KSD301 Ceramic Normally Closed NC Temperature Control Switch Thermostat - 80°C, 250V 16A

A Normally Closed (NC) thermostat has contacts that are closed, allowing current to flow, at temperatures below its setpoint. When the sensed temperature reaches 80°C, the internal bimetallic disc snaps and opens the contacts, breaking the circuit. This design is standard for over-temperature protection, where an open circuit signals a fault condition.

The KSD301 is primarily designed as a safety cut-off for heating applications. Its NC configuration opens on a temperature rise, which is ideal for shutting off a heater. To control a cooling device (like a fan), you would typically need a Normally Open (NO) thermostat or use this NC switch in conjunction with a relay to invert the logic, as it turns the connected load OFF when hot.

This is an automatic reset thermostat. Once the local temperature cools down sufficiently below the 80°C setpoint (typically by a few degrees due to hysteresis), the bimetallic disc will snap back to its original position, closing the contacts again and automatically restoring power to the circuit. No manual intervention is required.

Yes, the 250V 16A rating is typically applicable for both AC and DC resistive loads. However, for inductive loads (motors, solenoids) or high inrush currents, derating is recommended. Always consult the specific datasheet for the switch and consider the load type to ensure reliable switching and contact longevity.