Temperature switches are used in instrumentation to generate a signal when a particular temperature has been reached. The switch closes or opens giving a signal. This signal can be used to stop an equipment in case of high temperature protection or start a compressor in a refrigeration system.
Temperature switches operate in a variety of ways from simple bimetallic strips to thermistor driven electronic switches. In some switches, wax pellets which expand at high temperature can be used.
The output of a temperature switch can be configured to be either normally closed (NC) or normally open (NO).
Temperature Switches need to be periodically calibrated in a Temperature bath to ensure set point accuracy.