Generic KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch - 35°C NC, 5A 250V

The switch uses a bimetallic disc mechanism housed in a metallic shell. At its calibrated setpoint of 35°C, the differential expansion of the two metals causes the disc to snap, physically opening the normally closed (NC) contacts to break the circuit. It resets automatically when the temperature drops sufficiently.

Wire the two pre-attached leads in series with the load (e.g., a motor or heating element) you wish to protect. Under normal temperatures (below 35°C), the circuit is complete. If the switch's sensing area reaches 35°C, it opens, interrupting power to the load to prevent overheating.

The switch is rated for a continuous current of 5 Amperes at a maximum voltage of 250 Volts, either AC or DC. Do not exceed these ratings to ensure reliable operation and avoid contact welding or failure.

No, the setpoint is fixed at 35°C at the factory and is not user-adjustable. Typical bimetallic switches like this have a manufacturing tolerance on the actuation temperature, usually in the range of ±3°C to ±5°C. For precise control, a calibrated electronic thermostat is recommended.

Mount the metallic sensing tip (2.0 x 0.8 x 0.2 mm head) in direct thermal contact with the component or surface you need to monitor, using thermal paste or a clamp for better heat transfer. Ensure good airflow is not cooling the switch independently of the target, which would cause inaccurate triggering.