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

This specific KSD9700/BK05-BB1D model is configured as Normally Open (NO). This means the electrical contacts are open at ambient temperatures below its 150°C setpoint. They close only if the switch is manually reset after a trip (if it's a resettable type) or remain permanently open after a single trip (if it's a one-shot thermal fuse). Always verify the specific variant's reset behavior for your application.

This switch is rated for 5 Amperes at 250 Volts Alternating Current (AC). It is designed to directly interrupt this load when it trips at its 150°C temperature setpoint. Do not exceed these ratings, and ensure the inrush current of your load (like a motor or heating element) is within the switch's specifications to avoid contact welding.

Mount the switch securely with its metallic shell in direct thermal contact with the component or area you need to protect (e.g., a motor housing or heatsink). Wire it in series with the load (heater, fan) on the live (hot) side of your AC line. When the local temperature reaches 150°C, the internal bimetallic disc will snap, opening the circuit and cutting power to the load to prevent overheating.

The product name 'Temperature Control Switch' typically implies a resettable device. Most KSD9700 series switches are automatic or manual reset types that close again after cooling down. However, some variants may be one-shot. For critical safety applications, you must confirm the exact reset behavior (automatic, manual, or non-resettable) from the supplier's datasheet for your specific batch or part number suffix.