Coupling network CN 60255-C /-D

IEC 60255-26

IEC 60255-26 defines essential requirements for the interference immunity and interference emission of measuring relays and protective devices with regard to permanent and transient conducted and radiated interference, including electrostatic interference.

Two coupling networks for common mode tests and differential mode tests are available for this purpose.

  • Coupling network for common mode tests: CN 60255-C
  • Coupling network for differential mode tests: CN 60255-D
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  • Serial resistance:
    CN 60255-C: 220 Ohm (± 5%*)
    CN 60255-D: 100 Ohm (± 5%*)
  • Serial capacitance:
    CN 60255-C: 0.47 μF (± 5%*)
    CN 60255-D: (class A) 0.1 μF (± 5%*), (class B): CN 60255-C 0.047 μF (± 5%*)
  • Maximum test voltage: 
    CN 60255-C: 300 V (± 10%)
    CN 60255-D: 150 V (± 10%)