6)Do & Don’ts

5. Do & Don’ts

a) Don’t replace slightly pitted contacts; contacts should be replaced only when 40% of silver tips is remaining.

b) Don’t file the contacts, don’t use emery paper on contacts it will reduce the life of contacts drastically
c) Don’t apply grease on contacts
d) Easily separable contacts can be reused according to IEC947
e) Do inspect the contact condition after short circuit & overload trip.
f) Don’t used broken/cracked & carbonized arc chamber it will cause flashover
g) Don’t replace the contacts after mechanical life of contactor is over.
(You can replace the contacts 7 times after that complete contactor has to be replaced