Top mounting displacer liquid level switches utilize a simple buoyancy principle and are suitable for simple or complex applications, such as high level alarm or control of multiple pumps and alarms. The liquid level movement changes the buoyancy force on a displacer suspended from a range spring. The force change on the spring causes it to expand or contract moving an attraction sleeve into or out of the field of the switch magnet, actuating the switch. It is ideal for foaming, surging, or agitated liquids, dirty liquids and storage vessel applications.