Float Switch Water Level Controller For Tank Pump Sump Pump, Water Tank

A

float switch

is a

mechanical switch

that floats on top of a liquid surface. As the liquid level goes up or down, it moves vertically with the liquid level. Depending on the counterweight and

pre-set trigger

, the mechanical switch opens or closes allowing an electrical current through it to the connected device. Typically, this connected device either

stops

or starts the inflow of the liquid. A float switch consists of a hollow floating body and an internal switch, also called a sensor. The most common internal switch is a reed switch, so there is also a magnet inside the body. There are other types of internal switches, but the working principle that they open/close due to gravity and water level moving the float switch vertically up or down is the same. Therefore , the mechanical switch creates an open or closed electrical circuit.