Generic KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch - 45°C Normally Open, 5A 250V

This KSD9700/BK05-BB1D model is configured as Normally Open (NO). The contacts are open at room temperature and will remain open until the surrounding temperature reaches the calibrated set point of 45°C. At that point, the internal bimetallic mechanism snaps to close the contacts. It is designed to complete a circuit upon overheating, often used to trigger an alarm or shutdown sequence, not to directly break a power line. Always verify the intended circuit logic before installation.

The switch is rated for a maximum of 250 Volts AC or DC and a continuous current of 5 Amps. Do not exceed these ratings, as doing so may cause contact welding, failure to switch, or a safety hazard. It is suitable for low to moderate power mains applications, such as controlling small heaters, fans, or alarm circuits.

Mount the metallic body of the switch directly to the surface or component you wish to monitor (e.g., a heatsink, motor housing, or metal enclosure) using thermal adhesive, a bracket, or its mounting holes (if present). Ensure good thermal contact for accurate temperature sensing. Connect the two pre-attached 7cm lead wires into your control circuit. The switch is resettable; it will return to its normal state once the temperature cools below its reset point.

Yes, with important caveats. Its 250V 5A rating allows it to switch mains voltage directly for loads within its specification. However, for safety-critical applications or inductive loads (like motors), it is often recommended to use this switch to control a relay or contactor, which then handles the main power. Always follow local electrical codes and incorporate appropriate fusing.