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I need to On/Off an air conditioner with arduino. I think Relays are not suitable to handling an A/C. So experts please help me.

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  • \$\begingroup\$ Why do you think relays are unsuitable? What kind of relays are you talking about? What kind of A/C are you talking about? \$\endgroup\$ – Wesley Lee Nov 25 '16 at 18:22
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    \$\begingroup\$ I'd prefer to break into the control circuits, rather than switching the AC supply - then you'd probably be switching lower voltage and current. \$\endgroup\$ – Peter Bennett Nov 25 '16 at 18:30
  • \$\begingroup\$ 2 ton split air conditioner. @wesley lee \$\endgroup\$ – kazim Nov 25 '16 at 18:35
  • \$\begingroup\$ WHY do you think you need (or want) to control high voltage/current? Does the system not have a low-voltage thermostat control built-in? \$\endgroup\$ – Richard Crowley Nov 25 '16 at 18:51
  • \$\begingroup\$ I am using an arduino uno. Do you suggest me any switching circuit to control a 1800 watt load? @Richard Crowley \$\endgroup\$ – kazim Nov 25 '16 at 19:00
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Use a relay. There are definitely relays that can handle switching typical air conditioners. Relays also provide isolation between the switching logic and the switched power, which is very useful when one side is line power.

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