KSD301 110°C Normally Closed NC Temperature Switch Thermostat - Bakelite, 250V 10A

The KSD301 is rated for a maximum current of 10 Amps at a voltage of up to 250 Volts, AC or DC. This allows it to directly switch significant loads like heating elements or motors without requiring a relay in many applications.

This unit is a Normally Closed (NC) switch. The contacts are closed at room temperature, allowing current to flow. When the sensing temperature reaches 110°C, the bimetallic disc snaps open, breaking the circuit to provide over-temperature protection.

The switch can be mounted via its metal bracket or directly to a chassis for optimal thermal coupling. Electrically, it is wired in series with the load (e.g., heater) and power source. Ensure good thermal contact with the device being monitored for accurate temperature response.

Yes, it features an automatic reset. Once the local temperature cools below the trip point (typically a few degrees below 110°C), the bimetallic disc will snap back to its original position, closing the contacts and restoring power to the circuit.

Standard bimetallic thermostats like the KSD301 have a typical tolerance of ±3-5°C around the 110°C set point. They are designed for high reliability and can endure tens of thousands of cycles under rated electrical loads, making them suitable for long-term protection.