Differential Relays ELR20-30 / TYPE A

The differential relays ELR20-30 are designed for limitation of the earth leakage current of the type A.

Associated with a measure earth leakage transformer and circuit breaker they allow to perform on low voltage networks of the type TT, IT, TNS the following functions:

  • Protection from direct contacts
  • Complementary protection from indirect contacts
  • Limitation of the leak current
  • Protection from fires

    Their reinforced immunity and TRMS measurement technique guarantee maximum safety and continuity of the electrical operation, avoiding ill-time cuts.


  • Permanent display of the instant leak current
  • Display of the latching current
  • Programmable sensitiveness: 30 mA to 3 A
  • 2 alarm and pre-alarm relay outputs
  • Re-triggering cycle programmable (ELR30 Model)
  • Test and reset the alarms from the keyboard or via external command
  • Test of the connection with the earth leakage transformer
  • Galvanic isolation: 2KV
  • For DIN rail mounting
  • Power supply: 20 to 270 vac and 20 to 300 vdc

DATASHEET (pdf) | MANUAL (pdf) |

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