Thermostats are used as temperature controllers and, therefore, for the control of Filterfans® or electrical enclosure heaters. They are available with N.C. (normally closed) / N.O. (normally open) and changeover contacts.
Twin thermostats are switching units in various temperature ranges, they use less space than 2 single devices which saves energy and reduce costs.
In combination with control cabinet heaters you can ensure, besides temperature control, that the control cabinet is ‘artificially’ dehumidified, in particular in outdoor applications. That means that the temperature is kept above the dew point so that no water condenses out of the air, which could lead to short circuits due to the formation of condensation.