The micro-processed controller ST502-KPTA.12 is used for the thermostatic temperature control of simple refrigerating plants. It is supplied with 230V AC and has four exit relays.
The relays can be used for different functions, e.g. for a compressor, a fan, a defroster, an alarm relay, etc. The two resistance sensors seize the refrigerating chamber temperature and the evaporator temperature.
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