JRC 154 local breaker backup relay, is used to check
the operation of distribution end circuit breakers and to trip the
feeder end circuit breaker if the distribution end circuit breaker
fails to trip.
Principle of Operation:
If a fault occurs at the distribution end and the respective protective relay operates but the corresponding CB fails to operate then the system may have
to face catastrophic consequences. JRC-154 is a instantaneous and definite time over current relay that also monitors the non-potential contacts of the
downstream protective relays. The relay is designed to trip the feeder end CB if the protective relay at the distribution end operates but its corresponding CB fails