'Shunt' is an archaic term, meaning 'in parallel with'. So a 'shunt coil' is connected 'in parallel' with... With what, of course, depends upon what sort of device you are talking about. For example the field coil of a d.c. shunt-connected motor has its field winding connected in parallel ('shunt') with the supply.
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a shunt coil needs external supply & tripping coil gets supply from itself.
shunt trip coil used to trip the breaker automatically or manually.
An ammeter's coil requires very little current for full-scale deflection (fsd). So, to measure a current above its fsd value, most of that current must be allowed to bypass the coil. This is achieved by placing a very low value shunt resistance in parallel with the coil ('shunt' is an archaic word for 'parallel').
A shunt trip diagram typically illustrates the electrical connections and components involved in a shunt trip circuit, which is used to remotely trip a circuit breaker. It includes elements like the circuit breaker, shunt trip coil, power source, and control switch. The diagram shows how the control switch activates the shunt trip coil, causing the breaker to open and interrupt the circuit. For a specific diagram, it's best to refer to technical manuals or manufacturer specifications.
A shunt trip breaker is installed like any other molded case breaker. The only difference is that it has an internal tripping coil that is usually connected to a C.T. The breaker is usually mounted in a MCC cabinet The top of the breaker is bolted to the MCC bus bars and the bottom of the breaker is connected to the load. The load conductors pass through the C.T.'s.