The model in the product catalogue/Lorch website is the M-Pro 250, which is a 3 Phase set. The 252 is a 230v single phase version designed specifically for the UK market
As Wyn says the M-Pro 252 is a single phase machine. The brochure you mean was printed before the 252 was launched, there is also a M-Pro 250, which is 250 amps 3-Phase.