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Old 05-23-2010, 03:46 AM   #1
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I have a 230V air-con unit in my boat, but the 12V coolant pump is on its own 12V switch and both need to be switched on seperately. If someone forgets to turn on the pump, I think the aircon unit could be damaged by running dry. How can I wire this so that turning on one system (eg the 12V pump switch) automatically turns on the other 230V circuit? I thought of using a relay, but I am not very electronically minded and would appreciate some advice with designing the circuit.
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Old 05-23-2010, 05:07 AM   #2
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Switches are not, generally speaking, rated by voltage, they are rated by current. So a switch that handles switching a 20A load at 12V will almost certainly handle switching a 2A load at 240V, and vice-versa. If you look around in most electronics shops you'll see a range of switches that are dual rated, 12V/20A or 12V/50A and 240V/10A.

Then all you need is one SPDT switch (single pole dual throw) that will switch your 12V circuit and your 240V circuit at the same time.
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Old 05-25-2010, 03:12 AM   #3
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Quote:
Originally Posted by delatbabel' date='23 May 2010 - 07:07 AM View Post

Switches are not, generally speaking, rated by voltage, they are rated by current. So a switch that handles switching a 20A load at 12V will almost certainly handle switching a 2A load at 240V, and vice-versa. If you look around in most electronics shops you'll see a range of switches that are dual rated, 12V/20A or 12V/50A and 240V/10A.

Then all you need is one SPDT switch (single pole dual throw) that will switch your 12V circuit and your 240V circuit at the same time.
Thanks, thats a great suggestion!
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