KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch 150C Normally Open - 5A 250V

This KSD9700/BK05-BB1D model is configured as Normally Open (NO). This means the electrical contacts are open (no connection) at room temperature and will close momentarily during heating until the set point of 150°C is reached, at which point they snap open to break the circuit. It is designed to be wired in series with the load for over-temperature cutoff.

The switch is rated for a maximum operating voltage of 250 Volts AC or DC and a continuous current of 5 Amps. Do not exceed these ratings to ensure reliable switching and avoid contact welding or failure. It is suitable for controlling small motors, heating elements, or transformers within these limits.

Installation involves mechanically securing the metallic shell of the switch directly to the surface whose temperature you need to monitor (e.g., a motor housing or heat sink) using thermal adhesive or a mounting clip for optimal thermal transfer. Electrically, connect the two pre-attached lead wires in series with the load (e.g., the heater or motor) and the power source. Ensure all connections are secure and insulated.

This bimetallic snap-action switch is automatically resettable. Once the temperature at the switch drops significantly below the 150°C set point (typically by 10-20°C), the bimetallic disc will snap back, closing the contacts again and restoring the circuit. This cycle can repeat indefinitely, providing continuous protection.