How to co-ordinate circuit breakers trip for overload and short circuit?

[SparkyAus]

Can 50A B type circuit breaker be coordinated with upstream 50A C type circuit breaker to trip earlier on shorts and current overloads?

 

[Marvo]

Yes, a B-curve circuit breaker can be used upstream from a C-curve of similar current rating to provide some discrimination but it would only be very marginal and might not be suitable method if the load on the circuit is AC3 or higher ie inductive, load of a poor PF or a load involving start or inrush currents.