KSD301 Temperature Controlled Switch Thermostat (85°C Normally Closed, 10A 250V)

The 'Normally Closed' configuration means the electrical contacts inside the switch are closed, allowing current to flow, when the temperature is below its 85°C setpoint. When the sensed temperature rises to or above 85°C, the bimetallic disc snaps and physically opens the contacts, breaking the circuit to stop power to the load. It automatically resets and closes the contacts once the temperature cools sufficiently below the trip point.

Yes, the KSD301 is rated for 250V AC and 10A, which exceeds common 120V AC requirements, making it suitable for direct switching. You can wire it in series with the hot line (Line) of your 120V AC heating element. Ensure the total current draw of your heater does not exceed the 10A rating. Its NC operation makes it ideal for safety cutoff, where power should be on during normal operation and off during an over-temperature fault.

Installation requires good thermal contact between the thermostat's metal casing and the surface or medium you wish to monitor. The device typically has a mounting hole or is designed for surface mounting. Secure it firmly to a clean, flat area on the component (like a heater tank or motor housing) using a clamp, adhesive, or its integrated flange. Ensure the sensing surface is in direct contact for accurate temperature response. Wire the two terminals in series with the load you wish to control.

No, the KSD301 model featured here is a fixed-setpoint thermostat. The 85°C trip temperature is factory-calibrated and cannot be adjusted by the user. The bimetallic disc is precisely manufactured to snap at this specific temperature. If you require a different setpoint, you would need to select a different KSD301 variant with the corresponding fixed temperature rating (e.g., 60°C, 70°C, 100°C).