Minilec D2 EFR 1 Relays are Earth Fault monitoring relays. D2EFR1 relays can do fault detection on three phase electrical systems. Earth Fault monitoring relays are capable of monitoring the ungrounded power systems. Minilec D2 EFR1 relays are having following applications generator panels, AMF panels, MCC panel & motor control panels.
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https://www.electrikals.com/product/minilec-d2-efr-1-din-rail-mounted-earth-fault-monitoring-relay?id=25659
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