Which term denotes Call on signal control relay?

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Multiple Choice

Which term denotes Call on signal control relay?

Explanation:
In signaling relay nomenclature, each function has a concise label used in diagrams and maintenance manuals. The Call on signal control relay is identified by the abbreviation Co, which directly stands for “Call on.” That makes Co the precise designation for this relay in practice, so it’s the best choice. The other labels correspond to different relays or functions and do not denote the call-on control relay.

In signaling relay nomenclature, each function has a concise label used in diagrams and maintenance manuals. The Call on signal control relay is identified by the abbreviation Co, which directly stands for “Call on.” That makes Co the precise designation for this relay in practice, so it’s the best choice. The other labels correspond to different relays or functions and do not denote the call-on control relay.

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