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A relay is an electrically controlled switch. Electromechanical relays use an electromagnet to activate mechanical contacts, solid-state relays use semiconductor switches.

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Connecting a space heater through an Arduino-controlled relay

I'm considering connecting a space heater to a relay such as this: http://www.handsontec.com/dataspecs/2Ch-relay.pdf The goal is to control it remotely using a GSM data connection. … Is there any danger to the relay by connecting devices that draw >10A? Is there any danger to a space heater or other device from not being able to draw enough current? …
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