What type of contacter to use

Hi I’m an electricians mate so I can just buy a contacter and make a four way circuit myself just not sure which type to get as it’s says on contacters normally closed or normally open etc please note I’m using a grow plug timer so one plug will go in Mains and the other in the grow timer
 
Please note that I know the type I want it’s a 25 amp just not sure on the other options where it states below in picture
 

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hey unless you know what your doing electrically I wouldn't suggest you make your own. a normal timer and power strip will do fine
 
I'm not an electrician by any means but I thought a plug n grow (as in the brand) is a contact to relay timer?

I've a 40 amp maxibright timer it's a a grasslin contact timer wired through a relay.
 
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