REF11 numerical relay offers single-phase, non-directional, Earth fault protection with one measuring element.

The relay can be used in following Low and Medium voltage applications.

1. Differential Protection of Generator
2. Restricted Earth Fault Protection of Generator or Transformer

REF11 with draw-out enclosure has a single CT measurement system for measuring current with 1% accuracy and offers instantaneous and definite time protection. REF11 provides protection for the measurement value of current.