In the field of plumbing “in general” when talking about level switches, there is not much choice. You search the Internet and you find only one model. You go to the plumbing store and often find only one model of float level switch.
This happens because nobody knows where this device will be installed.
This buoy is supposed to be connected to a control panel that will provide it with a 24V low voltage current, as provided by the regulations, but 8 times out of ten it is used for a replacement or for an emergency, and it will not be connected to a control panel. . I can guarantee you that in 80% of cases the level switch is used, connected directly to the water pump.
Well, this only model that we find on the Internet or in the store, is not designed to be directly connected to the water pump, because in its data it says 10(4) which means 10A at startup and 4A when running, because the intensity of the The electric current of a single-phase water pump between 0.75kw (one horsepower) and 1.5kw (two horsepower) easily exceeds 4 Amps, so the contact of this unique model of level switch will not have a very long life…
The FAES TECHNO2 model has the internal contact 10(8) that is suitable for all types of single-phase pumps.
Another problem that level switches often have is that they work in closed environments with hot water, especially when it comes to sewage pumps. Well, I guarantee you that in 80% of cases, the “single model” is also installed in wastewater. This buoy ends up accumulating water inside it due to condensation, with the result of drifting and tripping the main current switch, and do you want to know what happens when the technician arrives and you explain the problem? The “technician” tells you that the water pump is bypassed, that you have to replace the pump with a new one or do the winding. No one controls the level switch, because no one imagines that the “buoy” can drift, and the few who know do not want to waste time replacing a buoy.
There are specific level switches for wastewater such as the Shuttle model
Or FAES Titanium.

In these specific level switches for wastewater, FAES places the electrical contact in a chamber that is doubly isolated from the water. When buying a level switch, whether you are a technician or a salesperson, Head Pumps recommends FAES, an Italian manufacturer of level switches for more than 30 years.