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The Relay Switch can be used to switch electronic devices on and off, either at will or in response to stimuli. Fibaro can use relays to turn your boiler on before you wake, ready for your morning shower, or to activate your ventilation system in response to rising humidity. Relay Switches allow the incorporation of a wide variety of electrical equipment into the Fibaro system. This model can switch a single device of up to 3KW load.