There are various types of bus couplers (for double bus system, single section bus system, etc.).
I know that bus coupler between two busbars is called cross bus coupler.
How are other bus couplers called, how do we divide them by type?
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A bus coupler is just a normal circuit breaker (and isolators), no matter where it's installed, or which busses it's connecting.
A "cross bus coupler" is just a bus coupler that happens to be connecting the two busses of a double-bus switchyard. It's not a different type of switchgear and shouldn't be classified as such.
Similar terms are: