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Product offer - Multifunctional relays for Power Engineering


Availability of individual protective functions depends on input and output circuit configuration. The following hardware versions of the analogue input configurations are available (up to three analogue inputs):

I1.A1 - three current inputs In = 1 A
I5.A5 - three current inputs In = 5 A
IS - three current sensor inputs
U1 - three voltage inputs Un = 100 V
U2 - three voltage inputs Un = 230 V
Io - current input 3Io and voltage input 3Uo

The A1, A5 current variants are equipped with a dedicated flash sensor input for arc protection.

Depending on the chosen version, the device may be equipped with 3 or 4 actuating relays. The details on the availability of functions in certain hardware variants are listed in Table 1 of the CATALOG CARD.

Protective function library

  • Overcurrent/undercurrent, four-stage (50/37)
  • Arc protection (required for the operation of the fourth stage of the overcurrent protection) (50A)
  • Negative sequence overcurrent, two-stage, (46)
  • Thermal overcurrent (49M)
  • Overvoltage/undervoltage, four-stage (59/27)
  • Negative sequence overvoltage, two-stage (47)
  • Voltage overfrequency/underfrequency, four-stage (81H/81L)
  • Earth-fault four-stage with stage setting as:
    • overcurrent zero-current, independent (50N)
    • overvoltage zero-voltage (59N)
    • overcurrent with voltage interlock (67N)
    • earth-fault directional (59N/67N)
    • earth-fault admittance, circular (21N)
    • earth-fault admittance, directional (0÷90), capacitative (21N)
  • External (62)

Template by Linelab.
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