Protective device for a controlling system of a sewage pump

Abstract

A protective device for a controlling system of a sewage pump has a protective circuit to protect a start capacitor and to avoid the start capacitor from burnout when an overload is occurred by actuating power source (ON status) or when a transient voltage is occurred by malfunction of a controlling circuit. Therefore, the start capacitor is certainly protected and significantly improved in lifespan.

1 . A protective device for a controlling system of a sewage pump with a start capacitor and a run capacitor, the protective device comprising a protective circuit composed of a centrifugal switch adapted to mount on an output shaft of the sewage pump and providing a protective efficiency by cutting power to avoid the start capacitor in the sewage pump from burnout. 
   
   
       2 . The protective device as claimed in  claim 1 , wherein one end of the centrifugal switch is adapted to connect to the start capacitor in series connection;
 another end of the centrifugal switch is adapted to connect to the run capacitor in parallel connection;   wherein, the start capacitor and the run capacitor are operationally and respectively in parallel connection and are connected to an actuating coil and an operating coil at two ends of the parallel connection to achieve a combined circuit for the operation of the sewage pump.