3 phase contactor advice

[Darkwood]

Now we know a little bit more got to agree can be achieved with simple control circuit but still have lack of info as to how exactly the Hopper set up will work ie... auto-fill, level sensors etc and as the OP is a little out of his area i not sure he will be able to provide all the info we would require.

My advice is get a competent person in knowledge in these set-ups and also fluent in BS7671 - specifically section 705.