An Electric Switch (ESW) can control a device that has a resistive load no greater than 13A, or an inductive load no greater than 3A (ESW Electric Switch datasheet can be found here, and the wiring diagrams here).
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A contactor is an electrically operated switch. The output from the ESW Electric Switch is fed to the input of the contactor, and the device to be switch (for example an electric radiator) is connected to the output of the contactor.
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The contactor that is used should have a 230VAC coil, as the output of an ESW Electric Switch is 230VAC.
Here is an example of a contactor: https://uk.rs-online.com/web/p/contactors/2155214
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