Generic KSD301 Ceramic Temperature Controlled Switch Thermostat - 135°C NC, 250V 16A

No, the KSD301 is a non-resettable, one-time-use bimetallic thermostat. Once it trips at 135°C and opens the circuit, it must be replaced. It is designed as a safety cut-off device to prevent overheating and potential fire hazards.

This KSD301 is Normally Closed (NC), meaning its electrical contacts are closed under normal temperatures, allowing current to flow. When the sensed temperature reaches 135°C, the contacts snap open, breaking the circuit. A Normally Open (NO) version would do the opposite, closing the circuit only upon reaching the set temperature.

It is rated for 250V AC resistive loads. Using it with DC may cause arcing and reduced contact life due to the lack of AC zero-crossing. For inductive loads (motors, relays), you should derate the current or use an appropriate snubber circuit, as the inrush and breaking currents can exceed the 16A resistive rating.

For optimal thermal response, mount the ceramic body directly against the surface or component you need to monitor (e.g., a heating element or motor casing). Use a thermal compound to improve heat transfer. Ensure good mechanical contact and secure it with the provided mounting hole, avoiding any insulating gaps.