KSD301 70°C Normally Closed (NC) Thermal Control Switch – 10A 250V Bimetal Snap-Action Thermostat for Overheat Protection

The KSD301 70°C is a compact, high-performance bimetal thermostat designed to provide critical thermal protection for a wide range of electronic and electrical applications. This "Normally Closed" (NC) variant acts as a safety watchdog: the internal contacts remain connected during normal operation but "snap" open instantly once the surface temperature of the device reaches 70°C. This instant response interrupts the electrical flow, effectively preventing overheating and protecting your equipment from potential damage. Engineered for longevity and consistency, the KSD301 is built with a rugged metal flange that allows for secure surface mounting. Its low-profile design and standard spade terminals make it an easy drop-in replacement for failed switches or a reliable addition to new DIY projects. Whether you are building a custom battery charging station or repairing industrial heating elements, the KSD301 ensures your system operates within safe thermal limits. Because of its high current rating and voltage tolerance, this thermal switch is found in everything from household kitchen appliances to sophisticated medical equipment. The combination of its mechanical simplicity and high-precision temperature sensing makes it one of the most trusted and cost-effective thermal management components in the electronics industry. Ensure the safety of your designs with this professional-grade bimetal protector.

Key Features:

High Electrical Capacity: Rated for up to 10A at 250V AC, making it suitable for high-power household appliances and industrial electronic systems.

Automatic Reset Function: Once the temperature drops approximately 10–15°C below the set point, the switch automatically resets and restores the circuit connection.

Superior Thermal Conductivity: Features a high-quality aluminum cap that provides excellent contact for fast heat transfer and sensitive temperature detection.

Durable Construction: Housed in a heat-resistant ceramic or high-grade bakelite body (depending on variant) with standard 6.3mm quick-connect terminals for easy wiring.

Essential Safety Component: Widely used as a thermal cut-off in coffee makers, microwave ovens, water heaters, and power supply units to prevent component failure.