A float switch is a device used to detect the level of liquid within a tank.. Due to the higher density of the liquid, the float switch floats on the liquid surface. The float switch is secured by means of its cable fastener at a level suitable for the given application. The switching process is triggered by the rocking movements of the sensor. Initiators and micro-switches are used as switching elements.

The float switch consists of a float body with a built-in switching element and a connection cable. The switching element switches when it crosses the horizontal position in either direction. The following mercury-free switching elements are available:

• Initiators
• Small operation balls with inductive position detection
• Micro-switches with operation ball

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