老鼠尾即係乜野? RCD or RCBO?

RCD...standard size is a pair of MCB size..
In the market.. lot of RCCB product is taken single MCB size. The four pole terminal.
it connect ..

RCCB. must be 4 terminal.in single phase..for monitoring the supply and load balancing:
therefore
1. Supply.. connect to busbar..same as MCB..
2. outgoing Live terminal.. same as MCB..
3. outgoing Neutral..terminate near item.2
4. supply neutral is call for your lead.(mouse cable)..
it connect to MCB board neutral main terminal..