Delay switch for head pump

[Phil23]

I want to install a time delay switch to control the length of time my head pump can be operated, grand kids and visitors think its fun to play with!!!
I have tried to procure a delay switch online however cannot find anything will handle more than a maximum of 10Amps and my pump draws 11.6 Amps at full flush. Any advise appreciated.

 

[bluebyu]

Wire timer with a relay