KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch (75°C NO, 5A 250V)

This is a normally-open (NO) bimetallic switch. It remains open at temperatures below 75°C and closes the circuit when cooled. When the sensing temperature reaches 75°C, the internal bimetallic disc snaps to physically open the contacts, breaking the circuit. It will automatically reset and close the contacts once the temperature cools sufficiently below the setpoint.

The switch is rated for 5 Amps at up to 250 Volts AC or DC, for resistive loads. This rating is suitable for directly switching small motors, heating elements, or solenoids. For inductive loads like motors, derating or using an external relay is recommended for long-term reliability. Always ensure your operating current does not exceed the 5A specification.

Install the switch in series with the load you wish to protect, ensuring good thermal contact between its metallic shell and the heat source you are monitoring. The two wire leads are not polarized. Secure the switch's body directly to the component (e.g., motor housing, transformer core) using thermal adhesive or a mounting clip for optimal temperature sensing response.

No, the KSD9700/BK05-BB1D model has a fixed, factory-calibrated setpoint of 75°C. The bimetallic mechanism is sealed within the metallic housing and is not user-adjustable. If a different trip temperature is required, you must select a different model from the KSD9700 series with the corresponding pre-set temperature rating.