GMC-I Messtechnik GmbH 21
7.3.4 Type G or R RCCBs
In addition to standard RCCBs and selective RCDs, the special
characteristics of the type G RCCB can also be tested with the
instrument.
The type G RCCB is an Austrian specialty and complies with the
ÖVE/ÖNORM E 8601 device standard. Erroneous tripping is
minimized thanks to its greater current carrying capacity and
short-term delay.
Select the Measuring Function
Set Parameters – Type G/R (VSK)
Contact voltage and time to trip can be measured in the
G/R-RCD selector switch position.
It must be observed that time to trip for type G RCCBs
may be as long as 1000 ms when measurement is made
at nominal residual current. Set the corresponding limit
value.
Ð Then select 5 x I
N
in the menu and repeat the tripping test
with the positive half-wave at 0° and the negative half-wave at
180°. The longer of the two tripping times is decisive regard-
ing the condition of the tested RCCB.
Set Parameters – Positive or Negative Half-Wave
Set Parameters – 5 Times Nominal Current
The following limitations apply when selecting X times
tripping current relative to nominal current:
300 mA: 1 x I
N
, 2 x I
N
500 mA: 1 x I
N
Start Measurement
In both cases, tripping time must be between 10 ms (minimum
delay time for type G RCCBs!) and 40 ms.
Type G RCCBs with other nominal residual current values must
be tested with the corresponding parameter setting under menu
item I
N
. In this case as well, the limit value must be appropriately
adjusted.
The parameter setting RCD for selective RCCBs is not
suitable for type G RCCBs.
Negative half-wave
Positive half-wave
Waveform:
Negative direct current
Positive direct current
X times tripping current:
5 times tripping current
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