KSD9700/BK05-BB1D Metallic Shell Temperature Control Switch - 70C NO, 5A 250V

This switch has a Normally Open (NO) contact configuration. At room temperature (below 70°C), the contacts are open, and the circuit is broken. When the temperature at the switch's metallic shell reaches its calibrated set point of 70°C, the internal bimetallic disc snaps, closing the contacts to complete the circuit (or, in some NO configurations, it may open further; clarification: for a protective cutoff, the NO contacts typically remain open at temperature, breaking a normally closed path). It acts as a temperature-activated switch or cutoff.

The switch is rated for a maximum of 5 Amperes at up to 250 Volts, either AC or DC. This means it can directly interrupt the power to loads up to 1250W (at 250V AC) or corresponding DC power. It is suitable for controlling small motors, heating elements, or transformers directly without an additional relay. Do not exceed these ratings to avoid contact welding or switch failure.

For accurate temperature response, the metallic shell of the switch must be in good thermal contact with the component or area you wish to monitor. Mount it using the provided bracket holes or secure it with thermal adhesive. Wire the switch in series with the load you want to protect using the 7cm pre-attached leads. Ensure the connections are secure and insulated. The switch requires no external power; it is a passive, thermally-actuated device.