POWER SWITCHING DEVICE, POWER SWITCHING SYSTEM, POWER SWITCHING MODULE AND METHOD FOR PROTECTING A POWER SWITCHING DEVICE

Abstract

A power switching device for monitoring the temperature of a relay configured to interrupt the power supply to a load and to assess whether or not the power supply should be interrupted, the power switching device comprising: the relay;a temperature calculation unit configured to calculate a temperature of the drive coil based on a relational expression between a resistance value of the resistor and a temperature, a reference temperature sensing unit configured to measure a reference temperature, a reference resistance value sensing unit configured to calculate a reference resistance value, and an evaluation unit configured to evaluate, based on the temperature of the drive coil calculated by the temperature calculation unit, whether or not to interrupt the power supply, wherein the temperature calculation unit calculates the temperature of the drive coil based on the relational expression calibrated on the basis of the reference temperature and the reference resistance value.