Hi Prahlad,

Contactor is 220V AC. Snubber is 100R in series with 0.47u. across contactor coil.

previously i was using ds1232. that has not solved my problems. now iam not using anu supervisor at all.

my problems started when i switched to 3.3 micro. previously i was using RD2.

between the micro and opto couples there are 74HC245 2 nos and one 74HC574.

i am using micrel 5209 for 3.3V

Thanks for your reply

Haribabu