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Prok devices pvt ltd an iso 9001-2008 company introduces digital microprocessor micro controller based idmt definite time instantaneous earth fault relay (efr). It is a current sensing device which is semitropical professionally designed and tested for protection of generators, transformers and feeders. Prok dv's make digital microprocessor micro controller based idmt definite time instantaneous earth fault relay (efr) can be employed with various earth fault protective schemes