KSD301 10A 250V Thermostat Sensor (65C Normally Open)

The 'Normally Open (NO)' configuration means the electrical contacts are open (no connection) at room temperature and close to complete the circuit when installed. When the sensing surface reaches the calibrated 65°C trip point, the internal bimetallic disc snaps, forcing the contacts to open again, breaking the circuit to stop the connected device and provide over-temperature protection.

Yes, the KSD301 is rated for 10A at 250V AC, allowing it to directly interrupt the power to a heater or motor of that capacity. It is designed as a primary safety cut-off switch, not just a signal. Ensure your wiring and terminals are rated for the same current to handle the load safely.

Mount the sensor's metal face firmly against the surface you need to monitor (e.g., a motor housing or heater block) using the provided mounting hole or a clamp to ensure good thermal contact. Connect the two spade terminals in series with the AC live wire of the device you want to protect. The switch will automatically reset once the temperature cools below its trip point.

While it may function at lower DC voltages, the KSD301 is specifically rated for 250V AC operation. Using it on DC circuits, especially at its full current rating, is not recommended as the arc suppression characteristics differ, which could reduce contact life or cause failure. For DC applications, select a switch rated for DC interruption.