More than 40 years ago, before the company STEGO came into existence, control cabinets were heated with a lit lightbulb that was, so to speak, in continuous operation. Those were the times before enclosure heaters were available.When the industry finally started using special heaters for enclosures and cabinets, STEGO, too, took part in the business with its first enclosure heaters called “Heiz-Igel” (meaning “heating hedgehog”, from the look of the heater). These heaters were not regulated, thus ran in continuous operation, as there were no enclosure thermostats at that time either. This has proven to be a significant disadvantage, as there is no upper-temperature limit in a cabinet if the heater runs non-stop: permanently high temperatures limit the service life of other devices installed in the cabinet. Some enclosure manufacturers started using household or room thermostats at some point, due to the lack of adequate equipment. However, these were able to measure and control temperatures of up to 25°C only. This was the time when the idea of an enclosure thermostat by our Mr Eisenhauer came into play. The first controller was a so-called “change-over” contact and was located in a metal housing...
Read the full article in the July issue of PBSI
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