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

This is what I’m going to make myself

wouldn't it be easier to just spend the 30 pounds?

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.

I want to make a few off them to save money. The contacters are only only £4 and the rest of materials will come to £6.