RCD Test Instrument

Measuring instrument which checks the qualities of a FI switch.
It is all about the measuring of the contact voltage in particular, determing time and tripping current of RCD types A, AC, S and F.


  • Digital display, backlit color OLED display
  • LED for measurement point illumination
  • Patented means of securing the test probes
  • Compact and rugged – for service calls and laboratory use

Testing features

Testing of residual current devices (RCDs)

  • Measurement of touch voltage without tripping the RCCB.
    Contact voltage is measured with reference to nominal residual current using 1/3 of the nominal residual current value.
  • Tripping test with nom. residual current, time to trip measurement

Special tests for equipment and RCDs

  • Testing of equipment and RCDs with rising residual current including indication of tripping current
  • Testing of RCDs, IΔN = 10, 30, 100, 300 and 500 mA
  • Testing RCDs with 1/2 IΔN, 1 IΔN, 2 IΔN, 5 IΔN up 100 mA nominal current)
  • Testing RCDs with half-waves (pulsating direct current) for determining time to trip and tripping current

Testing of special RCDs

  • selective S, type AC, type A

Measurement of line voltage and fault loop impedance


  Article No: M507B
Icon Technical Data » D » GB » F » PL (pdf 152 kB)
Icon Operating Instructions » D » GB » F (pdf 412 kB)
Icon Operating Instructions » I » E » NL
Short-form Operating Instructions D-GB (pdf 249 kB)
Icon Pamphlet » GB » RU (pdf 1736 kB)