A float switch is a device used to detect the level of liquid within a tank. The 

 

float switch may be used in a pump, an indicator, an alarm, or other devices. 

 

When used in a typical sump pump application, the float switch is used to turn an 

 

electric pump on and off. As water enters the reservoir of the sump pump, a plastic 

 

float begins to rise. The float switch is commonly fastened to a rigid structure at one 

 

end, thereby, causing the float to pivot or roll over as it sises on the water 

 

level. A micro switch inside of the float switch is connected to an electric pump 

 

by wiring that runs through the chassis of the pump. 

 

Once the proper angle is reached by the float, the ball inside runs to the low side 

 

of the switch and completes the circuit, allowing electricity to reach the pump 

 

motor and begin to pump the water out of the basement or structure. Once the water 

 

has been pumped out of the reservoir and the float reaches its resting level once 

 

again, the ball flows out of the switch and the contact is broken within the wiring 

 

harness, turning off the pump motor. In this design, the float switch is commonly 

 

housed in a copper, aluminum or tin float canister to prevent rust and 

 

deterioration in the submerged position.