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HDG   7020

Frequency relay

The HDG 7020 is a two level frequency relay whose characteristics of high precision, rapid operating time, wide setting ranges and the possibility of using each operating level either for over-frequency or under-frequency, make it suitable for use in a wide range of applications.
The HDD 7020 is supplied in a modular plug-in case type R2 which may be mounted either as a separate relay, flush or projection mounting, or as an alement in a standard 19" rack cradle.


  • Under [81<] and Over [81>] Frequency


  • Rated Frequency: 50 or 60 Hz
  • 2 tripping thresholds
  • Setting Range: from Fn-7Hz to Fn+5,7Hz with step of 0,05 Hz
  • 2 output units with 2 contacts (NO or NC)
  • Hand reset mechanical operation indicators on each output unit
  • Green Led for presence of auxiliary supply and input voltage


  Device Doc. Type Lang. Ref. Index
HDG 7020 Leaflet EN / FR FA860 A
HDG 7020 User Manual EN M.1785 B
HDG 7020 Connection/Definition Diagram -- 9887 G