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A switch that initiates a current every 20 min

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Rexe

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Hi guys & gals.
I know 'nothing' about electronics.....That's a start.

I wish to rotate a display board in an arc over a period of approximately 10 hours.
My thoughts (I want yours) are that I need a switch to start a micro-motor that is connected to the display every 15/20 minutes. Can you identify such a switch for me? Given that it is an outdoor display, amperage is important.
More info: A basic spring loaded toggle switch (activated by a tag on the side of a cog) would break the current to the motor after the display has rotated the required amount. Then the switch in question would be required to start the motor again, and again every 15/20 mins.....Clear as mud, ok!
If you can help, that'd be fantastic.
 
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