relay contacts sticking when switching running capactor

[raman00084]

i am making a automatic water level controller, my motor is a single phase submersible motor it has a green push button with 2 no modules if i press the green button one no module will trigger a starting capacitor and another no module will trigger the contactor.
i am using 2 relays one for switching starting capacitor and another for switching contractor. when i give pulse signal from micro-controller to the 2 relays, the capacitor switching relay contacts gets sticking so that the circuit is not braked, so that the capacitor busts off. how can i avoid relay contacts sticking when switching starting capacitor kindly help.

regards
kalyan

 

[barry]

You obviously have arcing across the contacts. They are not "sticking", they are being welded together. You need to suppress the arc with a snubber. Look at this:

**broken link removed**

 

[FvM]

Primarly, use suitable relays/contactors rated for motor load ("AC3" rating in the dataheet).