I don't normally call these wholesalers i just go in person, ....most make out the can't speak English on the phone , but strangely can when you turn up there ..... and can see your money!!! lol!!!
Depends, i had a 500mA front end RCCD originally, Now all changed to RCBOs. Seen a few 300mA over here too, but never a front end 30mA .... I would say 99% of all houses and villas here, have a 500mA front ender. Check when you back in May as to the exact value of your device. As i say, no matter what, you are going to be far better off converting your 10 way CU, ...Front enders are, ...and always have been a real pain in the rear!!! ..lol!!!