Square D by Schneider Electric FSG2J20CP 20-40 PSI Pumptrol Water Pressure Switch

i want switch that switch on my 1hp water pump when pipelines water pressure increasing.not on when pressure is low

can this switch be adjusted to operate at 40 - 60 psi?

Pump max. HP rating?

Since the pressure is adjustable, why are there different pressure models like 20-40, 30-50...?