These controllers are terrible! The earths don't stay connected as the separate earth terminal is not strong enough to successfully clamp the earth!, However things get worse when you terminate the Incoming and out going cables! The 5 Internal terminals are utter rubbish and NOT FIT FOR PURPOSE! .
They are way too small , Underrated and wont hold the 1.5 mm Immersion Heater flex that the were supposedly designed for! . I cant believe a company such as GREENWOOD( who make some excellent electrical equipment) would put they're name to rubbish like this!I,m trying to find a good point to mention but quite frankly there aren't any. Same yourself loads of trouble and don't even think about wasting your money on these units. I,m a time served Electrician , Not a hobbyist. Thanks for reading this .