loads (motors, solenoids), derating is recommended, or use an external relay to handle the inrush current and arcing, thereby prolonging the thermostat's contact life.

Mount the thermostat with its metal sensing surface in firm, direct contact with the heat source or surface you wish to monitor. Use the provided mounting holes and non-conductive hardware. Ensure the Bakelite body is not under mechanical stress. Wire the two terminals in series with the load (e.g., heater) and power source.