Introduction: Auto Transfer Switch

Picture of Auto Transfer Switch

When power goes out in my home, this switch connects my

inverter to allow my sump pump to use inverted dc power automatically.


Relay k10p-11a15-120 (DPDT, 15A, 120VAC) JAMECO # 282247, $10.95

Deep plastic conduit box

Misc wire

Two male plugs

One female plug


ulisesguerrero (author)2017-10-17

Thank you! It was really useful to me. Its crazy how some companies sell equipment to do this simple task for 100+ usd...

eddevine (author)ulisesguerrero2017-10-18

Glad you can use, sometime just the simple things in life are the best

eddevine (author)2014-05-31

I'm not sure if Home Depot has, I got mine on line (see description in parts list)

tdaniel10 (author)2014-05-14

Hey man wondering where you got the relay from? Could I pick it up at home depot?

eddevine (author)2014-02-07

Thank you for your comments, there may be a lot of options here but this works for me

snakelips1 (author)2014-02-06 neither the box nor the "connectors" are water resistant. This device doesn't need to be. It should be placed above flood level.

Lectric Wizard (author)2014-02-06

Nice to see you used proper water-resistant box & connectors. Instructable could use more detail and or a schematic to make it clearer. I've used this many times at remote sites for backup power switching, works great. Even if you don't have a 110vac relay you can just use an ac adaptor to match your relay voltage.

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More by eddevine:Auto transfer switchSump pump alarmWireless Mailbox Alarm with Phone alert
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