RCCB CONNECTION

Maybe depends on the network?

Found this with my friend Google

http://www.schneider-electric.co.in/sites/india/en/support/faq/main_faq.page?page=content&country=IN&lang=EN&id=FA22608&redirect=true

its work i just practically done it but i want to know how its detecting the current variation in three phase

If no current flows in the neutral the RCD just ignores it. there's no real reason to connect it to the system.

Without knowing the appropriate level of dexterity, the tools and the manual skills available, it is impossible for the forum to make any form of assessment.

All joking aside, why not just install it in accordance with the equipment manufacturer's instructions?

Personally, i do not think it is good practice to have the sensing part downstream of the switching part. The way you have shown, any earth leakage will be sensed AFTER switching on, and only then will the RCCB trip. If the CBCT is UPSTREAM of the switching part, and if there is an earth leakage already, then the mechanism will not latch (being trip-free hopefully), so one cannot switch on the RCCB.

My opinion only, may not be right

The circuit protection device (in this case the circuit breaker) protects the load side equipment wiring therefore the sensing must be located downstream on the load side of the circut breaker.

The sensors are immediate to the circuit breaker wiring or they an integral part of the breaker and are not located at great distances downstream.

On most breakers the CT's are located immediately after the load interruption contact(s).

Musthafa's explanation is correct. The connection of RCCB as shown in schematic diagram is correct.The incoming side of RCCB i.e 1,3,5,7 you have to connect mains side R,Y,B (3 phase voltage ) and Neutral in 7, Outgoing i.e in 2,4,6,8 terminals Motor side R, Y,B and EMPTY. Neutral wire ( 7 terminal) opposite side terminal ( 8 terminal ) should be empty. If you connect neutral or Earth in outgoing side (8) RCCB wont work, it means you are bypassing RCCB.