What is the Plug Setting Multiplier (PSM) of a relay having a pick-up current of 5 A, when used with a 400/5 current transformer, if the fault current in the circuit is 4000 A?

An over-current relay has a current setting of 150% and a time multiplier setting of 0.5. The relay is connected to a circuit through a Current Transformer (CT) with a ratio of 500 : 5 A. Calculate the Plug Setting Multiplier (PSM) if the circuit carries 6000 A of fault current.

An over-current relay has a current setting of 120%. What is its pick-up current if the rated secondary current of the current transformer is 5 A (given the transformer ratio is 100 and rated primary current is 500 A)?