For example, an overcurrent relay might initiate a trip if the current on any phase exceeds a certain threshold whereas a set of differential relays might initiate a trip if the sum of currents between them indicates there may be current leaking to earth.
2.
It brakes electric engine circuit when the current gets over 600 A . Differential relay can serve for the protection purpose, in case of overthrows and fan-outs ( ? ) on the ground when the current does not rich 600 A . The overloading relay has no effect on disconnecting devices; it liquidates overloading in starting mode, by lowering switching conditions and adding the additional resistor in a circuit.
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