Generic KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch - 130°C NC, 5A 250V

This switch is configured as Normally Closed (NC). The electrical circuit is completed under normal conditions and will open (break the circuit) once the sensing temperature reaches the calibrated 130°C set point. It resets and closes the circuit again when the temperature drops sufficiently below this threshold.

The switch is rated for a maximum current of 5 Amps at a voltage of up to 250 Volts AC or DC, under resistive load conditions. It is designed to interrupt this current reliably at its temperature set point. For inductive loads (like motors), derating or additional protection (e.g., a snubber circuit) may be required.

For optimal performance, mount the metallic shell of the switch directly onto the component or heat sink you need to monitor, using thermal paste if necessary to ensure good thermal contact. Connect the two lead wires in series with the load or control circuit you wish to protect. Ensure the operating ambient temperature does not exceed the switch's ratings.

Yes, this bimetallic thermal switch features an automatic reset function. Once it trips open at 130°C, it will remain open until the temperature cools down below the reset point (typically several degrees below the set point). The contacts will then automatically re-close, restoring the circuit without manual intervention.