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

This KSD9700/BK05-BB1D switch is a Normally Closed (NC) type. The electrical contacts are closed at room temperature and will physically snap open to break the circuit when the temperature at the sensor tip reaches its factory-calibrated set point of 35°C. It resets automatically once the temperature cools below the set point.

This switch is rated for a maximum of 5 Amps at 250 Volts, either AC or DC. This means it can directly control loads like heating elements, small motors, or solenoids within those limits without requiring an external relay. Always ensure your application's inrush and steady-state currents do not exceed this 5A rating.

Installation requires mechanically securing the metallic shell to the component or surface you wish to monitor (e.g., a motor housing or heatsink) using thermal adhesive or a clamp for optimal thermal transfer. Electrically, simply connect the two pre-attached 7cm lead wires in series with the load (e.g., the hot wire) of the circuit you need to protect. No external power is needed for the switch itself.

No, the KSD9700/BK05-BB1D model features a fixed, factory-set bimetallic disc calibrated to trip at 35°C. The calibration is not user-adjustable. For a different trip point, you would need to select a different model from the KSD9700 series with the specific temperature rating required for your application.

Typical accuracy for this type of fixed-set bimetallic switch is within ±3-5°C of the stated 35°C set point. Lifespan is dependent on the electrical load and cycling frequency but is generally rated for tens of thousands of mechanical cycles under rated load conditions. The metallic housing provides durability and stable thermal performance over time.