I am using BTA41 triac to operate 115V .75 HP motor. But as I switch on, the triac blows off. please let me know hw I can protect the same as I am alredy using a suitable snubber circuit.
RC snubber is for filtering voltage spikes, it won't do anything to limit in rush current.
What you need is a suitably sized choke in series of your triac
For example a toroid wound with wire.