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

This is a manual-reset, snap-action bimetallic switch. Once it trips open at 150°C, the circuit remains open until the switch body cools down significantly below the setpoint, at which point the contacts will automatically re-close. It does not require a physical button press to reset.

Yes, the switch is rated for 250V and 5A for both AC and DC resistive loads. Ensure your application's voltage and current do not exceed these ratings. For inductive loads (like motors), derating may be necessary to prevent contact arcing.

Install the switch in direct thermal contact with the device or area you wish to monitor, using its metallic shell for optimal heat transfer. Connect its two lead wires in series with the load (e.g., heater, motor) you want to protect. The switch is Normally Closed (NC), so the circuit is complete under normal temperatures and opens upon overheating.

Standard bimetallic thermal switches like the KSD9700 series typically have an actuation tolerance of ±5°C to ±10°C. Therefore, the actual trip temperature can range from approximately 140°C to 160°C. For precise control, consider a calibrated electronic thermostat.