These Klixon items are a field proven miniature protectors developed to protect electrical equipment against overheating.
   In addition to being small and lightweight, the units are both temperature and current sensitive. Since they are sealed to withstand varnish dipping, they can be mounted directly in windings where they can best sense the true temperature of the electrical equipment. As a result, over-temperature protection is assured.
   SL9 thermostats have 11" leads standard. The SL11 thermostats have 9" leads standard.
 

   Thermostats open or close at a specified temperature in response to hot motor windings to prevent damage to the motor. Thermostats can be installed while the motor is being rewound. Thermostats can also be used in a relay circuit to sound an alarm or activate a time-delay shutdown on special applications.
   A single thermostat is tied on the end turns of each phases winding bundle with lacing cord. Thermostats can also be buried in the windings during rewinding.
   If multiple phase, the thermostats are connected in series between the starter coil and its power supply. When any of the thermostats reaches its operating temperature the circuit is opened, stopping the motor.
   Select the thermostat operating temperature by taking the mid-point between "maximal normal running" ('rise' temperature + 40°C) temperature and "maximum allowed running" (class 'A' insulation: 140°C, class 'B' insulation: 165°C) temperature and subtracting the "gradient"