Dear sir I can see K1 relay is connected in series to Closing coil, it means closing coil pick up faster than the K1 realy. I got a doubt that it it is so for the second puls from TNC the same will repeat i.e till the K1 relay pick up and break the circuit closing puls reaches the Y9. and further to this I would like to know if S1 aux contact of CB is used in series whti is the use of anti pumping. hope a early reply Regards AK.Khan Gov. of Dubai