Hi I only work it out to be 3 modules, 1 20amp MCB, 1 20 Amp Contactor and 1 3 amp MCB
Also found out from the manufacturer the contactor is rated to 2,000,000 cycles (24hrs x 60 mins = 1440 minutes a day, say it switched off and on every 10 minutes (unlikely) that would be 144 cycles a day...