STEGO KTO 011 is electromechanical thermostat designed for controlling electrical heating. The thermostat has one NC (normally closed) contact that normally conducts, but opens when temperature exceed the set temperature.
The temperature control range is 32-140F. The electrical NC contact is rated for AC120V 16(2)A and AC250V 10(2)A. Let’s open the device.
The temperature controlling us done with this contruction that consista of bimetallic strip, electrical switch mechanism and temperature control knob.
The switch mechanism seems to use same type of quick activication spring mechanism that some microswitches use. It provides sharp quick operation and some hysteresis. The mechanism has marking TKP-1 16A 250V AC 0-60 NC.