supply of earth fault relay type 9-22 er4-dt epr 11210630 operating coil 110 v dc material required for tower wagon. make:- inder or its exact equivalent. [ warranty period: 30 months after the date of de livery ] ] - earth fault relay type 9-22 er4-dt epr 11210630 operating coil 110 v dc material required for tower wagon. make:- inder or its exact equivalent.